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Avian Pathology: Journal of the W.V.P.A

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https://www.readbyqxmd.com/read/28532188/differential-amplification-of-marek-s-disease-cvi988-vaccine-and-of-wild-type-isolates-from-organs-of-commercial-chickens-using-single-or-duplexed-probes-in-real-time-pcr
#1
Irit Davidson, Amira Natour-Altoury, Israel Raibstein, Yaad Dahan
The DIVA test, based on the MDV pp38 gene was described by Baigent et al. (2016), using similar primers and alternate probes for virulent MDV-1 and the vaccine CVI988 virus. We now explored the assay applicability for commercial vaccines and for DNAs of commercial chickens, as former study employed tissue cultured prototype MDV strains and chicken tissue from experimental infection trials. DNA of chicken visceral organs and feathers of either vaccinated, or naturally-infected with virulent MDV-1 wild-type viruses was used for DIVA-PCR real-time PCR...
May 22, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28532159/the-route-of-inoculation-dictates-replication-patterns-of-infectious-laryngotracheitis-virus-iltv-pathogenic-strain-and-chicken-embryo-origin-ceo-vaccine
#2
Leticia Gabriela Beltrán, S M Williams, Guillermo Zavala, James S Guy, Maricarmen García
Infectious laryngotracheitis virus (ILTV) has a high affinity to replicate in the larynx and trachea causing severe lesions. Apart from the trachea, lack of knowledge exists on the ability of ILTV to replicate in other respiratory associated tissues. The objective of this study was to investigate how tissues that first encounter the virus dictate further sites of viral replication during the lytic stage of infection. Replication patterns of pathogenic strain 63140 and the chicken embryo origin (CEO) vaccine in conjunctiva, Harderian gland, nasal cavity and trachea were evaluated after ocular, oral, intranasal or intratracheal inoculation of specific pathogen free chickens...
May 22, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28503965/prevalence-of-campylobacter-species-in-wild-birds-of-south-korea
#3
Yong-Kuk Kwon, Jae-Young Oh, Ok-Mi Jeong, Oun-Kyoung Moon, Min-Su Kang, Byeong-Yeal Jung, Byung-Ki An, So-Youn Youn, Hye-Ryoung Kim, Il Jang, Hee-Soo Lee
Campylobacter species cause human gastrointestinal infections worldwide. They commonly inhabit intestines of avian species including wild birds. They might play a role in the spread of infections to humans and other bird species. The prevalence of Campylobacter species in 2164 faecal samples of wild birds (representing 71 species and 28 families) captured across the Korean peninsula was evaluated in this study. The overall prevalence was 15.3% (332/2164). Bird species belonging to the family Charadriidae had the highest isolation rate (30...
May 15, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28503936/immune-responses-following-experimental-infection-with-ascaridia-galli-and-necrotic-enteritis-in-broiler-chickens
#4
Isabelle Ruhnke, Nicholas Matthew Andronicos, Peter Hunt, Brad Hine, Nisha Sharma, Sarbast K Kheravii, Shu-Biao Wu, Robert A Swick
Broilers commonly suffer from necrotic enteritis (NE). Other gastrointestinal infectious diseases affect poultry, including nematode infections which are considered a re-emerging disease in barn and free-range systems. The aim of this study was to characterise the immune response of broilers after artificial infection with NE and contrast these with responses to the nematode Ascaridia galli and determine whether immune parameters measured during the course of infection can be used to distinguish infected from uninfected birds...
May 15, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28488474/prevalence-of-salmonella-spp-in-environmental-samples-from-table-egg-barns-in-alberta
#5
Joan A St Amand, Rashed Cassis, Robin K King, Colleen B Annett Christianson
Some Salmonella spp. are zoonotic, a frequent cause of food borne illness in Canada, and known to infect humans through contaminated poultry and poultry products. Certain serotypes of Salmonella spp. have been demonstrated to be vertically transmitted from hen to egg. The incidence of Salmonella spp. isolation in the flock has been correlated to its isolation from the environment. Twenty-one producers were enrolled in this study to examine the occurrence of Salmonella spp. in 48 table egg layer flocks housed in 35 barns in Alberta...
May 10, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28488446/plasma-protein-hematologic-and-blood-chemistry-changes-in-african-grey-parrots-psittacus-erithacus-experimentally-infected-with-bornavirus
#6
Charlotte Högemann, Rüdiger Richter, Rüdiger Korbel, Monika Rinder
Bornaviruses are considered to be the causative agent of proventricular dilatation disease (PDD) in psittacine birds. In order to detect hematological and blood chemistry changes during the development of PDD and a possible correlation with clinical symptoms and the virological status, six African grey parrots (Psittacus erithacus) were experimentally infected with parrot bornavirus genotype 4 (PaBV-4) by subcutaneous route. All six parrots developed clinical signs of varying extent and successful infection was confirmed in all the birds by seroconversion or detection of RNA of the PaBV-4 infection strain...
May 10, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28470101/o-polysaccharide-is-important-for-salmonella-pullorum-survival-in-egg-albumen-and-virulence-and-colonisation-in-chicken-embryos
#7
Rongxian Guo, Zhuoyang Li, Yang Jiao, Shizhong Geng, Zhiming Pan, Xiang Chen, Qiuchun Li, Xinan Jiao
The pathogen Salmonella Pullorum is the causative agent of persistent systemic infection of poultry, leading to economic losses in developing countries due to morbidity, mortality and reduction in egg production. These infections may result in vertical transmission to eggs or progeny. Limited information is available regarding the mechanisms involved in the survival of Salmonella Pullorum in egg albumen and developing chicken embryos. Hence, we investigated the role of O-polysaccharide in the contamination of eggs and the colonisation of chicken embryos...
May 4, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28470098/chicken-embryo-lethality-assay-for-determining-the-lethal-dose-and-virulence-of-enterococcus-faecalis
#8
Ana E Blanco, Martin Barz, Wiebke Icken, David Cavero, Reza Sharifi, Matthias Voss, Rudolf Preisinger, Carlos Buxadé
Enterococcus faecalis is the major pathogen found in field cases of amyloid arthropathy in chickens. Given the need of a better understanding of the virulence mechanisms of the causative strains, the Embryo Lethality Assay (ELA) is proposed in the present study as a model to evaluate the virulence of E. faecalis strains, specifically the pathogenic avian strain K923/96, which was previously related with amyloid arthropathy. Hence, 0.2 ml of five doses of the cited strain (from 2.5 to 2500 colony-forming unit (CFU) per ml) were inoculated into the allantoic cavity of 10 day-old embryos...
May 4, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28470089/contribution-of-the-csga-and-bcsa-genes-to-salmonella-enterica-serovar-pullorum-biofilm-formation-and-virulence
#9
Muhanad El Hag, Feng Zheng, Su Yangyang, Wang Xiao, Afrah Yassin, Chen Sujuan, Daxin Peng, Xiufan Liu
Salmonella biofilm formation is important to environmental stress resistance and virulence. However, the roles of the csgA and bcsA genes, which affect curli protein and cellulose production, respectively, in Salmonella enterica serovar Pullorum, are unknown. Here we constructed deletions in the csgA and bcsA genes in Salmonella enterica serovar Pullorum strain S6702 and evaluated several aspects of biofilm formation and virulence. ΔcsgA showed decreased production of curli fimbriae, while ΔbcsA had reduced cellulose production...
May 4, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28447468/induction-of-apoptosis-in-the-bursa-of-fabricius-by-vaccination-against-gumboro-disease
#10
Marcelo Pablo Killian, Juan David Boviez, Mariana Gambarotta, Daniel Marcelo Lombardo
Infectious bursal disease is a severe acute viral disease of young chicken, affecting mainly the B-lymphocytes in the bursa of Fabricius, leading to severe immunosuppression as a result, on the death of lymphoid cells. In the bursa infected with infectious bursal disease virus, viral replication is associated with apoptosis of lymphoid cells, inflammatory change, and atrophy. Vaccination has appeared to be a crucial factor for control and prevention, being the live attenuated vaccines the most used. However, the apoptotic effect of these vaccines over the bursa has not been tested...
April 27, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28303720/primary-newcastle-disease-vaccination-of-broilers-comparison-of-the-antibody-seroresponse-and-adverse-vaccinal-reaction-after-eye-nose-drop-or-coarse-spray-application-and-implication-of-the-results-for-a-previously-developed-coarse-dry-powder-vaccine
#11
W J M Landman, C Vervaet, J P Remon, K Huyge, J H H van Eck
To compare antibody seroresponse and adverse vaccinal reaction induced by Newcastle disease (ND) vaccination after eye-nose drop or coarse spray, groups of SPF broiler hens were vaccinated at day 4 (day of hatch is day 0) and intratracheally inoculated with Escherichia coli at day 11. Body weight gain (BWG) was assessed between day 4 and day 18; colibacillosis lesions and serum antibodies were determined at day 18. Meaningful comparison requires similar vaccine uptake. Vaccine virus loss during spray relative to eye-nose drop, which was assessed by comparing the results of endpoint titrations, was 3 log10...
April 24, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28151004/evaluation-of-factors-influencing-the-development-of-late-marek-s-disease-virus-induced-immunosuppression-virus-pathotype-and-host-sex
#12
Nik M Faiz, Aneg L Cortes, James S Guy, Oscar J Fletcher, Thomas Cimino, Isabel M Gimeno
Marek's disease virus (MDV) is a herpesvirus that induces lymphoma and immunosuppression in chickens. MDV-induced immunosuppression (MDV-IS) is complex and can be divided into two phases: early-MDV-IS associated with cytolytic infection in the lymphoid organs in chickens lacking maternal antibodies against MDV (MAbs) and late-MDV-IS that appears later in the pathogenesis and occurs even in chickens bearing MAbs. We have recently developed a model to reproduce late-MDV-IS under laboratory conditions. This model evaluates late-MDV-IS indirectly by assessing the effect of MDV infection on the efficacy of infectious laryngotracheitis (ILT) vaccines against challenge with ILT virus...
April 24, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28345962/immune-responses-to-vaccination-and-infection-with-mycoplasma-gallisepticum-in-turkeys
#13
Dinidu S Wijesurendra, Anna Kanci, Kelly A Tivendale, Joanne M Devlin, Nadeeka K Wawegama, Barbara Bacci, Amir H Noormohammadi, Philip F Markham, Glenn F Browning
Infection with Mycoplasma gallisepticum induces severe lymphoproliferative lesions in multiple sites along the respiratory tract in chickens and turkeys. These immunopathological responses have been well-characterized in chickens, but have not been studied closely in turkeys. The aim of the study described here was to examine the immune responses of turkeys after live vaccination and infection with M. gallisepticum. In a strain comparison study, the mean log10 antibody titre of birds exposed to an aerosol culture of M...
April 20, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28277780/development-validation-and-field-evaluation-of-a-quantitative-real-time-pcr-able-to-differentiate-between-field-mycoplasma-synoviae-and-the-ms-h-live-vaccine-strain
#14
R Dijkman, A Feberwee, W J M Landman
A quantitative PCR (qPCR) able to differentiate between field Mycoplasma synoviae and MS-H vaccine strain was developed, validated and evaluated. It was developed using nucleotide differences in the obg gene. Analytical specificity and sensitivity were assessed using DNA from 194 M. synoviae field samples, three different batches of MS-H vaccine and from 43 samples representing four other avian Mycoplasma species proved to be 100%. The detection limit for field M. synoviae and MS-H vaccine strain was 10(2-3) and 10(2) colony-forming units PCR equivalents/g trachea mucus, respectively...
April 20, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28421832/experimental-induction-of-chicken-aa-amyloidosis-in-white-layer-chickens-by-inoculation-with-inactivated-vaccines
#15
Wazir Ahmad Habibi, Takuya Hirai, Mohammad Hakim Niazmand, Naoko Okumura, Ryoji Yamaguchi
We investigated the amyloidogenic potential of inactivated vaccines and the localized production of serum amyloid A (SAA) at the injection site in white layer chickens. Hens in the treated group were injected intramuscularly three times with high doses of inactivated oil-emulsion Salmonella Enteritidis vaccine and multivalent viral and bacterial inactivated oil-emulsion vaccines at two week intervals. Chickens in the control group did not receive any inoculum. In the treated group, emaciation, and granulomas were present, while several chickens died between 4-6 weeks after the first injection...
April 19, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28421815/cross-protection-conferred-by-immunization-with-a-romph-based-intranasal-fowl-cholera-vaccine
#16
Thanya Varinrak, Pichayanut Poolperm, Takuo Sawada, Nattawooti Sthitmatee
A previous study demonstrated that a recombinant outer membrane protein H (rOmpH)-based intranasal fowl cholera vaccine elicited efficient homologous protection against Pasteurella multocida strain X-73 (A:1) in chickens. The present study aimed to determine the cross protectivity against heterologous P. multocida strains. The rOmpH was purified via electroelution and formulated with two kinds of adjuvants. The vaccine formulations in a total volume of 100 µl were 100 µg rOmpH with 3 µg of Escherichia coli enterotoxin B (LTB) or 10 µg of CpG ODN2007...
April 19, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28421811/characterization-of-ornithobacterium-rhinotracheale-field-isolates-from-hungary
#17
Réka Szabó, Enikő Wehmann, László Makrai, Csaba Nemes, Éva Gyuris, Ákos Thuma, Tibor Magyar
Ornithobacterium rhinotracheale is a widely distributed rod-shaped gram-negative bacterium that infects several avian species including chickens and turkeys. It is associated with respiratory signs, growth retardation, mortality, and reduced egg production thus causing severe economic losses to the poultry industries. In this study, 37 field isolates of O. rhinotracheale, collected from various locations in Hungary between 1997 and 2015, were identified and molecularly characterized by the analysis of partial 16S rRNA gene sequences, enterobacterial repetitive intergenic consensus (ERIC)-PCR and random amplified polymorphic DNA (RAPD) PCR assays with the OPG11, OPH19, and M13 primers...
April 19, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28417679/synergy-or-interference-of-a-h9n2-avian-influenza-virus-with-a-velogenic-newcastle-disease-virus-in-chickens-are-dose-dependent
#18
Francesco Bonfante, Giovanni Cattoli, Sofia Leardini, Angela Salomoni, Eva Mazzetto, Irit Davidson, Ruth Haddas, Calogero Terregino
Field observations indicate that the impact of velogenic Newcastle disease virus (vNDV) is more severe in countries with concomitant circulation of LPAI virus, as is the case in the Middle East, in particular in Israel, where H9N2 and NDV are endemic. In our study, we evaluated how the exposure of chickens to a H9N2 challenge either favors or interferes with a subsequent vNDV infection and its transmission to sentinels. For this purpose, single vNDV and sequential H9/NDV challenges were performed with increasing doses of vNDV (10(1)-10(6) EID50)...
April 18, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28290221/microbiological-diagnosis-and-antimicrobial-sensitivity-profiles-in-diseased-free-living-raptors
#19
Anna Vidal, Laia Baldomà, Rafael A Molina-Lopez, Marga Martin, Laila Darwich
Free-living raptors (birds of prey) can act as reservoirs of potentially zoonotic agents but they also can be affected by microorganisms as target hosts. In this retrospective study, microbiological results (n=663) and antibiotic sensitivity profiles (n=108) of bacterial isolates were analyzed from diseased free-living raptors. Sixty-nine percent of cases (n=457) yielded bacteria: 58% were in pure culture and 42% were of different species. Remarkably, samples from necropsies (47%) had higher percentage of pure isolations than those obtained from clinical (31%) samples (p<0...
March 14, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28290220/specific-antibody-mediated-immunity-in-the-reproductive-tract-of-laying-chickens-immunized-against-newcastle-disease-with-conventional-attenuated-and-inactivated-vaccines
#20
F Rauw, T G Nguyen, E Ngabirano, S Marché, B Lambrecht
Despite the widespread and successful use of Newcastle disease (ND) vaccines, Newcastle disease virus (NDV) can seriously injure the reproductive tract of egg-laying hens, leading to rapid egg-drop and poor shell quality. Few published studies investigated local NDV-specific immune response in the reproductive tract after ND-vaccination of hens. The present study investigated, for the first time, local NDV-specific antibody-mediated immunity in segments of the oviduct during the laying period. Specific pathogen-free (SPF) White Leghorn chickens were immunized following a ND vaccination program applied in the field, which combined ND-attenuated vaccine (inoculated subcutaneously at one day, 2 weeks and 11 weeks of age) with inactivated vaccine (inoculated intramuscularly at 17 weeks)...
March 14, 2017: Avian Pathology: Journal of the W.V.P.A
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