Immunosuppressive potential and pathogenicity of an avian adenovirus isolate involved in hydropericardium syndrome in broilers.
ABSTRACT The role of avian adenovirus isolate PARC-1 as an immunosuppressive agent was investigated using a Newcastle disease virus (NDV) vaccine immune response procedure. The immunosuppressive effect on the humoral immune response was investigated up to 21 days after inoculation with adenovirus. Infected chickens showed a serologic response to NDV that was reduced compared with that of the controls. To further investigate the effect of the virus on major lymphoid organs, the pattern of virus dissemination in various organs was studied at various time intervals after inoculation. Spleen, thymus, bursa of Fabricius, and cecal tonsils of broilers were examined using a dot-immunobinding assay. The virus was found to have a predilection for lymphoid organs, and virus from lymphoid organs was capable of producing disease when inoculated into healthy chickens. The relationship of virus predilection to its immunosuppressive effect also was studied.
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ABSTRACT: Hydropericardium syndrome (HPS) is a highly infectious disease caused by fowl adenovirus serotype 4 (FAV-4) affecting poultry, especially broiler birds. The disease was initially reported from Angara Goth, Pakistan, and then from India during 1994, in the poultry belt of Jammu and Kashmir, and thereafter, from almost all parts of the country, causing heavy economic losses to the poultry industry. The disease occurs predominantly in broilers of the age group of 3-5 weeks, characterized by sudden onset of high mortality up to 80 %. The causative agent of HPS is fowl adenovirus 4, which is a member of the species Fowl Adenovirus C, genus Aviadenovirus, family Adenoviridae . FAV-4 is non-enveloped and icosahedral in shape, measuring 70-90 nm in size and containing a linear dsDNA of approximately 45 kb in size as its genome. The livers of affected birds show necrotic foci and basophilic intranuclear inclusion bodies in the hepatocytes. The disease can be diagnosed from its gross and microscopic changes in the liver and by various serological tests, such as agar gel immunodiffusion, counterimmunoelectrophoresis, indirect haemagglutination, fluorescent antibody techniques, and ELISA. In the past few years, PCR has been used as a rapid diagnostic tool for the detection of fowl adenoviruses. The disease has been brought under control by the use of formalin-inactivated, attenuated or live vaccines in experimentally infected birds. Advancement in the field of computational immunology accelerates knowledge acquisition and simultaneously reduces the time and effort involved in screening potential epitopes, leading toward the development of epitope-based vaccines.Archives of Virology 12/2012; · 2.11 Impact Factor
Article: Isolation, Cloning and In silico Study of Hexon Gene of Fowl Adenovirus 4 (FAV4) Isolates Associated with Hydro Pericardium Syndrome in Domestic Fowl[show abstract] [hide abstract]
ABSTRACT: Hydropericardium syndrome is an important emerging disease of domestic fowl caused by fowl adenovirus serotype 4 (FAV-4). The full length hexon gene was isolated by PCR from the three virus isolates and it has been possible to clone hexon gene from all the three isolates into pGEM-T Easy vector, sequenced and analyzed using online bioinformatics tools (ExPASy server). The sequences were submitted to NCBI Gen Bank. These sequences showed significant homology with FAV-4 hexon gene sequences available in the NCBI Gen Bank and also found to be clustered with FAV-9 and FAV-10 serotypes. Probable secondary structures were also studied and compared using on line ExPASy servers. Possible B-cell epitopes were also predicted using on line ABCpred server and their position on the 3D structure of the proteins were also studied.J of Proteomics & Bioinformatics. 01/2011; vol 4(9):190-195.
Article: EFFECT OF FOWL ADENOVIRUS (FAdV-7) INFECTION ON THE REPLICATION OF TURKEY HERPESVIRUS FC126 IN CHICKEN EMBRYO FIBROBLAST CULTURES[show abstract] [hide abstract]
ABSTRACT: The aim of the study was to determine the influence of simultaneous infection of chicken embryo fibroblasts (CEF) with different doses of adenovirus field strain serotype 7 (FAdV-7 JN-5/10j) and turkey herpesvirus strain FC126 (FC126 HVT) on replication of the herpesvirus in in vitro cultures. Three experiments were performed: simultaneous infection of CEF with adenovirus and HVT; inoculation of CEF culture with adenovirus, followed by infection with HVT after 24 h; and inoculation of CEF with HVT, followed by the infection with adenovirus 24 h later. In order to detect the presence of HVT and adenovirus strains in CEF culture, SORF 1 and hexon genes were determined, respectively. The infection with adenovirus lowered replication of FC126 HVT in chicken embryo fibroblast.Bulletin- Veterinary Institute in Pulawy 12/2012; · 0.41 Impact Factor