Recent developments in the epidemiology of virus diseases.

This research article explores the changing nature of viral epidemics in both humans and animals, particularly in relation to recent disease outbreaks. The research credits this evolution to three factors: the virus itself, the host, and the environmental conditions, with a detailed focus on new virus diseases such as HIV/AIDS, haemorraghic fevers, Mad Cow Disease, and respiratory syndrome in horses.

Aetiological Agent

• The aetiological agent refers to the cause of the disease, which in this case is the virus. The study reveals that genetic alterations of the virus are a major driver in the evolution and variation of diseases. These genetic changes can result from two mechanisms: mutations such as recombination and reassortment; and selection for resistance or susceptibility.

Host

• The study also touches upon the role of the host – humans or animals – in the evolution of these diseases. This can include aspects such as the immunity of the host, its susceptibility to infection, and how these factors can shape the course and severity of the disease.

Environment

• Environmental conditions are another major consideration in the spread and development of viral diseases. Factors such as climate, the availability of hosts, and human activities, can all influence the course of an epidemic.

Epidemiology of Newly Emerged Virus Diseases

• The article presents an in-depth review of the epidemiology of newly emerged viral diseases in humans and animals, including HIV/AIDS, haemorraghic fevers, Mad Cow Disease (Bovine Spongiform Encephalopathy), canine haemorrhagic disease, and respiratory syndrome in horses.
• The authors study these diseases to understand their patterns, causes, and effects on the populations they infect. This information is crucial for inform public health strategies to control and prevent the spread of these diseases.