3,140 results match your criteria Avian Pathology[Journal]


Oral immunization with an attenuated Gallinarum encoding the H9N2 hemagglutinin and M2 ectodomain induces protective immune responses against H9N2 infection in chickens.

Avian Pathol 2020 Jun 2:1-38. Epub 2020 Jun 2.

College of Veterinary Medicine, Jeonbuk National University, Iksan, 54596, Republic of Korea.

H9N2, a low pathogenic avian influenza (LPAI) virus, causes significant economic losses in the poultry industry worldwide. Herein, we describe the construction of an attenuated Gallinarum (SG) strain for expression and delivery of H9N2 hemagglutinin (HA) 1 (SG-HA1), HA2 (SG-HA2) and/or the conserved matrix protein 2 ectodomain (SG-M2e). We demonstrated that recombinant SG strains expressing HA1, HA2 and M2e antigens were immunogenic and safe in a chicken model. Read More

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http://dx.doi.org/10.1080/03079457.2020.1775782DOI Listing
June 2020
1.639 Impact Factor

Incidence and associated risk factors of necrotic enteritis in Belgian layer pullet flocks.

Avian Pathol 2020 May 22:1-24. Epub 2020 May 22.

Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.

Necrotic enteritis (NE) caused by is commonly reported in broilers. Recently, increased NE prevalence in layer breeds was reported in the Indian subcontinent. Also in Europe, NE is frequently observed by veterinary practitioners, mainly during the pullet rearing phase. Read More

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http://dx.doi.org/10.1080/03079457.2020.1772460DOI Listing

High phylogenetic diversity of is correlated with low biosecurity measures and management practice on poultry farms.

Avian Pathol 2020 May 7:1-28. Epub 2020 May 7.

Department of Poultry Diseases with Clinic, Faculty of Veterinary Medicine, University of Zagreb, Croatia.

is considered one of the most common bacterial causative agents of reproductive tract disorders in poultry. In this study, phylogenetic analysis of partial sequences and biotyping using MALDI-TOF MS was done in order to investigate the genetic diversity of isolates from thirteen farms with different biosecurity measures and management practices. Sampling was done as a part of regular monitoring, except for Farms 9-13 that were included in the study to represent extensive production system with lowest biosecurity levels. Read More

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http://dx.doi.org/10.1080/03079457.2020.1765970DOI Listing

Spotlight on avian coronaviruses.

Avian Pathol 2020 Jun 4:1-4. Epub 2020 Jun 4.

Huntingdon, UK.

Coronaviruses (CoVs) mainly cause enteric and/or respiratory signs. Mammalian CoVs including COVID-19 (now officially named SARS-CoV-2) belong to either the Alphacoronavirus or Betacoronavirus genera. In birds, the majority of the known CoVs belong to the Gammacoronavirus genus, whilst a small number are classified as Deltacoronaviruses. Read More

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http://dx.doi.org/10.1080/03079457.2020.1761010DOI Listing

A comparison of virulence genes, antimicrobial resistance profiles and genetic diversity of avian pathogenic (APEC) isolates from broilers and broiler breeders in Thailand and Australia.

Avian Pathol 2020 May 6:1-27. Epub 2020 May 6.

Avian Health Research Unit, Department of Veterinary Medicine, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand.

Avian pathogenic (APEC) is the causative agent of colibacillosis resulting in economic losses in the poultry industry worldwide. A total of 168 APEC isolates, equal numbers from Australian and Thai broilers/broiler breeders, were identified and tested for their susceptibility to ten antimicrobial agents. Most of the Thai APEC isolates were multidrug-resistant (MDR) (60. Read More

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http://dx.doi.org/10.1080/03079457.2020.1764493DOI Listing

Immunogenicity and Protective Efficacy of an EB66 Cell Culture-Derived Duck Tembusu Virus Vaccine.

Avian Pathol 2020 May 6:1-37. Epub 2020 May 6.

Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China.

The avian EB66 cell line derived from duck embryonic stem cells has been widely used for producing human and animal therapeutic proteins and vaccines. In current study we evaluated the potential use of EB66 cell line in a cell culture derived duck Tembusu virus (DTMUV) vaccine development. After optimizing the growth condition of DTMUV HB strain in EB66 cells, we successfully generated three batches of viruses with an ELD titer of 10/0. Read More

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http://dx.doi.org/10.1080/03079457.2020.1763914DOI Listing

Latency characteristics in specific pathogen-free chickens 21 and 35 days after intra-tracheal inoculation with vaccine or field strains of infectious laryngotracheitis virus.

Avian Pathol 2020 Jun 2:1-11. Epub 2020 Jun 2.

Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, The University of Melbourne, Parkville, Australia.

Latency is an important feature of infectious laryngotracheitis virus (ILTV) yet is poorly understood. This study aimed to compare latency characteristics of vaccine (SA2) and field (CL9) strains of ILTV, establish an reactivation system and examine ILTV infection in peripheral blood mononuclear cells (PBMC) in specific pathogen-free chickens. Birds were inoculated with SA2 or CL9 ILTV and then bled and culled at 21 or 35 days post-inoculation (dpi). Read More

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http://dx.doi.org/10.1080/03079457.2020.1754331DOI Listing

Synergistic effect of a combination of nicarbazin and monensin against coccidiosis in the chicken caused by spp.

Avian Pathol 2020 May 18:1-5. Epub 2020 May 18.

Huvepharma N.V., Antwerp, Belgium.

A clinical study was made into the abilities of nicarbazin and monensin and a nicarbazin + monensin combination to control , , and in chickens. When included in the feed, at concentrations of 40 ppm nicarbazin or 40 ppm monensin, these products showed partial efficacy evaluated by daily weight gain (DWG) but no activity judged by daily feed intake (DFI) or feed conversion ratio (FCR). By contrast, the combination of 40 ppm nicarbazin + 40 ppm monensin provided complete control of infection judged by greater DWG and DFI, and lower FCR. Read More

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http://dx.doi.org/10.1080/03079457.2020.1756226DOI Listing

Neuropathogenicity of newly isolated avian leukosis viruses from chickens with osteopetrosis and mesenchymal neoplasms.

Avian Pathol 2020 May 18:1-8. Epub 2020 May 18.

Laboratory of Veterinary Pathology, Co-department of Veterinary Medicine, Iwate University, Morioka, Japan.

The prototype fowl glioma-inducing virus (FGVp) causes fowl glioma and cerebellar hypoplasia in chickens. In this study, we investigated whether a strain of avian leukosis virus (ALV), associated with avian osteopetrosis and mesenchymal neoplasms, is able to induce fowl glioma. We encountered avian osteopetrosis and mesenchymal neoplasms, including myxosarcoma and rhabdomyosarcoma, in Japanese native chickens used for both egg-laying and meat production. Read More

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http://dx.doi.org/10.1080/03079457.2020.1757621DOI Listing

Ocular exposure to infectious laryngotracheitis virus alters leukocyte subsets in the head-associated lymphoid tissues and trachea of 6-week-old White Leghorn chickens.

Avian Pathol 2020 May 19:1-14. Epub 2020 May 19.

Department of Veterinary Biosciences and Diagnostic Imaging, College of Veterinary Medicine, University of Georgia, Athens, GA, USA.

Infectious laryngotracheitis virus (ILTV), an alphaherpesvirus, causes acute respiratory disease primarily infecting the upper respiratory tract and conjunctiva. Administration of live attenuated ILTV vaccines via eye drop, drinking water, or by coarse spray elicits protective mucosal immunity in the head-associated lymphoid tissues (HALT), of which conjunctiva-associated lymphoid tissue (CALT) and the Harderian gland (HG) are important tissue components. The trachea, a non-lymphoid tissue, also receives significant influx of inflammatory cells that dictate the outcome of ILTV infection. Read More

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http://dx.doi.org/10.1080/03079457.2020.1757036DOI Listing

Pathophysiology and pathological remodelling associated with dilated cardiomyopathy in broiler chickens predisposed to heart pump failure.

Avian Pathol 2020 May 22:1-12. Epub 2020 May 22.

Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, Canada.

Broiler chickens selected for rapid growth are highly susceptible to dilated cardiomyopathy (DCM). In order to elucidate the pathophysiology of DCM, the present study examines the fundamental features of pathological remodelling associated with DCM in broiler chickens using light microscopy, transmission electron microscopy (TEM), and synchrotron Fourier Transform Infrared (FTIR) micro-spectroscopy. The morphological features and FTIR spectra of the left ventricular myocardium were compared among broiler chickens affected by DCM with clinical signs of heart pump failure, apparently normal fast-growing broiler chickens showing signs of subclinical DCM (high risk of heart failure), slow-growing broiler chickens (low risk of heart failure) and Leghorn chickens (resistant to heart failure, used here as physiological reference). Read More

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http://dx.doi.org/10.1080/03079457.2020.1757620DOI Listing

Molecular and Pathological investigation of a natural outbreak of Newcastle Disease caused by genotype XVII in white leghorn chickens.

Avian Pathol 2020 Apr 17:1-27. Epub 2020 Apr 17.

Central Diagnostic Laboratory, National Veterinary Research Institute, P.M.B 1 Vom, Plateau State, Nigeria.

Newcastle disease (ND) is an infectious viral poultry disease with great economic consequences. In developing countries, outbreaks of ND caused by virulent NDV have been identified as limiting factor to the growth of the poultry industry. Limited reports exist on the pathology of natural field infection caused by NDV genotype XVII in chickens. Read More

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http://dx.doi.org/10.1080/03079457.2020.1757035DOI Listing

Development of an in-house ELISA for detection of antibodies against in Pekin ducks.

Avian Pathol 2020 May 18:1-6. Epub 2020 May 18.

Clinic for Poultry, University of Veterinary Medicine Hannover, Hannover, Germany.

(EC) is known to cause skeletal lesions in broiler chickens and also systemic infections in Pekin ducks. Despite the importance of the pathogen, there is still a lack of serological diagnostic tools for the detection of EC infections. Here we describe the development of an in-house indirect enzyme-linked immunosorbent assay (ELISA) for the detection of EC-specific antibodies and its application by examination of 67 sera from experimentally infected Pekin ducks, 710 field samples from four Pekin duck breeder flocks previously vaccinated with inactivated vaccines, and 80 samples from commercial Pekin ducks coming from vaccinated parent flocks. Read More

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http://dx.doi.org/10.1080/03079457.2020.1753653DOI Listing

Active virological surveillance in backyard ducks in Bangladesh: detection of avian influenza and gammacoronaviruses.

Avian Pathol 2020 May 18:1-8. Epub 2020 May 18.

Reference Laboratory for Avian Influenza (NRL-AI), Institute of Diagnostic Virology, Friedrich-Loeffler-Institute, Federal Research Institute for Animal Health, Greifswald-Insel Riems, Germany.

Domestic waterfowl play an important role in the perpetuation and transmission of avian pathogens including avian influenza viruses (AIV) of low and high pathogenicity, which pose severe economic and public health concerns in Bangladesh. This study focused on active surveillance of several avian viral pathogens with a special reference to AIV in selected backyard duck populations in Bangladesh. A total of 500 pooled oropharyngeal and cloacal samples from individual ducks of four districts were tested by real time PCRs for the presence of AIV, avian avulavirus-1, anatid herpesvirus-1, avian parvovirus, avian bornavirus and avian coronavirus. Read More

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http://dx.doi.org/10.1080/03079457.2020.1753654DOI Listing

New PA/1220/98-like variant of infectious bronchitis virus in Poland.

Avian Pathol 2020 May 18:1-9. Epub 2020 May 18.

Department of Poultry Diseases, National Veterinary Research Institute, Puławy, Poland.

The aim of the present study was to report the first detection of a new infectious bronchitis virus (IBV) variant in Polish commercial flocks which is completely different to any previously known in this region. In 2018, samples from Ross 308 breeding hens aged 35 weeks were delivered for IBV diagnosis. IBV presence was detected, but all attempts to amplify the S gene fragment were negative. Read More

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http://dx.doi.org/10.1080/03079457.2020.1754332DOI Listing

Differential house finch leukocyte profiles during experimental infection with isolates of varying virulence.

Avian Pathol 2020 May 18:1-13. Epub 2020 May 18.

Department of Biological Sciences, Virginia Tech, Blacksburg, VA, USA.

Leukocyte differentials are a useful tool for assessing systemic immunological changes during pathogen infections, particularly for non-model species. To date, no study has explored how experimental infection with a common bacterial pathogen, (MG), influences the course and strength of haematological changes in the natural songbird host, house finches. Here we experimentally inoculated house finches with MG isolates known to vary in virulence, and quantified the proportions of circulating leukocytes over the entirety of infection. Read More

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http://dx.doi.org/10.1080/03079457.2020.1753652DOI Listing

Protection following simultaneous vaccination with three or four different attenuated live vaccine types against infectious bronchitis virus.

Avian Pathol 2020 Apr 30:1-7. Epub 2020 Apr 30.

Department of Population Health, Poultry Diagnostic and Research Center, University of Georgia, Athens, GA USA.

Two or more different live attenuated infectious bronchitis virus (IBV) vaccine types are often given to broilers to induce homologous protection as well as to broaden protection against other IBV types in the field. However, the ability of broilers to respond to three or four different antigenic types of IBV vaccine has not been examined experimentally. In this study, we vaccinated one-day-old broiler chicks by eyedrop with three or four different IBV vaccine types simultaneously. Read More

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http://dx.doi.org/10.1080/03079457.2020.1748173DOI Listing

Spotlight on avian pathology: untangling contradictory disease descriptions of necrotic enteritis and necro-haemorrhagic enteritis in broilers.

Avian Pathol 2020 Apr 20:1-5. Epub 2020 Apr 20.

Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.

Necrotic enteritis (NE) is one of the most detrimental infectious diseases in the modern poultry industry, characterized by necrosis in the small intestine. It is commonly accepted that NetB-producing type G strains are responsible for the disease. However, based on both macroscopic and histopathological observations, two distinct types of NE are observed. Read More

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http://dx.doi.org/10.1080/03079457.2020.1747593DOI Listing

Identification of a common conserved neutralizing linear B-cell epitope in the VP3 protein of waterfowl parvoviruses.

Avian Pathol 2020 Jun 2:1-10. Epub 2020 Jun 2.

Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian, People's Republic of China.

Waterfowl parvoviruses (WPVs) including goose parvovirus (GPV), novel GPV-related virus (NGPV) and Muscovy duck parvovirus (MDPV) cause significant economic losses and epizootic threat to the waterfowl industries, and little is known about the B-cell epitopes of WPVs. In this study, a monoclonal antibody (mAb) 5B5 against the VP3 protein of NGPV was used to identify the possible epitope in the three kinds of WPVs. The mAb 5B5 had neutralizing activities to the three viruses, and reacted with the conserved linear B-cell epitopes of LHNPPP in VP3 protein of GPV, NGPV and MDPV. Read More

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http://dx.doi.org/10.1080/03079457.2020.1746743DOI Listing

Development of mismatch amplification mutation assay for the rapid differentiation of K vaccine strain from field isolates.

Avian Pathol 2020 Apr 3:1-8. Epub 2020 Apr 3.

Institute for Veterinary Medical Research, Centre for Agricultural Research, Budapest, Hungary.

causes respiratory diseases and reproduction disorders in turkeys and chickens. The infection has considerable economic impact due to reduced meat and egg production. Because elimination programmes are not feasible in a large number of poultry farms, vaccination remains the only effective measure of disease control. Read More

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http://dx.doi.org/10.1080/03079457.2020.1744523DOI Listing

Outbreak of avian mycobacteriosis in a commercial turkey breeder flock.

Avian Pathol 2020 Jun;49(3):296-304

Department of Pathology and Epidemiology, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Mashhad, Iran.

Avian mycobacteriosis (AM) is a chronic and contagious disease of pet birds, captive exotic, wild and domestic fowl, and mammals subsp. is the most common cause of AM in poultry. For the first time, we report a chronic outbreak of AM in an Iranian breeder flock of 250 45-week-old turkeys () with a morbidity and mortality rate of 91. Read More

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http://dx.doi.org/10.1080/03079457.2020.1740167DOI Listing
June 2020
1.639 Impact Factor

Major difference in clinical outcome and replication of a H3N1 avian influenza strain in young pullets and adult layers.

Avian Pathol 2020 Jun 12;49(3):286-295. Epub 2020 Mar 12.

Royal GD, Deventer, The Netherlands.

In this study, we investigated the pathogenicity, replication and tropism of the low pathogenic avian influenza (LPAI) strain A/chicken/Belgium/460/2019(H3N1) in adult SPF layers and young SPF males. The inoculated hens showed 58% mortality and a 100% drop in egg production in the second week post inoculation. The high viral loads in the cloacal samples coincided with the period of the positive immunohistochemistry of the oviduct, acute peritonitis and time of mortality, suggesting that the replication of H3N1 in the oviduct was a major component of the onset of clinical disease and increased level of excretion of the virus. Read More

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http://dx.doi.org/10.1080/03079457.2020.1731423DOI Listing

Avian coxiellosis in nine psittacine birds, one black-browed barbet, and one paradise tanager.

Avian Pathol 2020 Jun 12;49(3):268-274. Epub 2020 Mar 12.

Northwest ZooPath, Monroe, WA, USA.

Infection with a novel species of the genus was first described in three Swainson's blue mountain rainbow lorikeets from a zoological collection, and days later in a group of seven other psittacine birds and a toucan. We provide an update on coxiellosis in nine additional psittacines, and two non-psittacines. Psittacines originated in New England, the mid Atlantic, the Midwest, the South, and the Northwest. Read More

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http://dx.doi.org/10.1080/03079457.2020.1729956DOI Listing

Complementation of the MS-H vaccine strain with wild-type influences its growth characteristics.

Avian Pathol 2020 Jun 10;49(3):275-285. Epub 2020 Mar 10.

Asia Pacific Centre for Animal Health, Melbourne Veterinary School, Faculty of Veterinary & Agricultural Sciences, The University of Melbourne, Werribee, Australia.

The (MS) vaccine strain MS-H harbours a frameshift mutation in (oligopeptide permease transporter) which results in expression of a truncated OppF. The effect of this mutation on growth and attenuation of the MS-H is unknown. In this study, the impact of the mutation on the vaccine phenotype was investigated by introducing a wild-type copy of gene in the MS-H genome. Read More

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http://dx.doi.org/10.1080/03079457.2020.1729957DOI Listing
June 2020
1.639 Impact Factor

Pathogenicity of H5 highly pathogenic avian influenza virus in rooks ().

Avian Pathol 2020 Jun 21;49(3):261-267. Epub 2020 Feb 21.

Avian Zoonosis Research Center, Faculty of Agriculture, Tottori University, Tottori, Japan.

Rooks () are considered migratory crows in Japan. Some rooks share a wintering site in the Izumi plain in Kagoshima Prefecture with hooded cranes () and white-necked cranes (), which are designated as "endangered" in the International Union for Conservation of Nature (IUCN) Red List of Threatened Species. Highly pathogenic avian influenza (HPAI), caused by H5 subtype viruses, has recently been reported in these crane species in Japan, in conjunction with a massive decrease in their population. Read More

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http://dx.doi.org/10.1080/03079457.2020.1724876DOI Listing

Histologically validated scoring system for the assessment of hock burn in broilers.

Avian Pathol 2020 Jun 23;49(3):230-242. Epub 2020 Jan 23.

Department of Veterinary Sciences, Chair of Animal Welfare, Ethology, Animal Hygiene and Animal Husbandry, Faculty of Veterinary Medicine, LMU Munich, Munich, Germany.

The assessment of bird-based welfare indicators plays an important role in the evaluation of bird welfare. The aim of the study was to histologically validate a visual scoring system for hock burn in broilers and to detect threshold values of a visual score to define welfare-relevant alterations in terms of mild lesions or ulcers of the hock. We collected 200 hocks of 39- to 42-day-old Ross 308 broilers after the slaughter process. Read More

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http://dx.doi.org/10.1080/03079457.2020.1712328DOI Listing

Evaluation of 3-week-old layer chicks intratracheally challenged with isolates from serogroup c1 (O:6,7) and Enteritidis.

Avian Pathol 2020 Jun 11;49(3):305-310. Epub 2020 Feb 11.

Department of Veterinary Clinical Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka, Japan.

With the exception to serotype Typhimurium and Enteritidis (serogroups B [O:4] and D [O:9], respectively), there have been very few studies conducted on the respiratory tract as route of infection in chickens with salmonellas from serogroup C1 (O:6,7) Therefore, the purpose of this present study was to determine the potential organ invasion by serotype Potsdam (SP), Mbandaka (SM), and Infantis (SI) from serogroup C1 (O:6,7) and compare their characteristics with those of Enteritidis (SE) on intratracheally (IT) challenged 3-week-old layer chicks. A total of 360 one-day-old White Leghorn layer chicks were acquired from a commercial hatchery and randomly assigned into four treatment groups (SP, SM, SI, and SE, respectively), consisting of three independent trials. Chicks were grown up to 21 days (3 weeks) and IT-challenged thereafter with 10 CFU of respective salmonella organisms per group ( = 30). Read More

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http://dx.doi.org/10.1080/03079457.2020.1719280DOI Listing

Characterization of infectious bronchitis virus D181, a new serotype (GII-2).

Avian Pathol 2020 Jun 7;49(3):243-250. Epub 2020 Feb 7.

GD Animal Health, Deventer, The Netherlands.

This paper describes the characterization of a new infectious bronchitis virus (IBV) strain D181, that rapidly evolved from a low-level incidental finding in 2017 to become the second most isolated IBV strain in Dutch layers and breeders in 2018, as well as being found in samples from Germany and Belgium. Based on the sequence of the S gene and the results of cross-neutralization tests, D181 can be considered as a new serotype and the second lineage within genotype II (GII-2). The experimental infection of SPF hens confirmed the ability of D181 to cause a drop in egg production, and immunohistochemistry showed presence of the virus in the trachea, lung and conjunctiva at 5 days post inoculation and in the caecal tonsils at 5 and 8 days post inoculation. Read More

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http://dx.doi.org/10.1080/03079457.2020.1713987DOI Listing

Feed-borne exacerbates respiratory distress in chickens infected with by inducing haemorrhagic pneumonia.

Avian Pathol 2020 Jun 12;49(3):251-260. Epub 2020 Mar 12.

College of Life Science and Engineering, Foshan University, Foshan, People's Republic of China.

is an important zoonotic pathogen and its oral route of infection plays an important role in the transmission and persistence. strain, a common contaminant of animal feed and feedstuffs, can cause severe diarrhoea and malnutrition in poultry. In our previous study, a strain (Dawu C), isolated from the haemorrhagic lungs of infected chickens, was shown to harbour two virulence genes () and was able to induce haemorrhagic lesions in the lungs, as well as gizzard erosion and ulceration (GEU) syndrome in broilers. Read More

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http://dx.doi.org/10.1080/03079457.2020.1716940DOI Listing

Protection against fowl cholera in ducks immunized with a combination vaccine containing live attenuated duck enteritis virus and recombinant outer membrane protein H of .

Avian Pathol 2020 Jun 22;49(3):221-229. Epub 2020 Jan 22.

Department of Veterinary Biosciences and Public Health, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai, Thailand.

Fowl cholera is a highly contagious disease within the global duck farming industry. This study aimed at formulating and evaluating the protective efficacy of a combination vaccine containing a recombinant outer membrane protein H (rOmpH) of strain X-73 with a live attenuated duck plague vaccine into a single dose. Four groups of ducks received different treatments and the groups were labelled as non-vaccinated, combined vaccination, duck plague vaccination and rOmpH vaccination, respectively. Read More

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http://dx.doi.org/10.1080/03079457.2019.1711020DOI Listing

A study on risk factors for macroscopic gut abnormalities in intensively reared broiler chickens.

Avian Pathol 2020 Apr 29;49(2):193-201. Epub 2020 Jan 29.

Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.

Intensification of broiler production has coincided with an increase in enteric disorders. Enteric syndromes of unknown aetiology are often associated with an increased feed conversion ratio and are given the general term "dysbiosis". Despite the importance of dysbiosis, information on factors contributing to this condition are scarce. Read More

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http://dx.doi.org/10.1080/03079457.2019.1711019DOI Listing

Effect of IBV D1466 on egg production and egg quality and the effect of heterologous priming to increase the efficacy of an inactivated IBV vaccine.

Avian Pathol 2020 Apr 27;49(2):185-192. Epub 2020 Jan 27.

MSD Animal Health, Boxmeer, The Netherlands.

To protect layers, breeders and grandparents against damage by infectious bronchitis virus infections during the laying period, vaccination using live priming followed by a boost with inactivated IB vaccine is commonly used. For many IB variants, homologous live vaccines are not available for priming. Very little is known about the efficacy of priming with heterologous live IB vaccines (or combination of live IB vaccines) to induce broad IB protection in long-living chickens. Read More

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http://dx.doi.org/10.1080/03079457.2019.1710462DOI Listing

Rate of false positive reactions in 11 and serological tests in samples obtained from SPF birds inoculated with heterologous mycoplasma species.

Avian Pathol 2020 Apr 9;49(2):179-184. Epub 2020 Jan 9.

GD Animal Health, Deventer, the Netherlands.

No recent information is available on the specificity of current (Ms) and (Mg) serological tests. In this study the performance of a currently available Mg and Ms Rapid Plate Agglutination (RPA) test, and three Mg, three Ms and three Mg/Ms combination ELISAs were evaluated on SPF sera that were obtained from days (D) 0-28 after , or inoculation, after sham inoculation and without inoculation. Tracheal swabs for mycoplasma culture were obtained before inoculation (D0), 7 and 28 days post inoculation (d. Read More

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http://dx.doi.org/10.1080/03079457.2019.1702148DOI Listing

The transcriptional regulator PhoP mediates the molecular mechanism on APEC biofilm formation and pathogenicity.

Avian Pathol 2020 Jun 4;49(3):211-220. Epub 2020 Mar 4.

Anhui Province Key Laboratory of Veterinary and Disease Control, College of Animal Science and Technology, Anhui Agricultural University, Hefei, People's Republic of China.

As a transcriptional regulator of the classical binary regulatory system, PhoP plays an important role in the life activities of avian pathogenic (APEC). In previous experiments, we found that the absence of affects APEC biofilm formation and pathogenicity. To further explore the molecular mechanism of regulation of these phenomena, the differentially expressed gene was screened based on -derived transcriptional data, and the specific sequence identity of the PhoP binding sequence was predicted by bioinformatics and verified by electrophoretic mobility shift assay (EMSA). Read More

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http://dx.doi.org/10.1080/03079457.2019.1701182DOI Listing

Abnormal expression of liver autophagy and apoptosis-related mRNA in fatty liver haemorrhagic syndrome and improvement function of resveratrol in laying hens.

Avian Pathol 2020 Apr 7;49(2):171-178. Epub 2020 Jan 7.

Jiangxi Provincial Key Laboratory for Animal Health, Institute of Animal Population Health, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, People's Republic of China.

Fatty liver haemorrhagic syndrome (FLHS) is characterized by hepatic rupture and haemorrhage leading to sudden death in laying hens. Resveratrol (Res) is a natural polyphenol with antioxidant and anti-inflammatory effects that can ameliorate chronic liver disease. The aim of this study was to investigate the improved effect of Res on the altered expression of autophagy and apoptosis-related genes in laying hens with FLHS. Read More

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http://dx.doi.org/10.1080/03079457.2019.1698712DOI Listing

Spotlight on avian pathology: aspergillosis.

Avian Pathol 2020 Apr 10;49(2):115-118. Epub 2019 Dec 10.

Poultry Diagnostic and Research Center, Department of Population Health, University of Georgia, Athens, GA, USA.

Aspergillosis is a disease of domestic and free-living birds caused by infection with a fraction of fungi within the genus . Species can be identified by colony morphology and microscopic characterization of conidia and conidiophores or by PCR, and isolates can be typed by microsatellite typing. Serodiagnostic options for testing are limited to antibody and antigen detection methods. Read More

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http://dx.doi.org/10.1080/03079457.2019.1696946DOI Listing
April 2020
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Analysis of antibody response to an epitope in the haemagglutinin subunit 2 of avian influenza virus H5N1 for differentiation of infected and vaccinated chickens.

Avian Pathol 2020 Apr 10;49(2):161-170. Epub 2019 Dec 10.

Asia Pacific Centre for Animal Health, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Werribee, Australia.

The H5N1 subtype of highly pathogenic avian influenza virus has been circulating in poultry in Indonesia since 2003 and vaccination has been used as a strategy to eradicate the disease. However, monitoring of vaccinated poultry flocks for H5N1 infection by serological means has been difficult, as vaccine antibodies are not readily distinguishable from those induced by field viruses. Therefore, a test that differentiates infected and vaccinated animals (DIVA) would be essential. Read More

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http://dx.doi.org/10.1080/03079457.2019.1694635DOI Listing

Genotypic divergence of isolates with different growth requirements for nicotinamide adenine dinucleotide.

Avian Pathol 2020 Apr 27;49(2):153-160. Epub 2019 Nov 27.

College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea.

In 2017, for the first time in Asia, we reported the isolation of variants of with atypical NAD dependency. The present study was conducted to characterize the genotypes of 24 isolates of in Korea, including the four variants reported previously. Most of the typical isolates (19/20) showed a unique ERIC-PCR pattern with no ERIC-PCR patterns in common between the typical isolates and the variants. Read More

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http://dx.doi.org/10.1080/03079457.2019.1692128DOI Listing

Molecular characterization of a Marek's disease virus strain detected in tumour-bearing turkeys.

Avian Pathol 2020 Apr 22;49(2):202-207. Epub 2019 Nov 22.

Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell'Emilia, BO, Italy.

Marek's disease (MD) is a lymphoproliferative disease caused by (GaHV-2), which primarily affects chickens. However, the virus is also able to induce tumours in turkeys, albeit less frequently than in chickens. This study reports the molecular characterization of a GaHV-2 strain detected in a flock of Italian meat-type turkeys exhibiting visceral lymphomas. Read More

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http://dx.doi.org/10.1080/03079457.2019.1691715DOI Listing

mutation regulated avian pathogenic pathogenicity though stress-resistance pathway.

Avian Pathol 2020 Apr 27;49(2):144-152. Epub 2019 Nov 27.

Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, College of Animal Science and Technology, Anhui Agricultural University, Hefei, People's Republic of China.

gene mutation decreased the pathogenicity of the avian pathogenic strain, AE17. However, the associated regulatory mechanism of remains unknown. In this study, we examined the bactericidal activity of chicken serum and blood, as well as bacterial survival in HD11 macrophages. Read More

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http://dx.doi.org/10.1080/03079457.2019.1687844DOI Listing

Unravelling fatty liver haemorrhagic syndrome: 2. Inflammation and pathophysiology.

Avian Pathol 2020 Apr 5;49(2):131-143. Epub 2019 Nov 5.

School of Agriculture and Food Sciences, University of Queensland, Gatton, Australia.

To study the role of inflammation in the pathophysiology of the fatty liver haemorrhagic syndrome (FLHS), mature laying hens were treated with oestrogen (β-oestradiol-17-dipropionate or E) and challenged with lipopolysaccharide (LPS). Oestrogen injections induced FLHS, but the incidence and severity of the condition was increased with a combination of E & LPS. Hepatic mRNA levels of the genes encoding key regulators of inflammation, such as interleukin-1β (IL-1β), interleukin-6 (IL-6) and interleukin-18 (IL-18), were evaluated. Read More

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http://dx.doi.org/10.1080/03079457.2019.1682119DOI Listing
April 2020
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Monitoring of free-ranging and captive populations in Western Europe for avian bornaviruses, circoviruses and polyomaviruses.

Avian Pathol 2020 Apr 1;49(2):119-130. Epub 2019 Nov 1.

Institute of Virology, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.

Avian pathogens such as bornaviruses, circoviruses and polyomaviruses are widely distributed in captive collections of psittacine birds worldwide and can cause fatal diseases. In contrast, only little is known about their presence in free-ranging psittacines and their impact on these populations. Rose-ringed parakeets () and Alexandrine parakeets () are non-native to Europe, but have established stable populations in parts of Western Europe. Read More

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http://dx.doi.org/10.1080/03079457.2019.1681359DOI Listing

Retrospective study on transmissible viral proventriculitis and chicken proventricular necrosis virus (CPNV) in the UK.

Avian Pathol 2020 Feb 21;49(1):99-105. Epub 2019 Oct 21.

IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Barcelona, Spain.

Chicken proventricular necrosis virus (CPNV) is a recently described birnavirus, which has been proposed to be the cause of transmissible viral proventriculitis (TVP). The understanding of the epidemiology of both the virus and the disease is very limited. A retrospective investigation on TVP and CPNV in broiler chicken submissions from the UK from between 1994 and 2015 was performed with the aims of assessing the longitudinal temporal evolution of TVP and CPNV, and to review the histological proventricular lesions in the studied chickens. Read More

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http://dx.doi.org/10.1080/03079457.2019.1677856DOI Listing
February 2020

Influences of swab types and storage temperatures on isolation and molecular detection of and .

Avian Pathol 2020 Feb 22;49(1):106-110. Epub 2019 Oct 22.

Institute of Infection and Global Health, University of Liverpool, Neston, UK.

Routine diagnosis of (MG) and (MS) is performed by collecting oropharyngeal swabs, followed by isolation and/or detection by molecular methods. The storage temperature, storage duration and the type of swab could be critical factors for successful isolation or molecular detection. The aim of this study was to compare the influence of different types of cotton-tipped swab stored at different temperatures, on the detection of MG and MS. Read More

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http://dx.doi.org/10.1080/03079457.2019.1675865DOI Listing
February 2020

Unravelling fatty liver haemorrhagic syndrome: 1. Oestrogen and inflammation.

Avian Pathol 2020 Feb 21;49(1):87-98. Epub 2019 Oct 21.

School of Agriculture and Food Sciences, University of Queensland, Gatton, Australia.

Previous studies have implicated oestrogen as a factor in the induction of fatty liver haemorrhagic syndrome (FLHS). In this study, a refined laying hen model was employed to permit further investigations. Intramuscular (i. Read More

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http://dx.doi.org/10.1080/03079457.2019.1674444DOI Listing
February 2020
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Pathology caused by three species of that infect the turkey with a description of a scoring system for intestinal lesions.

Avian Pathol 2020 Feb 4;49(1):80-86. Epub 2019 Oct 4.

Department of Poultry Science, University of Arkansas, Fayetteville, AR, USA.

Three-week-old turkey poults were infected with pure lines of three species of (, , and ) recently isolated from commercial turkey farms. The lines had been propagated from a single oocyst and identified by species-specific PCR amplification of the mitochondrial cytochrome c oxidase subunit I (COI) gene. Five to six days after infection their intestines were removed and examined for the presence of intestinal lesions. Read More

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http://dx.doi.org/10.1080/03079457.2019.1669767DOI Listing
February 2020

Correlates of pathological lesions associated with respiratory cryptosporidiosis prevalence in shot red grouse from moors in northern England.

Avian Pathol 2020 Feb 16;49(1):74-79. Epub 2019 Oct 16.

The Game & Wildlife Conservation Trust, Durham, UK.

Infection of wild red grouse by was first diagnosed in 2010. Within three years, signs of infection were reported from grouse on half of all grouse moors in northern England, bringing severe concerns of economic losses to grouse shooting. A total of 45,914 red grouse shot from 10 moors in northern England between 2013 and 2018 were visually screened for signs of respiratory cryptosporidiosis. Read More

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http://dx.doi.org/10.1080/03079457.2019.1667478DOI Listing
February 2020
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The impact of the COREMI Cost Action Network on the progress towards the control of the poultry red mite, .

Avian Pathol 2019 Sep;48(sup1):S1

Department of Pathobiology and Population Sciences, The Royal Veterinary College, University of London , Hatfield , UK.

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http://dx.doi.org/10.1080/03079457.2019.1662175DOI Listing
September 2019
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Relative contribution of vertical, within-farm and between-farm transmission of in layer pullet flocks.

Avian Pathol 2020 Feb 7;49(1):56-61. Epub 2019 Oct 7.

GD Animal Health, Deventer, the Netherlands.

In this study, the relative contribution of vertical transmission, within-farm transmission and between-farm transmission of in layer pullet flocks was quantified using logistic regression analysis. Data from 311 Dutch pullet flocks, of which 172 (55%) were positive for , were included in the study. Also the status of the parent stock of these flocks was included. Read More

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http://dx.doi.org/10.1080/03079457.2019.1664725DOI Listing
February 2020

Identification of antigenic epitopes in the haemagglutinin protein of H7 avian influenza virus.

Avian Pathol 2020 Feb 8;49(1):62-73. Epub 2019 Oct 8.

MOE Joint International Research Laboratory of Animal Health and Food Safety, Institute of Immunology, Nanjing Agricultural University, Nanjing, People's Republic of China.

The H7 subtype avian influenza virus (AIV) has been reported to infect not only poultry but also humans. The haemagglutinin (HA) protein is the major surface antigen of AIV and plays an important role in viral infection. In this study, five monoclonal antibodies (mAbs, 2F8, 3F6, 5C11, 5E2 and 5C12) against the HA protein of H7 virus were produced and characterized. Read More

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http://dx.doi.org/10.1080/03079457.2019.1666971DOI Listing
February 2020
1 Read
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