Aim:The present study aimed to investigate the seroepidemiology of infectious bovine rhinotracheitis (IBR) infection in the non-vaccinated cattle population in northern part of Tamil Nadu, India.Materials and Methods:A total of 255 sera samples were collected from cattle having the history of respiratory and reproductive disorder from cattle of different age, breeds, and sex. All the sera samples were subjected to indirect ELISA for the diagnosis of IBR antibodies.Results:Results revealed that the seroprevalence of IBR infection among non-vaccinated cattle population was of 65.88%. No significant difference was noticed in the prevalence of IBR infection between cattle showing respiratory (63.64%) and reproductive form (70.89%) (p≥0.05). A higher prevalence was noticed in animals above 3 years of age (59.60%) and in crossbred animals (71.26%) than young and non-descript animals. This study showed the higher prevalence of IBR infection in female (67.92%) than in male (33.33%).Conclusion:Cattle population in this part can better be protected with vaccination than leaving them unvaccinated and sero-monitoring shall have to be stressed with regular attempts to isolate and characterize the causative agent for IBR.

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The prevalence of Marek's disease virus-1 (MDV-1) was analysed from 60 flocks of commercial broiler chicken of Tamil Nadu, India which were not vaccinated against the MDV. The feather follicle epitheliums (FFE) were collected randomly from 1-15 days and 16-40 days age group and all the samples were subjected to Polymerase Chain Reaction (PCR) by amplifying the MDV-1 specific Meq gene. Among the overall prevalence of 20 per cent, none of the samples were showed amplification of MDV-1 Meq gene in 1-15 days age group, whereas 33.36 per cent of positivity was noticed in 16-40 days age group. At present, no MDV vaccination is practised in commercial broilers in India. Albeit, no gross lesions were reported within 40 days of its marketing age, but the confirmation of prevalence in FFE may be source of MDV to other susceptible chickens. Hence, vaccination to broilers can only reduce the spread of MDV-1.