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Sci Rep 2019 Feb 7;9(1):1630. Epub 2019 Feb 7.

National Institute of Public Health, National Reference Laboratory for Influenza, Prague, Czech Republic.

The ongoing evolution of microbial pathogens represents a significant issue in diagnostic PCR/qPCR. Many assays are burdened with false negativity due to mispriming and/or probe-binding failures. Therefore, PCR/qPCR assays used in the laboratory should be periodically re-assessed in silico on public sequences to evaluate the ability to detect actually circulating strains and to infer potentially escaping variants. Read More

Emerg Infect Dis 2019 Apr 17;25(4). Epub 2019 Apr 17.

The genetic diversity of influenza A viruses circulating in swine in Mexico complicates control efforts in animals and presents a threat to humans, as shown by influenza A(H1N1)pdm09 virus. To describe evolution of swine influenza A viruses in Mexico and evaluate strains for vaccine development, we sequenced the genomes of 59 viruses and performed antigenic cartography on strains from 5 regions. We found that genetic and antigenic diversity were particularly high in southeast Mexico because of repeated introductions of viruses from humans and swine in other regions in Mexico. Read More

Front Vet Sci 2018 22;5:347. Epub 2019 Jan 22.

Department of Population Health, University of Georgia, Athens, GA, United States.

A large diversity of influenza A viruses (IAV) within the H1N1/N2 and H3N2 subtypes circulates in pigs globally, with different lineages predominating in specific regions of the globe. A common characteristic of the ecology of IAV in swine in different regions is the periodic spillover of human seasonal viruses. Such human viruses resulted in sustained transmission in swine in several countries, leading to the establishment of novel IAV lineages in the swine host and contributing to the genetic and antigenic diversity of influenza observed in pigs. Read More

Zoonoses Public Health 2019 Mar 24;66(2):232-247. Epub 2019 Jan 24.

Department of Pathobiology, School of Veterinary Medicine, College of Health Sciences, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.

Influenza viruses are frequently transmitted between pigs and their handlers, and among pig handlers. However, reports on socio-environmental variables as potential risk factors associated with transmission of influenza in West African swine production facilities are very scarce. Syndromic survey for influenza was therefore conducted in Ibadan, Nigeria, and Kumasi, Ghana, in order to identify and elucidate selected socio-environmental variables that may contribute to the occurrence and distribution of influenza-like illness (ILI) among swine industry workers. Read More

J Family Med Prim Care 2018 Nov-Dec;7(6):1506-1509

Department of Respiratory Medicine, Pramukhswami Medical College, Karamsad, Anand, Gujarat, India.

Introduction: Influenza A (H1N1) virus has caused serious respiratory illness (swine flu) and death over the years. The first confirmed case of swine flu H1N1 in India was documented in May 2009, but huge numbers of cases were reported thereafter. In 2015, swine flu outbreak in India had led to significant morbidity and mortality. Read More

Virus Res 2018 Dec 31;263:34-46. Epub 2018 Dec 31.

Department of Microbiology, School of Preclinical Medicine, Guangxi Medical University, Nanning, 530021, China. Electronic address:

Although several miRNAs have been demonstrated to be involved in the influenza virus replication cycle, the identification of miRNAs and mRNAs that are expressed in A549 cells infected with influenza A viruses (IAVs) from different host species has remained poorly studied. To investigate the molecular mechanisms associated with the differential expression of miRNAs during influenza A virus infection, we performed global miRNA and mRNA expression profiling in A549 cells infected with human-origin seasonal influenza A virus H3N2 (Human_Br07), swine-origin influenza A virus H1N1 (SW_3861) or avian-origin influenza A virus H3N2 (AVI_9990). The miRNA and mRNA expression profiles were obtained by microarray and high-throughput sequencing analyses, respectively. Read More

Sci Rep 2018 Nov 30;8(1):17476. Epub 2018 Nov 30.

Emerging Infectious Diseases Programme, Duke-NUS Medical School, Singapore, Singapore.

As a leading global city with a high population density, Singapore is at risk for the introduction of novel biological threats. This risk has been recently reinforced by human epidemics in Singapore of SARS coronavirus, 2009 pandemic H1N1 influenza A virus, and enterovirus 71. Other major threats to Singapore include MERS-coronavirus and various avian and swine influenza viruses. Read More

Global Health 2018 11 27;14(1):117. Epub 2018 Nov 27.

Accident and Emergency Medicine Academic Unit, The Chinese University of Hong Kong, Trauma & Emergency Centre, Prince of Wales Hospital, Shatin, New Territories, Hong Kong.

Background: The global travel and tourism industry has been rapidly expanding in the past decades. The traditional focus on border screening, and by airline and cruise industries may be inadequate due to the incubation period of an infectious disease. This case study highlights the potential role of the hotel industry in epidemic preparedness and response. Read More

Int J Nanomedicine 2018 24;13:6699-6715. Epub 2018 Oct 24.

Food Animal Health Research Program, Ohio Agricultural Research and Development Center, Wooster, OH 44691, USA,

Background: Influenza (flu) is a constant threat to humans and animals, and vaccination is one of the most effective ways to mitigate the disease. Due to incomplete protection induced by current flu vaccines, development of novel flu vaccine candidates is warranted to achieve greater efficacy against constantly evolving flu viruses.

Methods: In the present study, we used liposome nanoparticle (<200 nm diameter)-based subunit flu vaccine containing ten encapsulated highly conserved B and T cell epitope peptides to induce protective immune response against a zoonotic swine influenza A virus (SwIAV) H1N1 challenge infection in a pig model. Read More

Front Immunol 2018 29;9:2455. Epub 2018 Oct 29.

Emory Vaccine Center, Emory University School of Medicine, Atlanta, GA, United States.

In 2009, the H1N1 swine flu pandemic highlighted the vulnerability of pregnant women to influenza viral infection. Pregnant women infected with influenza A virus were at increased risk of hospitalization and severe acute respiratory distress syndrome (ARDS), which is associated with high mortality, while their newborns had an increased risk of pre-term birth or low birth weight. Pregnant women have a unique immunological profile modulated by the sex hormones required to maintain pregnancy, namely progesterone and estrogens. Read More

MMWR Morb Mortal Wkly Rep 2018 Oct 26;67(42):1178-1185. Epub 2018 Oct 26.

During May 20-October 13, 2018,* low levels of influenza activity were reported in the United States, with a mix of influenza A and B viruses circulating. Seasonal influenza activity in the Southern Hemisphere was low overall, with influenza A(H1N1)pdm09 predominating in many regions. Antigenic testing of available influenza A and B viruses indicated that no significant antigenic drift in circulating viruses had emerged. Read More

Transplant Proc 2018 Oct 21;50(8):2291-2295. Epub 2018 Mar 21.

Surgery Service, Transplant Unit, Hospital Universitario Virgen de la Arrixaca, Murcia, Spain; Biomedical Research Institute of Murcia (IMIB-Arrixaca), University of Murcia, Murcia, Spain.

The pandemic influenza virus A (H1N1) in 2009, which was initially associated with pigs (swine flu), could have had a negative influence on attitudes toward xenotransplantation (XT), particularly after the social alarm it caused. The objective of this study was to analyze the impact of this pandemic on the acceptance of XT among veterinary science students.

Methods: A control group sample was taken of students registered in the veterinary degree course (academic year 2007-2008). Read More

PLoS One 2018 27;13(9):e0204776. Epub 2018 Sep 27.

Latvian Biomedical Research and Study Centre, Riga, Latvia.

Long alpha helix (LAH) from influenza virus hemagglutinin (HA) stem or stalk domain is one of the most conserved influenza virus antigens. Expression of N-terminally extended LAH in E. coli leads to assembly of α-h elical homotrimer which is structurally nearly identical to the corresponding region of post-fusion form of native HA. Read More

J Virol 2018 Dec 27;92(24). Epub 2018 Nov 27.

ANSES, Ploufragan-Plouzané Laboratory, Swine Virology Immunology Unit, BP53, Ploufragan, France

The H1N1 influenza virus responsible for the most recent pandemic in 2009 (H1N1pdm) has spread to swine populations worldwide while it replaced the previous seasonal H1N1 virus in humans. In France, surveillance of swine influenza A viruses in pig herds with respiratory outbreaks led to the detection of 44 H1N1pdm strains between 2009 and 2017, regardless of the season, and findings were not correlated with pig density. From these isolates, 17 whole-genome sequences were obtained, as were 6 additional hemagglutinin (HA)/neuraminidase (NA) sequences, in order to perform spatial and temporal analyses of genetic diversity and to compare evolutionary patterns of H1N1pdm in pigs to patterns for human strains. Read More

3 Biotech 2018 Oct 14;8(10):408. Epub 2018 Sep 14.

Regional Medical Research Centre, ICMR, N.E. Region, Post Box 105, Dibrugarh, Assam 786001 India.

Since its emergence in 2009, Influenza A/H1N1pdm09 virus has evolved continuously. Marked genetic variations have occurred in the HA1 domain of the hemagglutinin gene causing the emergence of new variants. The present study genetically characterized the hemagglutinin (HA) gene of Influenza A/H1N1pdm09 strains from Assam circulating in 2016 that caused a mild outbreak without any reported mortality. Read More

Microb Pathog 2018 Dec 8;125:72-83. Epub 2018 Sep 8.

Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Leninskie Gory 1-40, Moscow, 119991, Russia.

The aim of this study was to construct a vaccine peptide candidate against pandemic Influenza H1N1 hemagglutinin and to test its structure. With the help of bioinformatic algorithms we showed that the sequence encoding the second polypeptide of pandemic Influenza H1N1 hemagglutinin (HA2) is protected from nonsynonymous mutations better than the sequence encoding its first polypeptide (HA1). With the help of secondary and ternary structure predicting algorithms we found the fragment of HA2 with the most reproducible secondary structure and synthesized the NY25 peptide corresponding to the residues Asn117 - Tyr141 of HA2. Read More

J Virol 2018 Nov 29;92(22). Epub 2018 Oct 29.

Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA

Influenza A virus pandemics are rare events caused by novel viruses which have the ability to spread in susceptible human populations. With respect to H1 subtype viruses, swine H1N1 and H1N2 viruses occasionally cross the species barrier to cause human infection. Recently isolated from humans (termed variants), swine viruses were shown to display great genetic and antigenic diversity, hence posing considerable public health risk. Read More

Transbound Emerg Dis 2019 Jan 10;66(1):186-194. Epub 2018 Sep 10.

Departamento de Medicina y Zootecnia de Cerdos, FMVZ-UNAM, México City, CP, México.

Swine influenza is a worldwide disease, which causes damage to the respiratory system of pigs. The H1N1 and H3N2 subtypes circulate mainly in the swine population of Mexico. There is evidence that new subtypes of influenza virus have evolved genetically and have been rearranged with human viruses and from other species; therefore, the aim of our study was to identify and characterize the genetic changes that have been generated in the different subtypes of the swine influenza virus in Mexican pigs. Read More

Vet Microbiol 2018 Aug 6;222:75-84. Epub 2018 Jul 6.

Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, PR China; Shanghai Key Laboratory of Veterinary Biotechnology, Shanghai 200240, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, PR China. Electronic address:

Swine influenza A viruses (SIVs) causing outbreaks of acute, highly contagious respiratory disease in pigs also pose a potential threat to public health. European avian-like H1N1 (EA H1N1) SIVs are the predominant circulating viruses in pigs in China and also occasionally cause human infection. In this study, a high-growth reassortant virus (SH1/PR8), with HA and NA genes from a representative EA H1N1 isolate A/Swine/Shanghai/1/2014 (SH1) in China and six internal genes from the high-growth A/Puerto Rico/8/34 (PR8) virus, was generated by plasmid-based reverse genetics and tested as a candidate seed virus for the preparation of inactivated vaccine. Read More

Curr Infect Dis Rep 2018 Aug 1;20(10):38. Epub 2018 Aug 1.

Division of Infectious Diseases, Department of Paediatrics, The Hospital for Sick Children, Toronto, Ontario, Canada.

Purpose Of Review: Zoonotic influenza viruses are those influenza viruses that cross the animal-human barrier and can cause disease in humans, manifesting from minor respiratory illnesses to multiorgan dysfunction. The increasing incidence of infections caused by these viruses worldwide has necessitated focused attention to improve both diagnostic as well as treatment modalities. In this second part of a two-part review, we discuss the clinical features, diagnostic modalities, and treatment of zoonotic influenza, and provide an overview of prevention strategies. Read More

Curr Infect Dis Rep 2018 Aug 1;20(10):37. Epub 2018 Aug 1.

Public Health Ontario Laboratory, 661 University Avenue, Suite 1701, Toronto, ON, M5G 1M1, Canada.

Purpose Of Review: Zoonotic influenza viruses are those that cross the animal-human barrier and can cause disease in humans, manifesting from minor respiratory illnesses to multiorgan dysfunction. They have also been implicated in the causation of deadly pandemics in recent history. The increasing incidence of infections caused by these viruses worldwide has necessitated focused attention to improve both diagnostic as well as treatment modalities. Read More

Arch Virol 2018 Nov 31;163(11):3035-3049. Epub 2018 Jul 31.

Biomedical Research Center, Qatar University, 2713, Doha, Qatar.

The emergence of swine-origin pandemic H1N1 (pH1N1) in 2009 invigorated extensive surveillance programs worldwide which have resulted in the deposition of large numbers of H1N1 sequences to Genbank. In the present study, we report on global evolution and dynamics of the pandemic H1N1 influenza Hemagglutinin (HA) protein in viruses isolated from three different continents (North America, Europe and Asia) during the period between April 2009 until April 2017. Close to 2000 HA full protein sequences were downloaded from the Influenza Research Database of the NCBI and analyzed using DNAStar to run an alignment, the web-based NetNglyc to predict N-Glycosylation sites and finally, the BEAST software package to calculate evolution and substitution rates. Read More

Vaccine 2018 08 25;36(35):5325-5332. Epub 2018 Jul 25.

Seqirus, Inc. (formerly Novartis Influenza Vaccines), Cambridge, MA 02139, USA. Electronic address:

During the height of the 2009 H1N1 swine-derived influenza pandemic, a clinical trial was conducted in which seven subjects were immunized using a monovalent, MF59®-adjuvanted vaccine, developed from an egg-passaged candidate vaccine virus (CVV), A/California/07/2009 X-181. Whole blood was collected prior to immunization and at 8, 22, and 202 days post-vaccination, and subjects' serological responses were evaluated. Here, we reconstruct and examine the longitudinal, influenza-specific circulating B cell repertoire of one subject in that study. Read More

Vet Res 2018 07 27;49(1):73. Epub 2018 Jul 27.

Departamento de Medicina Preventiva Animal, Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santa Rosa, 11735, Santiago, Chile.

Novel H1N2 and H3N2 swine influenza A viruses (IAVs) were identified in commercial farms in Chile. These viruses contained H1, H3 and N2 sequences, genetically divergent from IAVs described worldwide, associated with pandemic internal genes. Guinea pigs were used as human surrogate to evaluate the infection dynamics of these reassortant viruses, compared with a pandemic H1N1 virus. Read More

J Virol 2018 10 12;92(19). Epub 2018 Sep 12.

Department of Microbiology and Immunology, University of Rochester, Rochester, New York, USA

In 2009, a pandemic H1N1 influenza A virus (IAV) (pH1N1) emerged in the human population from swine causing a pandemic. Importantly, this virus is still circulating in humans seasonally. To analyze the evolution of pH1N1 in humans, we sequenced viral genes encoding proteins inhibiting general gene expression (nonstructural protein 1 [NS1] and PA-X) from circulating seasonal viruses and compared them to the viruses isolated at the origin of the pandemic. Read More

Biomed Res Int 2018 29;2018:1096079. Epub 2018 May 29.

Institute of Animal Husbandry and Veterinary Medicine, Fujian Academy of Agriculture Sciences, Fujian Animal Disease Control Technology Development Center, Fuzhou, Fujian 350013, China.

We isolated an influenza strain named A/Swine/Fujian/F1/2010 (H1N2) from a pig suspected to be infected with swine flu. The results of electron microscopy, hemagglutination (HA) assay, hemagglutination inhibition (HI) assay, and whole genome sequencing analysis suggest that it was a reassortant virus of swine (H1N1 subtype), human (H3N2 subtype), and avian influenza viruses. To further study the genetic evolution of A/Swine/Fujian/F1/2010 (H1N2), we cloned its whole genome fragments using RT-PCR and performed phylogenetic analysis on the eight genes. Read More

Immunogenetics 2018 Jul 10. Epub 2018 Jul 10.

College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, 466001, People's Republic of China.

In vitro refolding assays can be used to investigate the affinity and stability of the binding of epitope peptides to major histocompatibility complex (MHC) class I molecules, which are key factors in the presentation of peptides to cytotoxic T lymphocytes (CTLs). The recognition of peptide epitopes by CTLs is crucial for protection against influenza A virus (IAV) infection. The peptide-binding motif of the swine SLA-3*hs0202 molecule has been previously reported and partly overlaps with the binding motif of the most abundant human MHC allele, HLA-A*0201. Read More

Emerg Microbes Infect 2018 Jul 2;7(1):123. Epub 2018 Jul 2.

WHO Collaborating Centre for Infectious Disease Epidemiology and Control, School of Public Health, The University of Hong Kong-Hong Kong Special Administrative Region, Hong Kong, China.

Swine are an important intermediate host for emergence of pandemic influenza. Vietnam is the largest swine producer in South East Asia. Systematic virological and serological surveillance of swine influenza viruses was carried out in Northern Vietnam from May 2013 to June 2014 with monthly sampling of pigs in local and large collective slaughterhouses and in a live pig market. Read More

Proc Natl Acad Sci U S A 2018 06 11;115(26):6822-6827. Epub 2018 Jun 11.

State Key Laboratory of Emerging Infectious Diseases, The University of Hong Kong, Hong Kong;

Novel reassortant avian influenza H7N9 virus and pandemic 2009 H1N1 (H1N1pdm) virus cause human infections, while avian H7N2 and swine H1N1 virus mainly infect birds and pigs, respectively. There is no robust in vitro model for assessing the infectivity of emerging viruses in humans. Based on a recently established method, we generated long-term expanding 3D human airway organoids which accommodate four types of airway epithelial cells: ciliated, goblet, club, and basal cells. Read More

J Virol 2018 08 31;92(16). Epub 2018 Jul 31.

Department of Microbiology, Biomedicine Discovery Institute, Monash University, Victoria, Australia

Global swine populations infected with influenza A viruses pose a persistent pandemic risk. With the exception of a few countries, our understanding of the genetic diversity of swine influenza viruses is limited, hampering control measures and pandemic risk assessment. Here we report the genomic characteristics and evolutionary history of influenza A viruses isolated in Australia from 2012 to 2016 from two geographically isolated swine populations in the states of Queensland and Western Australia. Read More

MBio 2018 06 5;9(3). Epub 2018 Jun 5.

Division of International Epidemiology and Population Studies, Fogarty International Center, National Institutes of Health, Bethesda, Maryland, USA.

The capacity of influenza A viruses (IAVs) to host jump from animal reservoir species to humans presents an ongoing pandemic threat. Birds and swine are considered major reservoirs of viral genetic diversity, whereas equines and canines have historically been restricted to one or two stable IAV lineages with no transmission to humans. Here, by sequencing the complete genomes of 16 IAVs obtained from canines in southern China (Guangxi Zhuang Autonomous Region [Guangxi]) in 2013 to 2015, we demonstrate that the evolution of canine influenza viruses (CIVs) in Asian dogs is increasingly complex, presenting a potential threat to humans. Read More

Viral Immunol 2018 Jul/Aug;31(6):457-469. Epub 2018 Jun 5.

1 Division of Basic Biomedical Sciences, Sanford School of Medicine, University of South Dakota , Vermillion, South Dakota.

Influenza virus infections can be complicated by bacterial superinfections, which are medically relevant because of a complex interaction between the host, the virus, and the bacteria. Studies to date have implicated several influenza virus genes, varied host immune responses, and bacterial virulence factors, however, the host-pathogen interactions that predict survival versus lethal outcomes remain undefined. Previous work by our group showed that certain influenza viruses could yield a survival phenotype (A/swine/Texas/4199-2/98-H3N2, TX98), whereas others were associated with a lethal phenotype (A/Puerto Rico/8/34-H1N1, PR8). Read More

Early Hum Dev 2018 07 24;122:1-7. Epub 2018 May 24.

Norwegian Institute of Public Health, P.O. Box 4404, Nydalen, 0403 Oslo, Norway. Electronic address:

Background: Studies investigating gestational influenza and child neurodevelopment are still scarce, particularly concerning timing of infection in pregnancy. This is the first study to investigate associations between gestational influenza and infant psychomotor development and temperament at 6 months.

Methods: Data from The Norwegian Influenza Pregnancy Cohort, established during the 2009 swine flu pandemic, were utilized. Read More

Virol Sin 2018 06;33(3):282-286

Fujian Provincial Center for Disease Control and Prevention, Fujian Provincial Key Laboratory of Zoonoses Research, Fuzhou, 350001, China.

Front Immunol 2018 2;9:934. Epub 2018 May 2.

Food Animal Health Research Program, Department of Veterinary Preventive Medicine, The Ohio State University, Wooster, OH, United States.

Annually, swine influenza A virus (SwIAV) causes severe economic loss to swine industry. Currently used inactivated SwIAV vaccines administered by intramuscular injection provide homologous protection, but limited heterologous protection against constantly evolving field viruses, attributable to the induction of inadequate levels of mucosal IgA and cellular immune responses in the respiratory tract. A novel vaccine delivery platform using mucoadhesive chitosan nanoparticles (CNPs) administered through intranasal (IN) route has the potential to elicit strong mucosal and systemic immune responses in pigs. Read More

Emerg Microbes Infect 2018 May 16;7(1):85. Epub 2018 May 16.

College of Animal Science and Technology, Guangxi University, No.100 Daxue Road, Nanning, 530004, China.

Considered a "mixing vessel" for influenza viruses, pigs can give rise to new influenza virus reassortants that can threaten humans. During our surveillance of pigs in Guangxi, China from 2013 to 2015, we isolated 11 H1N1 and three H3N2 influenza A viruses of swine origin (IAVs-S). Out of the 14, we detected ten novel triple-reassortant viruses, which contained surface genes (hemagglutinin and neuraminidase) from Eurasian avian-like (EA) H1N1 or seasonal human-like H3N2, matrix (M) genes from H1N1/2009 pandemic or EA H1N1, nonstructural (NS) genes from classical swine, and the remaining genes from H1N1/2009 pandemic. Read More

Emerg Microbes Infect 2018 May 16;7(1):87. Epub 2018 May 16.

Division of Infectious Diseases, School of Medicine, Global Health Institute, Duke University, Durham, NC, 27710, USA.

Pork production in China is rapidly increasing and swine production operations are expanding in size and number. However, the biosecurity measures necessary to prevent swine disease transmission, particularly influenza. viruses (IAV) that can be zoonotic, are often inadequate. Read More

Sci Rep 2018 May 10;8(1):7474. Epub 2018 May 10.

Influenza Division, National Center for Immunization & Respiratory Diseases, Centers for Disease Control & Prevention, Atlanta, GA, USA.

Specific residues of influenza A virus (IAV) PB1-F2 proteins may enhance inflammation or cytotoxicity. In a series of studies, we evaluated the function of these virulence-associated residues in the context of different IAV subtypes in mice. Here, we demonstrate that, as with the previously assessed pandemic 1968 (H3N2) IAV, PB1-F2 inflammatory residues increase the virulence of H1N1 IAV, suggesting that this effect might be a universal feature. Read More

Emerg Microbes Infect 2018 May 2;7(1):75. Epub 2018 May 2.

National Institute for Viral Disease Control and Prevention, Collaboration Innovation Center for Diagnosis and Treatment of Infectious Diseases, Chinese Center for Disease Control and Prevention, Key Laboratory for Medical Virology, National Health and Family Planning Commission, Beijing, 102206, China.

Eurasian avian-like H1N1 (EA H1N1) swine influenza viruses (SIVs) have become predominant in pig populations in China and have recently been reported to have the most potential to raise the next pandemic in humans. The mutation D701N in the PB2 protein, which accounts for 31% of H1N1 SIVs, has previously been shown to contribute to the adaptation of the highly pathogenic H5N1 or H7N7 avian influenza viruses in mammals. However, little is known of the effects of this substitution on the EA H1N1 viruses. Read More

Prev Vet Med 2018 May 6;153:24-29. Epub 2018 Mar 6.

The Ohio State University, Department of Veterinary Preventive Medicine, 1920 Coffey Road, Columbus, OH, 43201, USA. Electronic address:

Agricultural fairs facilitate an environment conducive to the spread of influenza A virus with large numbers of pigs from various different locales comingling for several days (5-8 days). Fairs are also associated with zoonotic transmission of influenza A virus as humans have unrestricted contact with potentially infected swine throughout the fair's duration. Since 2005, the Centers for Disease Control and Prevention has reported 468 cases of variant influenza A virus, with most cases having had exposure to swine at agricultural fairs. Read More

Viruses 2018 04 7;10(4). Epub 2018 Apr 7.

Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea.

Glycosylation of the hemagglutinin (HA) and neuraminidase (NA) of the influenza provides crucial means for immune evasion and viral fitness in a host population. However, the time-dependent dynamics of each glycosylation sites have not been addressed. We monitored the potential N-linked glycosylation (NLG) sites of over 10,000 HA and NA of H1N1 subtype isolated from human, avian, and swine species over the past century. Read More

Front Microbiol 2018 22;9:526. Epub 2018 Mar 22.

Institute of Medical Virology, Justus Liebig University Giessen, Giessen, Germany.

The 2009 pandemic influenza A virus (IAV) H1N1 strain (H1N1pdm09) has widely spread and is circulating in humans and swine together with other human and avian IAVs. This fact raises the concern that reassortment between H1N1pdm09 and co-circulating viruses might lead to an increase of H1N1pdm09 pathogenicity in different susceptible host species. Herein, we explored the potential of different NS segments to enhance the replication dynamics, pathogenicity and host range of H1N1pdm09 strain A/Giessen/06/09 (Gi-wt). Read More

Zoonoses Public Health 2018 08 30;65(5):528-539. Epub 2018 Mar 30.

Facultad de Salud Pública y Administración, Universidad Peruana Cayetano Heredia, Lima, Peru.

Interspecies transmission of pathogens is an unfrequent but naturally occurring event and human activities may favour opportunities not previously reported. Reassortment of zoonotic pathogens like influenza A virus can result from these activities. Recently, swine and birds have played a central role as "mixing vessels" for epidemic and pandemic events related to strains like H1N1 and H5N1. Read More

Ann Transplant 2018 Mar 30;23:218-223. Epub 2018 Mar 30.

First Department of Anesthesiology and Intensive Care, Medical University of Warsaw, Warsaw, Poland.

BACKGROUND In the general population, swine influenza is a self-limited infection. Patients after kidney transplantation, however, are at increased risk for complications and mortality from influenza A (H1N1). Acute respiratory distress syndrome (ARDS) complicates up to 55% of influenza-related pneumonia in hospitalized patients and carries a mortality of 40-46%. Read More

Virol J 2018 03 27;15(1):57. Epub 2018 Mar 27.

Department of Animal Infectious Disease, Institute of Animal Science & Veterinary Medicine, Shanghai Academy of Agricultural Science, No. 2901 Beidi Road, Minhang District, Shanghai, People's Republic of China.

Background: The influenza A virus non-structural protein 1 (NS1) is a multifunctional protein that plays an important role in virus replication, virulence and inhibition of the host antiviral immune response. In the avian influenza virus or human influenza virus, specific amino acids of NS1 have been shown to be important for the virus to antagonize host antiviral defenses and promote viral replication. However, little research has been reported regarding the swine influenza virus (SIV) NS1 protein. Read More

Cureus 2018 Jan 9;10(1):e2048. Epub 2018 Jan 9.

Department of Forensic Medicine and Toxicology, Dow University of Health Sciences (DUHS), Karachi, Pakistan.

Introduction Pakistan is extremely susceptible to an influenza outbreak, as it shares borders with the most affected countries, namely China and India. The medical and dental students come into direct contact with the affected population and should be aware of the risk factors and signs and symptoms pertaining to swine influenza virus (SIV). Hence, this survey was conducted to assess the knowledge, perceptions and self-care practices of the medical and dental students with regards to this pandemic. Read More

J Virol 2018 06 14;92(11). Epub 2018 May 14.

Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA

Influenza A(H1) viruses circulating in swine represent an emerging virus threat, as zoonotic infections occur sporadically following exposure to swine. A fatal infection caused by an H1N1 variant (H1N1v) virus was detected in a patient with reported exposure to swine and who presented with pneumonia, respiratory failure, and cardiac arrest. To understand the genetic and phenotypic characteristics of the virus, genome sequence analysis, antigenic characterization, and ferret pathogenesis and transmissibility experiments were performed. Read More

Transbound Emerg Dis 2018 Aug 6;65(4):1110-1116. Epub 2018 Mar 6.

Division of Transboundary Animal Disease, National Institute of Animal Health, NARO, Tsukuba, Japan.

Three subtypes-H1N1, H1N2 and H3N2-of influenza A viruses of swine (IAVs-S) are currently endemic in swine worldwide, but there is considerable genotypic diversity among each subtype and limited geographical distribution. Through IAVs-S monitoring in Vietnam, two H1N2 influenza A viruses were isolated from healthy pigs in Ba Ria-Vung Tau Province, Southern Vietnam, on 2 December 2016. BLAST and phylogenetic analyses revealed that their HA and NA genes were derived from those of European avian-like H1N2 IAVs-S that contained avian-origin H1 and human-like N2 genes, and were particularly closely related to those of IAVs-S circulating in the Netherlands, Germany or Denmark. Read More

Infect Genet Evol 2018 06 21;60:103-108. Epub 2018 Mar 21.

College of Veterinary Medicine, South China Agricultural University, Guangzhou, China; Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou, China. Electronic address:

Swine are the main host of the H1N1 swine influenza virus (SIV), however, H1N1 can also infect humans and occasionally cause serious respiratory disease. To trace the evolution of the SIV in Guangdong, China, we performed an epidemic investigation during the period of 2016-2017. Nine H1N1 influenza viruses were isolated from swine nasal swabs. Read More