6,044 results match your criteria Memorias do Instituto Oswaldo Cruz[Journal]


ERRATUM: Occurrence, antifungal susceptibility, and virulence factors of opportunistic yeasts isolated from Brazilian beaches.

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Mem Inst Oswaldo Cruz 2019 ;114:e180566ER

[This corrects the article doi: 10.1590/0074-02760180566]. Read More

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http://dx.doi.org/10.1590/0074-02760180566ERDOI Listing
January 2019

Neutrophil CD64 expression levels in IGRA-positive individuals distinguish latent tuberculosis from active disease.

Mem Inst Oswaldo Cruz 2019 8;114:e180579. Epub 2019 Apr 8.

Universidade do Estado do Rio de Janeiro, Faculdade de Ciências Médicas, Laboratório de Imunopatologia, Rio de Janeiro, RJ, Brasil.

Background: CD64 (FcγR1) is a high-affinity receptor for monomeric IgG1 and IgG3. Circulating neutrophils express very low amounts of CD64 on their surface.

Objectives: Our primary aim was to investigate the utility of neutrophil CD64 surface expression as a biomarker of active pulmonary tuberculosis (TB). Read More

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http://dx.doi.org/10.1590/0074-02760180579DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6454854PMC
April 2019
1 Read

Nanoemulsion containing essential oil from Xylopia ochrantha Mart. produces molluscicidal effects against different species of Biomphalaria (Schistosoma hosts).

Mem Inst Oswaldo Cruz 2019 Apr 8;114:e180489. Epub 2019 Apr 8.

Universidade Federal Fluminense, Laboratório de Tecnologia de Produtos Naturais, Niterói, RJ, Brasil.

Background: This work describes a chemical study of the essential oil from leaves of Xylopia ochrantha, an endemic Annonaceae species from Brazil, and its activity against Biomphalaria species. Considering its poor solubility in aqueous medium, the essential oil was nanoemulsified to evaluate its action on controlling some mollusc species of genus Biomphalaria, snail hosts of Schistosoma mansoni that causes schistosomiasis, which mainly affects tropical and subtropical countries.

Objectives: The main aims of this work were to analyse the chemical composition of essential oil from X. Read More

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http://dx.doi.org/10.1590/0074-02760180489DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6454853PMC
April 2019
1 Read

Human sapovirus GI.2 and GI.3 from children with acute gastroenteritis in northern Brazil.

Mem Inst Oswaldo Cruz 2019 Apr 4;114:e180574. Epub 2019 Apr 4.

Universidade de São Paulo, Instituto de Medicina Tropical, São Paulo, SP, Brasil.

Human sapoviruses (HSaV) are considered important causative agents of acute gastroenteritis in humans worldwide. However, knowledge of the genetic characteristics of the whole genome of HSaV in Brazil is limited. Here we report the complete genome sequences of six HSaVs GI. Read More

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http://dx.doi.org/10.1590/0074-02760180574DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6452520PMC

Diagnosis of Schistosoma mansoni infections: what are the choices in Brazilian low-endemic areas?

Mem Inst Oswaldo Cruz 2019 Mar 28;114:e180478. Epub 2019 Mar 28.

Fundação Oswaldo Cruz-Fiocruz, Instituto René Rachou, Biologia do Schistosoma mansoni e sua interação com o hospedeiro, Belo Horizonte, MG, Brasil.

The population of Brazil is currently characterised by many individuals harbouring low-intensity Schistosoma mansoni infections. The Kato-Katz technique is the diagnostic method recommended by the World Health Organization (WHO) to assess these infections, but this method is not sensitive enough in the context of low egg excretion. In this regard, potential alternatives are being employed to overcome the limits of the Kato-Katz technique. Read More

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http://dx.doi.org/10.1590/0074-02760180478DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6440364PMC
March 2019
1 Read

Protein-protein interactions of the nicotinamide/nicotinate mononucleotide adenylyltransferase of Leishmania braziliensis.

Mem Inst Oswaldo Cruz 2019 Mar 21;114:e180506. Epub 2019 Mar 21.

Universidad Nacional de Colombia, Facultad de Ciencias, Laboratorio de Investigaciones Básicas en Bioquímica, Bogotá, Colombia.

Background: Nicotinamide adenine dinucleotide (NAD) plays a central role in energy metabolism and integrates cellular metabolism with signalling and gene expression. NAD biosynthesis depends on the enzyme nicotinamide/nicotinate mononucleotide adenylyltransferase (NMNAT; EC: 2.7. Read More

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http://dx.doi.org/10.1590/0074-02760180506DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6430020PMC

Evaluation of insecticide resistance in Aedes aegypti populations connected by roads and rivers: the case of Tocantins state in Brazil.

Mem Inst Oswaldo Cruz 2019 Mar 25;114:e180318. Epub 2019 Mar 25.

Fundação Oswaldo Cruz-Fiocruz, Instituto Oswaldo Cruz, Laboratório de Fisiologia e Controle de Artrópodes Vetores, Rio de Janeiro, RJ, Brasil.

Background: The longstanding application of insecticides for vector control without periodic monitoring of the population response to these chemicals can directly drive the selection of resistant populations of vector mosquitoes. Tocantins is the newest state of the Brazilian Federation. Despite a historically high number of dengue cases, studies and monitoring data concerning insecticide resistance in the state are lacking. Read More

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http://dx.doi.org/10.1590/0074-02760180318DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6434582PMC
March 2019
1 Read

Occurrence, antifungal susceptibility, and virulence factors of opportunistic yeasts isolated from Brazilian beaches.

Mem Inst Oswaldo Cruz 2019 03 14;114:e180566. Epub 2019 Mar 14.

Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Departamento de Microbiologia, Belo Horizonte, MG, Brasil.

Background: Opportunistic pathogenic yeast species are frequently associated with water habitats that have pollution sources of human or animal origin. Candida albicans has already been suggested as a faecal indicator microorganism for aquatic environments.

Objectives: The goal of this study was to investigate the occurrence of C. Read More

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http://dx.doi.org/10.1590/0074-02760180566DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6419412PMC

Molecular characterisation of the emerging measles virus from Roraima state, Brazil, 2018.

Mem Inst Oswaldo Cruz 2019 Mar 18;114:e180545. Epub 2019 Mar 18.

Fundação Oswaldo Cruz-Fiocruz, Instituto Leônidas e Maria Deane, Manaus, AM, Brasil.

Measles is a human infectious disease of global concern that is caused by the measles virus. In this study, we report the complete genome sequencing of one measles virus isolate, genotype D8, that was obtained directly from a urine sample in Boa Vista city, the capital of Roraima state in Brazil. Phylogenetic reconstruction grouped the genome described in this study with that of samples from Australia, South Korea, and Italy. Read More

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http://dx.doi.org/10.1590/0074-02760180545DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6423661PMC
March 2019
1 Read

A localized outbreak of Chikungunya virus in Salvador, Bahia, Brazil.

Mem Inst Oswaldo Cruz 2019 Feb 28;114:e180597. Epub 2019 Feb 28.

Fundação Oswaldo Cruz-Fiocruz, Instituto Gonçalo Moniz, Salvador, BA, Brasil.

A localized Chikungunya virus (CHIKV; East/Central/South African genotype) outbreak (50 cases, 70% laboratory-confirmed; attack rate: 5.3 confirmed cases/100 people) occurred in a Salvador, Brazil neighborhood, between Apr-Jun/2017. Highly clustered cases in space and time, mostly along a single street, highlight an increased risk of CHIKV transmission among pockets of susceptible populations. Read More

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http://dx.doi.org/10.1590/0074-02760180597DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6396974PMC
February 2019
1 Read

Immunogenicity and safety of the combined vaccine for measles, mumps, and rubella isolated or combined with the varicella component administered at 3-month intervals: randomised study.

Mem Inst Oswaldo Cruz 2019 Mar 7;114:e180517. Epub 2019 Mar 7.

Fundação Oswaldo Cruz-Fiocruz, Instituto de Tecnologia em Imunobiológicos, Bio-Manguinhos, Rio de Janeiro, RJ, Brasil.

Background: Field testing required to license the combined measles, mumps, and rubella (MMR) vaccine must take into account the current recommendation of the vaccine in Brazil: first dose at 12 months and second dose at 15 months of age in combination with a varicella vaccine.

Objectives: This study aimed to evaluate the clinical consistency, immunogenicity, and reactogenicity of three batches of MMR vaccine prepared with active pharmaceutical ingredients (API) from Bio-Manguinhos, Fiocruz (MMR-Bio), and compare it to a vaccine (MMR produced by GlaxoSmithKline) with different API.

Methods: This was a phase III, randomised, double-blind, non-inferiority study of the MMR-Bio administered in infants immunised at health care units in Pará, Brazil, from February 2015 to January 2016. Read More

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http://dx.doi.org/10.1590/0074-02760180517DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6404515PMC
March 2019
5 Reads

Brazilian malaria molecular targets (BraMMT): selected receptors for virtual high-throughput screening experiments.

Mem Inst Oswaldo Cruz 2019 Feb 25;114:e180465. Epub 2019 Feb 25.

Universidade Federal de São João Del-Rei, Divinópolis, MG, Brasil.

Background: Owing to increased spending on pharmaceuticals since 2010, discussions about rising costs for the development of new medical technologies have been focused on the pharmaceutical industry. Computational techniques have been developed to reduce costs associated with new drug development. Among these techniques, virtual high-throughput screening (vHTS) can contribute to the drug discovery process by providing tools to search for new drugs with the ability to bind a specific molecular target. Read More

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http://dx.doi.org/10.1590/0074-02760180465DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6388387PMC
February 2019
5 Reads

Detection and clearance of a mosquito densovirus contaminant from laboratory stocks of Zika virus.

Mem Inst Oswaldo Cruz 2019 Feb 7;114:e180432. Epub 2019 Feb 7.

Fundação Oswaldo Cruz-Fiocruz, Instituto Carlos Chagas, Laboratório de Virologia Molecular, Curitiba, PR, Brasil.

Background: The Zika virus (ZIKV) epidemics that affected South America in 2016 raised several research questions and prompted an increase in studies in the field. The transient and low viraemia observed in the course of ZIKV infection is a challenge for viral isolation from patient serum, which leads to many laboratories around the world sharing viral strains for their studies. C6/36 cells derived from Aedes albopictus larvae are commonly used for arbovirus isolation from clinical samples and for the preparation of viral stocks. Read More

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http://dx.doi.org/10.1590/0074-02760180432DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6369503PMC
February 2019
2 Reads

Tuberculosis-HIV treatment with rifampicin or rifabutin: are the outcomes different?

Mem Inst Oswaldo Cruz 2019 Feb 11;114:e180420. Epub 2019 Feb 11.

Fundação Oswaldo Cruz-Fiocruz, Instituto Nacional de Infectologia Evandro Chagas, Laboratório de Pesquisa Clínica em Micobactérias, Rio de Janeiro, RJ, Brasil.

Background: Rifamycins are a group of antibiotics mainly used in the treatment of tuberculosis (TB), however they interact with antiretroviral therapy (ART). Rifabutin allows more regimens options for concomitant imunodeficiency virus (HIV) treatment compared to rifampicin.

Objective: Compare the outcomes of TB-HIV co-infected patients who used rifampicin or rifabutin. Read More

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http://dx.doi.org/10.1590/0074-02760180420DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6372173PMC
February 2019
2 Reads

Lack of quadruple and quintuple mutant alleles associated with sulfadoxine-pyrimethamine resistance in Plasmodium vivax isolates from Brazilian endemic areas.

Mem Inst Oswaldo Cruz 2019 Feb 4;114:e180425. Epub 2019 Feb 4.

Fundação Oswaldo Cruz-Fiocruz, Instituto Oswaldo Cruz, Laboratório de Pesquisa em Malária, Rio de Janeiro, RJ, Brasil.

Background And Objective: Brazil is responsible for a large number of Plasmodium vivax cases in America. Given the emergence of P. vivax parasites resistant to chloroquine and the effectiveness of antifolates in vivax malaria treatment together with a correlation between mutations in P. Read More

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http://dx.doi.org/10.1590/0074-02760180425DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6364293PMC
February 2019
2 Reads

Evaluation of three recombinant proteins for the development of ELISA and immunochromatographic tests for visceral leishmaniasis serodiagnosis.

Mem Inst Oswaldo Cruz 2019 Feb 4;114:e180405. Epub 2019 Feb 4.

Universidade Federal de Minas Gerais, Faculdade de Farmácia, Belo Horizonte, MG, Brasil.

Background: Visceral Leishmaniasis (VL) is an infectious disease that is a significant cause of death among infants aged under 1 year and the elderly in Brazil. Serodiagnosis is a mainstay of VL elimination programs; however, it has significant limitations due to low accuracy.

Objective: This study aimed to evaluate three recombinant Leishmania infantum proteins (rFc, rC9, and rA2) selected from previous proteomics and genomics analyses to develop enzyme-linked immunosorbent assay (ELISA) and immunochromatographic tests (ICT) for the serodiagnosis of human VL (HVL) and canine VL (CVL). Read More

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http://dx.doi.org/10.1590/0074-02760180405DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6364332PMC
February 2019
4 Reads

Improving the reference standard for the diagnosis of canine visceral leishmaniasis: a challenge for current and future tests.

Mem Inst Oswaldo Cruz 2019 Jan 31;114:e180452. Epub 2019 Jan 31.

Universidade de Brasília, Núcleo de Medicina Tropical, Brasília, DF, Brasil.

Background: Studies aimed at validating canine visceral leishmaniasis diagnostic tests present heterogeneous results regarding test accuracy, partly due to divergences in reference standards used and different infection evolution periods in animals.

Objective: This study aimed to evaluate the accuracy of the rapid test-dual path platform (TR-DPP) (Biomanguinhos®), EIE-Leishmaniose-Visceral-Canina-Biomanguinhos (EIE-LVC) (Biomanguinhos®), enzyme-linked immunosorbent assay (ELISA) rK39 (in-house), and the direct agglutination test (DAT-Canis) against a reference standard comprising parasitological and molecular techniques.

Methods: A phase II/III validation study was carried out in sample sera from 123 predominantly asymptomatic dogs living in an area endemic for visceral leishmaniasis. Read More

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http://dx.doi.org/10.1590/0074-02760180452DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6358009PMC
January 2019
2 Reads

Drug development for cryptococcosis treatment: what can patents tell us?

Mem Inst Oswaldo Cruz 2019 Jan 31;114:e180391. Epub 2019 Jan 31.

Fundação Oswaldo Cruz-Fiocruz, Instituto Nacional de Ciência e Tecnologia de Gestão da Inovação em Doenças Negligenciadas, Centro de Desenvolvimento Tecnológico em Saúde, Rio de Janeiro, RJ, Brasil.

Background: Cryptococcosis is one of the most devastating fungal infections in humans. Despite the disease's clinical importance, current therapy is based on limited antifungals that are either toxic, inefficient, unavailable worldwide, or that quickly lead to resistance.

Objectives: The goal of this study was to provide insight into the future of cryptococcosis treatment by describing the patent scenario in this field. Read More

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http://dx.doi.org/10.1590/0074-02760180391DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6358010PMC
January 2019
1 Read

Analytical validation of real-time quantitative PCR assays for optimum diagnosis of vivax malaria.

Mem Inst Oswaldo Cruz 2019 Jan 31;114:e180350. Epub 2019 Jan 31.

Fundação Oswaldo Cruz-Fiocruz, Instituto Oswaldo Cruz, Laboratório de Pesquisa em Malária, Rio de Janeiro, RJ, Brasil.

Background: The prompt diagnosis of plasmodial species for effective treatment prevents worsening of individual health and avoids transmission maintenance or even malaria reintroduction in areas where Plasmodium does not exist. Polymerase chain reaction (PCR) allows for the detection of parasites below the threshold of microscopic examination.

Objective: Our aim was to develop a real-time PCR test to reduce diagnostic errors and increase efficacy. Read More

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http://dx.doi.org/10.1590/0074-02760180350DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6358008PMC
January 2019
2 Reads

First isolation of West Nile virus in Brazil.

Mem Inst Oswaldo Cruz 2019 Jan 17;114:e180332. Epub 2019 Jan 17.

Instituto Evandro Chagas, Seção de Arbovirologia e Febres Hemorrágicas, Ananindeua, PA, Brasil.

Background: Serological evidence of West Nile virus (WNV) infection has been reported in different regions of Brazil from equine and human hosts but the virus had never been isolated in the country.

Objectives: We sought to identify the viral etiology of equine encephalitis in Espírito Santo state.

Methods: We performed viral culture in C6/36 cells, molecular detection of WNV genome, histopathology and immunohistochemistry from horse cerebral tissue. Read More

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http://dx.doi.org/10.1590/0074-02760180332DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6343470PMC
January 2019
4 Reads

The cost of a disease targeted for elimination in Brazil: the case of schistosomiasis mansoni.

Mem Inst Oswaldo Cruz 2019 Jan 14;114:e180347. Epub 2019 Jan 14.

Universidade de Brasília, Núcleo de Medicina Tropical, Brasília, DF, Brasil.

Background: Schistosomiasis mansoni is a poverty-related parasitic infection that has a variety of clinical manifestations. We consider the disability and deaths caused by schistosomiasis unacceptable for a tool-ready disease. Its condition in Brazil warrants an analysis that will enable better understanding of the local health losses and contribute to the complex decision-making process. Read More

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http://dx.doi.org/10.1590/0074-02760180347DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6340134PMC
January 2019
3 Reads

Exploring tRNA gene cluster in archaea.

Mem Inst Oswaldo Cruz 2019 Jan 7;114:e180348. Epub 2019 Jan 7.

Fundação Oswaldo Cruz-Fiocruz, Instituto Oswaldo Cruz, Laboratório de Genética Molecular de Microrganismos, Rio de Janeiro, RJ, Brasil.

Background: Shared traits between prokaryotes and eukaryotes are helpful in the understanding of the tree of life evolution. In bacteria and eukaryotes, it has been shown a particular organisation of tRNA genes as clusters, but this trait has not been explored in the archaea domain.

Objective: Explore the occurrence of tRNA gene clusters in archaea. Read More

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http://dx.doi.org/10.1590/0074-02760180348DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6333295PMC
January 2019
3 Reads

Origin, tempo, and mode of the spread of DENV-4 Genotype IIB across the state of São Paulo, Brazil during the 2012-2013 outbreak.

Mem Inst Oswaldo Cruz 2019 Jan 7;114:e180251. Epub 2019 Jan 7.

Universidade de São Paulo, Instituto de Ciências Biomédicas, Departamento de Microbiologia, Laboratório de Evolução Molecular e Bioinformática, São Paulo, SP, Brasil.

Background: Dengue virus type 4 (DENV-4) was first reported in Brazil in 1982 and since then no more cases were detected again in Brazil until 2010, when the virus was reintroduced. Over the following years, the virus spread to several Brazilian states and resulted in about 1,400,000 dengue cases, in 2013. The largest number of cases were documented in the Southeast macro-region. Read More

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http://dx.doi.org/10.1590/0074-02760180251DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6333047PMC
January 2019
1 Read

Methylation of p16 ink4a promoter is independent of human papillomavirus DNA physical state: a comparison between cervical pre-neoplastic and neoplastic samples.

Mem Inst Oswaldo Cruz 2018 Dec 17;114:e180456. Epub 2018 Dec 17.

Universidade Federal Fluminense, Departamento de Microbiologia e Parasitologia, Niterói, RJ, Brasil.

BACKGROUND Epigenetic modifications in host cells, like p16 ink4a methylation, have been considered as putative complementary mechanisms for cancer development. Because only a small proportion of infected women develop cervical cancer, other factors might be involved in carcinogenesis, either independently or in association with high-risk human papillomavirus (HR-HPV) infections, including epigenetic factors. OBJECTIVES We hypothesised that p16 ink4a methylation might have a role in cancer development driven by HPV16, mainly in the presence of intact E1/E2 genes. Read More

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http://dx.doi.org/10.1590/0074-02760180456DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6319029PMC
December 2018
1 Read

Rodent-borne viruses survey in rural settlers from Central Brazil.

Mem Inst Oswaldo Cruz 2018 Dec 17;114:e180448. Epub 2018 Dec 17.

Fundação Oswaldo Cruz-Fiocruz, Instituto Oswaldo Cruz, Laboratório de Hantaviroses e Rickettsioses, Rio de Janeiro, RJ, Brasil.

Anthropogenic environmental changes arising from settlement and agriculture include deforestation and replacement of natural vegetation by crops providing opportunities for pathogen spillover from animals to humans. This study aimed to investigate the prevalence of rodent-borne virus infections in seven rural settlements from Midwestern Brazil. Of the 466 individuals tested 12 (2. Read More

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http://dx.doi.org/10.1590/0074-02760180448DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6319326PMC
December 2018
2 Reads

Characterisation of plasmid-mediated rmtB-1 in Enterobacteriaceae clinical isolates from São Paulo, Brazil.

Mem Inst Oswaldo Cruz 2018 Dec 10;113(12):e180392. Epub 2018 Dec 10.

Universidade Federal de São Paulo, Escola Paulista de Medicina, Departamento de Medicina Interna, Divisão de Doenças Infecciosas, Laboratório Alerta, São Paulo, SP, Brasil.

OBJECTIVES The emergence of 16S rRNA methyltranferases (16 RMTAses) has jeopardised the clinical use of aminoglycosides. RmtB is one of the most frequently reported in Gram-negatives worldwide. In this study, we aimed to estimate the frequency of 16S RMTAses encoding genes in Enterobacteriaceae isolated in a three-month period from a tertiary Brazilian hospital. Read More

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http://dx.doi.org/10.1590/0074-02760180392DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6287189PMC
December 2018
2 Reads

Polymorphisms in the TGFB1 and IL2RA genes are associated with clinical forms of leprosy in Brazilian population.

Mem Inst Oswaldo Cruz 2018 Dec 10;113(12):e180274. Epub 2018 Dec 10.

Instituto Lauro de Souza Lima, Bauru, SP, Brasil.

BACKGROUND Leprosy is a chronic infectious disease caused by Mycobacterium leprae, and compromises the skin and peripheral nerves. This disease has been classified as multibacillary (MB) or paucibacillary (PB) depending on the host immune response. Genetic epidemiology studies in leprosy have shown the influence of human genetic components on the disease outcomes. Read More

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http://dx.doi.org/10.1590/0074-02760180274DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6287188PMC
December 2018
4 Reads

Importance of cerebrospinal fluid investigation during dengue infection in Brazilian Amazonia Region.

Mem Inst Oswaldo Cruz 2018 Dec 10;114:e180450. Epub 2018 Dec 10.

Universidade Federal do Estado do Rio de Janeiro/Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil.

BACKGROUND Amazon, the largest tropical forest of the world, has suffered from dengue outbreaks since 1998. Cerebrospinal fluid (CSF) of patients, from Amazonas state, suspected of central nervous system (CNS) viral infection was studied using molecular and immunological methods. OBJECTIVE To evaluate the importance of CSF investigation in patients with acute dengue virus (DENV) infection of CNS. Read More

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http://dx.doi.org/10.1590/0074-02760180450DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6319028PMC
December 2018
3 Reads

Complete and de novo assembly of the Leishmania braziliensis (M2904) genome.

Mem Inst Oswaldo Cruz 2018 12 10;114:e180438. Epub 2018 Dec 10.

Universidad Autónoma de Madrid, Centro de Biología Molecular Severo Ochoa, Madrid, Spain.

Leishmania braziliensis is the etiological agent of American mucosal leishmaniasis, one of the most severe clinical forms of leishmaniasis. Here, we report the assembly of the L. braziliensis (M2904) genome into 35 continuous chromosomes. Read More

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http://dx.doi.org/10.1590/0074-02760180438DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6319030PMC
December 2018
14 Reads

Molecular typing reveals the co-existence of two transmission cycles of American cutaneous leishmaniasis in the Andean Region of Venezuela with Lutzomyia migonei as the vector.

Mem Inst Oswaldo Cruz 2018 Dec 6;113(12):e180323. Epub 2018 Dec 6.

Universidad de Carabobo, Facultad de Ciencias de la Salud, Centro Nacional de Referencia de Flebotomos y otros Vectores, Instituto de Investigaciones Biomédicas Dr Francisco J Triana-Alonso, Maracay, Venezuela.

BACKGROUND The transmission routes for American cutaneous leishmaniasis (ACL) are in flux, so studies examining its transmission in humans, mammalian hosts, and sand fly vectors are urgently needed. OBJECTIVES The aim of this work was understand the epidemiological cycles of Leishmania spp., which causes ACL in the Andean Region of Venezuela, by identifying the Leishmania and the sand fly species involved in human and dog infections. Read More

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http://dx.doi.org/10.1590/0074-02760180323DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6282108PMC
December 2018
8 Reads

Commercial drugs containing flavonoids are active in mice with malaria and in vitro against chloroquine-resistant Plasmodium falciparum.

Mem Inst Oswaldo Cruz 2018 Dec 6;113(12):e180279. Epub 2018 Dec 6.

Fundação Oswaldo Cruz-Fiocruz, Instituto René Rachou, Laboratório de Malária Experimental e Humana, Belo Horizonte, MG, Brasil.

BACKGROUND The main strategy to control human malaria still relies on specific drug treatment, limited now by Plasmodium falciparum-resistant parasites, including that against artemisinin derivatives. Despite the large number of active compounds described in the literature, few of them reached full development against human malaria. Drug repositioning is a fast and less expensive strategy for antimalarial drug discovery, because these compounds are already approved for human use. Read More

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http://dx.doi.org/10.1590/0074-02760180279DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6282106PMC
December 2018
1 Read

Ascorbate peroxidase overexpression protects Leishmania braziliensis against trivalent antimony effects.

Mem Inst Oswaldo Cruz 2018 11 14;113(12):e180377. Epub 2018 Nov 14.

Fundação Oswaldo Cruz-Fiocruz, Instituto René Rachou, Belo Horizonte, MG, Brasil.

Ascorbate peroxidase (APX) is a redox enzyme of the trypanothione pathway that converts hydrogen peroxide (H2O2) into water molecules. In the present study, the APX gene was overexpressed in Leishmania braziliensis to investigate its contribution to the trivalent antimony (SbIII)-resistance phenotype. Western blot results demonstrated that APX-overexpressing parasites had higher APX protein levels in comparison with the wild-type line (LbWTS). Read More

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http://dx.doi.org/10.1590/0074-02760180377DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6251480PMC
November 2018
2 Reads

Nyssorhynchus dunhami: bionomics and natural infection by Plasmodium falciparum and P. vivax in the Peruvian Amazon.

Mem Inst Oswaldo Cruz 2018 Dec 3;113(12):e180380. Epub 2018 Dec 3.

University at Albany, State University of New York, School of Public Health, Department of Biomedical Sciences, Albany, NY, USA.

BACKGROUND Nyssorhynchus dunhami, a member of the Nuneztovari Complex, has been collected in Brazil, Colombia, and Peru and described as zoophilic. Although to date Ny. dunhami has not been documented to be naturally infected by Plasmodium, it is frequently misidentified as other Oswaldoi subgroup species that are local or regional malaria vectors. Read More

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http://dx.doi.org/10.1590/0074-02760180380DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6276023PMC
December 2018
4 Reads

Novel variants of human herpesvirus 2 from Brazilian HIV-1 coinfected subjects.

Mem Inst Oswaldo Cruz 2018 Dec 3;113(12):e180328. Epub 2018 Dec 3.

Fundação Oswaldo Cruz-Fiocruz, Instituto Oswaldo Cruz, Laboratório de Virologia Molecular, Rio de Janeiro, RJ, Brasil.

BACKGROUND Human herpesvirus 2 (HHV-2) have DNA genome with a limited genetic variability and have been classified into two clades. OBJECTIVES To identify and characterise six HHV-2 isolates derived from Brazilian women. METHODS HHV-2 isolates were performed polymerase chain reaction (PCR) and sequencing of 2250 pb of the glycoprotein B (gB) coding regions. Read More

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http://dx.doi.org/10.1590/0074-02760180328DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6276022PMC
December 2018
3 Reads

Yellow fever outbreak in Brazil: the puzzle of rapid viral spread and challenges for immunisation.

Mem Inst Oswaldo Cruz 2018 Sep 3;113(10):e180278. Epub 2018 Sep 3.

Fundação Oswaldo Cruz-Fiocruz, Bio-Manguinhos, Rio de Janeiro, RJ, Brasil.

We discuss the complex eco-social factors involved in the puzzle of the unexpected rapid viral spread in the ongoing Brazilian yellow fever (YF) outbreak, which has increased the reurbanisation risk of a disease without urban cases in Brazil since 1942. Indeed, this rapid spatial viral dissemination to the Southeast and South regions, now circulating in the Atlantic Forest fragments close to peri-urban areas of the main Brazilian megalopolises (São Paulo and Rio de Janeiro) has led to an exponential increase in the number of yellow fever cases. In less than 18 months, 1,833 confirmed cases and 578 deaths were recorded most of them reported in the Southeast region (99,9%). Read More

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http://dx.doi.org/10.1590/0074-02760180278DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6135548PMC
September 2018
26 Reads

Multiplex TaqMan qPCR assay for specific identification of encapsulated Trichinella species prevalent in North America.

Mem Inst Oswaldo Cruz 2018 Oct 29;113(11):e180305. Epub 2018 Oct 29.

US Food and Drug Administration Center for Food Safety and Applied Nutrition, Office of Applied Nutrition and Safety Assessment, Laurel, MD, USA.

BACKGROUND Human trichinellosis is a foodborne parasitic zoonotic disease caused by ingestion of raw or undercooked meat infected with nematode larvae of the genus Trichinella. In the USA, sporadic cases and outbreaks caused by the consumption of wild game meat infected with Trichinella have been reported. The current methods for diagnosis such as serology and microscopy are not specific, may result in false negative results, and cannot differentiate encapsulated Trichinella larvae to species level. Read More

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http://dx.doi.org/10.1590/0074-02760180305DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6204614PMC
October 2018
26 Reads

Validation of the Dual-path Platform chromatographic immunoassay (DPP® CVL rapid test) for the serodiagnosis of canine visceral leishmaniasis.

Mem Inst Oswaldo Cruz 2018 11 1;113(11):e180260. Epub 2018 Nov 1.

Universidade do Estado do Rio de Janeiro, Instituto de Medicina Social, Departamento de Epidemiologia, Rio de Janeiro, RJ, Brasil.

BACKGROUND Visceral leishmaniasis is a major public health challenge in South America, and dogs are its main urban reservoir. OBJECTIVE Validation of the canine Dual-path Platform immunoassay for canine visceral leishmaniasis (DPP® CVL) for a sample set composed of 1446 dogs from different Brazilian endemic areas. METHODS A well-defined reference standard by means of parasitological culture, immunohistochemistry, and histopathology was used. Read More

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http://www.scielo.br/scielo.php?script=sci_arttext&pid=S
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http://dx.doi.org/10.1590/0074-02760180260DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6216333PMC
November 2018
9 Reads

Potential role of dengue virus, chikungunya virus and Zika virus in neurological diseases.

Mem Inst Oswaldo Cruz 2018 Oct 29;113(11):e170538. Epub 2018 Oct 29.

Instituto Evandro Chagas, Seção de Arbovirologia e Febres Hemorrágicas, Ananindeua, PA, Brasil.

This study showed that laboratory markers of recent infection by dengue, Zika or chikungunya arboviruses were detected in the biological samples of approximately one-third of patients with encephalitis, myelitis, encephalomyelitis or Guillain-Barré syndrome, in a surveillance programme in Piauí state, Brazil, between 2015-2016. Fever and myalgia had been associated with these cases. Since in non-tropical countries most infections or parainfectious diseases associated with the nervous system are attributed to herpesviruses, enteroviruses, and Campylobacter jejuni, the present findings indicate that in tropical countries, arboviruses may now play a more important role and reinforce the need for their surveillance and systematic investigation in the tropics. Read More

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http://dx.doi.org/10.1590/0074-02760170538DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6204615PMC
October 2018
39 Reads

Dengue 4 in Ceará, Brazil: characterisation of epidemiological and laboratorial aspects and causes of death during the first epidemic in the state.

Mem Inst Oswaldo Cruz 2018 Oct 18;113(11):e180320. Epub 2018 Oct 18.

Universidade Estadual do Ceará, Rede Nordeste de Biotecnologia, Fortaleza, CE, Brasil.

BACKGROUND The first dengue cases in Brazil with laboratory confirmation occurred in the northern region of the country, with the isolation of two serotypes, dengue virus 1 (DENV-1) and DENV-4. In Ceará, the introduction of DENV-4 was reported during a DENV-1 epidemic in 2011, with only two isolations. OBJECTIVES The aim of this study was to characterise the first DENV-4 epidemic in the state of Ceará, Brazil. Read More

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http://dx.doi.org/10.1590/0074-02760180320DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6193373PMC
October 2018
5 Reads

Use of domperidone in canine visceral leishmaniasis: gaps in veterinary knowledge and epidemiological implications.

Mem Inst Oswaldo Cruz 2018 Oct 18;113(11):e180301. Epub 2018 Oct 18.

Universidad Complutense de Madrid, Veterinary Faculty, Animal Health Department, Madrid, Spain.

A pivotal strategy to decrease the risk of visceral leishmaniasis in humans is to control the infection and disease progression in dogs, the domestic reservoir of Leishmania infantum (L. chagasi). Immunotherapy is a viable approach to treat sick dogs because cell-mediated immunity is the principal defense mechanism against L. Read More

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http://dx.doi.org/10.1590/0074-02760180301DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6193371PMC
October 2018
3 Reads

The β-blocker carvedilol and the benznidazole modulate the cardiac immune response in the acute infection induced by Colombian strain of the Trypanosoma cruzi.

Mem Inst Oswaldo Cruz 2018 Oct 18;113(11):e180271. Epub 2018 Oct 18.

Universidade Federal de Ouro Preto, Departamento de Ciências Biológicas, Ouro Preto, MG, Brasil.

BACKGROUND The infection led by Trypanosoma cruzi persists in mammalian tissues causing an inflammatory imbalance. Carvedilol (Cv), a non-selective beta blocker drug indicated to treat heart failure and antihypertensive has shown to promote antioxidant and immunomodulatory properties which might improve the inflammation induced by T. cruzi. Read More

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http://dx.doi.org/10.1590/0074-02760180271DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6193372PMC
October 2018
10 Reads

Gain of function in Mycobacterium bovis BCG Moreau due to loss of a transcriptional repressor.

Mem Inst Oswaldo Cruz 2018 Oct 11;113(11):e180267. Epub 2018 Oct 11.

Fundação Oswaldo Cruz-Fiocruz, Instituto Oswaldo Cruz, Laboratório de Genômica Funcional e Bioinformática, Rio de Janeiro, RJ, Brasil.

The Bacille Calmette-Guérin (BCG) vaccine comprises a family of genetically different strains derived by the loss of genomic regions (RDs) and other mutations. In BCG Moreau, loss of RD16 inactivates rv3405c * , encoding a transcriptional repressor that negatively regulates the expression of Rv3406, an alkyl sulfatase. To evaluate the impact of this loss on the BCG and host cell viability and the cytokine profile, THP-1 cells were infected with BCG Moreau (harbouring the empty vector) and a complemented strain carrying a functional copy of rv3405c. Read More

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http://www.scielo.br/scielo.php?script=sci_arttext&pid=S
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http://dx.doi.org/10.1590/0074-02760180267DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6180650PMC
October 2018
3 Reads

Ultrastructural viewpoints on the interaction events of Scedosporium apiospermum conidia with lung and macrophage cells.

Mem Inst Oswaldo Cruz 2018 Oct 8;113(10):e180311. Epub 2018 Oct 8.

Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde, Instituto de Microbiologia Paulo de Góes, Departamento de Microbiologia Geral, Laboratório de Estudos Avançados de Microrganismos Emergentes e Resistentes, Rio de Janeiro, RJ, Brasil.

Background: Scedosporium apiospermum is a ubiquitous, emerging and multidrug-resistant fungal pathogen with still rather unknown virulence mechanisms.

Objectives/methods: The cellular basis of the in vitro interaction between fungi and host cells/tissues is the determinant factor for the development of a successful in vivo infection. Herein, we evaluated the interaction of S. Read More

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http://www.scielo.br/scielo.php?script=sci_arttext&pid=S
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http://dx.doi.org/10.1590/0074-02760180311DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6174640PMC
October 2018
7 Reads

Protein mass spectrometry extends temporal blood meal detection over polymerase chain reaction in mouse-fed Chagas disease vectors.

Mem Inst Oswaldo Cruz 2018 Aug 27;113(10):e180160. Epub 2018 Aug 27.

University of Vermont, Department of Biology, Burlington, VT, United States of America.

Background: Chagas disease is highly prevalent in Latin America, and vector control is the most effective control strategy to date. We have previously shown that liquid chromatography tandem mass spectrometry (LC-MS/MS) is a valuable tool for identifying triatomine vector blood meals.

Objectives: The purpose of this study was to determine blood meal detection ability as a function of method [polymerase chain reaction (PCR) vs. Read More

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http://www.scielo.br/scielo.php?script=sci_arttext&pid=S
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http://dx.doi.org/10.1590/0074-02760180160DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6167943PMC
August 2018
2 Reads

Multiplex polymerase chain reaction as an improved method for screening Histoplasma capsulatum mating types.

Mem Inst Oswaldo Cruz 2018 17;113(10):e180340. Epub 2018 Sep 17.

Fundação Oswaldo Cruz-Fiocruz, Instituto Nacional de Infectologia Evandro Chagas, Laboratório de Micologia, Setor de Imunodiagnóstico, Rio de Janeiro, RJ, Brasil.

Histoplasmosis is a systemic mycosis infection caused by Histoplasma capsulatum, a heterothallic ascomycete. The sexual reproduction of this fungus is regulated by the mating type (MAT1) locus that contains MAT1-1 and MAT1-2 idiomorphs, which were identified by uniplex polymerase chain reaction (PCR). This study aimed to optimise single-step multiplex PCR for the accurate detection of the distinct mating types of H. Read More

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http://dx.doi.org/10.1590/0074-02760180340DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6140378PMC
October 2018
3 Reads

Comparative genomics reveals diverse capsular polysaccharide synthesis gene clusters in emerging Raoultella planticola.

Mem Inst Oswaldo Cruz 2018 Aug 27;113(10):e180192. Epub 2018 Aug 27.

Shu-Zen Junior College of Medicine and Management, Department of Nursing, Kaohsiung City, Taiwan.

Raoultella planticola is an emerging zoonotic pathogen that is associated with rare but life-threatening cases of bacteremia, biliary tract infections, and urinary tract infections. Moreover, increasing antimicrobial resistance in the organism poses a potential threat to public health. In spite of its importance as a human pathogen, the genome of R. Read More

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http://dx.doi.org/10.1590/0074-02760180192DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6135345PMC
August 2018
4 Reads

ERRATUM: "Malaria in Brazil: what happens outside the Amazonian endemic region".

Authors:

Mem Inst Oswaldo Cruz 2018 Aug 27;113(9):e140228ER. Epub 2018 Aug 27.

[This corrects the article doi: 10.1590/0074-0276140228]. Read More

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http://dx.doi.org/10.1590/0074-02760140228ERDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6122436PMC
August 2018
1 Read

Zika infection decreases Aedes aegypti locomotor activity but does not influence egg production or viability.

Mem Inst Oswaldo Cruz 2018 Aug 23;113(10):e180290. Epub 2018 Aug 23.

Fundação Oswaldo Cruz-Fiocruz, Instituto Oswaldo Cruz, Laboratório de Biologia Molecular de Insetos, Rio de Janeiro, RJ, Brasil.

Background: Zika has emerged as a new public health threat after the explosive epidemic in Brazil in 2015. It is an arbovirus transmitted mainly by Aedes aegypti mosquitoes. The knowledge of physiological, behavioural and biological features in virus-infected vectors may help the understanding of arbovirus transmission dynamics and elucidate their influence in vector capacity. Read More

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http://dx.doi.org/10.1590/0074-02760180290DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6107100PMC
August 2018
3 Reads

Prognostic value of serum brain-derived neurotrophic factor levels in patients with Chagas cardiomyopathy.

Mem Inst Oswaldo Cruz 2018 Aug 20;113(10):e180224. Epub 2018 Aug 20.

Universidade Federal de Minas Gerais, Departamento de Clínica Médica, Curso de Pós-Graduação em Infectologia e Medicina Tropical, Belo Horizonte, MG, Brasil.

Background: Serum brain-derived neurotrophic factor (BDNF) levels have been shown to be lower in patients with Chagas cardiomyopathy (ChC) than in patients with non-dilated chagasic cardiomyopathy. However, its prognostic value was not established in patients with ChC.

Methods: Forty-nine patients with ChC (50 ± 7 years, New York Heart Association "NYHA" I-III); were evaluated by echocardiography, exercise testing, and blood analysis. Read More

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http://dx.doi.org/10.1590/0074-02760180224DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6107101PMC
August 2018
20 Reads

Plasmodium falciparum parasites overexpressing farnesyl diphosphate synthase/geranylgeranyl diphosphate synthase are more resistant to risedronate.

Mem Inst Oswaldo Cruz 2018 13;113(10):e180174. Epub 2018 Aug 13.

Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, SP, Brazil.

Farnesyl diphosphate synthase/geranylgeranyl diphosphate synthase (FPPS/GGPPS) is a key enzyme in the synthesis of isoprenic chains. Risedronate, a bisphosphonate containing nitrogen (N-BP), is a potent inhibitor of blood stage Plasmodium. Here, we show that P. Read More

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http://dx.doi.org/10.1590/0074-02760180174DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6086031PMC
September 2018
2 Reads