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The aim of the study was to assess the role of chicken anaemia virus (CAV) in precipitating important poul- try diseases in commercial poultry flocks and its molecular surveillance in poultry flocks of North India (Uttarakhand and Uttar Pradesh states) and Nepal (Mahendra Nagar). Study was conducted during September-2012 to April-2013 on 13 randomly selected poultry flocks. Necropsy was performed for making tentative diagnosis of other concomitant diseases and samples were collected and epidemiological data was recorded. Flocks were screened for CAV by VP2 gene based PCR followed by PCR-RFLP analysis of viral genome. Haemato-biochemical parameters of flocks were also studied. Out of 185 tissue samples, PCR screening confirmed the presence of CAV genome in 95 samples, while 50 showed other viruses like infectious bursal disease (IBD), Inclusion Body Hepatitis (IBH) and Marek's Disease (MD). PCR-RFLP analysis of the full genome of different CAV isolates with Hin d III, Pst I, Nhe I and Mbo II re- striction enzymes showed indistinguishable restriction patterns. A significant decline in erythrocytic and leukocytic cell counts, and increase in the activities of degenerating enzymes was observed in CAV positive flocks. In conclusion, CAV was detected at different poultry farms of India and Nepal and its association with precipitation of other poultry diseases through its marked immunosuppressive potential is evident from findings of present study. Thus, the role of CAV in precipitating other infectious diseases in birds along with molecular epidemiology and immunosuppressive effects needs to be studied in detail so that a comprehensive strategy may be formulated for timely adoption of effective prevention and control measures, subsequently alleviating economic losses in poultry rearing countries.

advances in animal and veterinary sciences

Clinical Association of Chicken Anaemia Virus with Other Infectious Poultry Diseases in North India and Nepal: Its Pathological Studies, Molecular Epidemiology and RFLP Pattern of PCR Amplified Full Length Viral Genome