Epidemiology of virus
Viral epidemiology is about the study of occurrence and spread of viruses in population over time. The features like host, virus and the specific environment of growth are monitored to determine the dynamics of viral infections, the ultimate target is to devise intervention policies. In the sense of epidemiology, the 'pathogenicity' is the extent of total infections that produce the evident disease, which is almost varying from virus to virus and may be affected by some host factors. This analysis prominence on the epidemiology of recently appeared virus and infectious diseases in human and other animals. The diseases are acquired immunodeficiency syndrome (AIDS), bovine spongiform encephalopathy, canine haemorrhagic disease and respiratory syndrome in animals like horses.