Before researching how medicines and epidemics interact with one another, it is important to understand basic concepts of how viruses infect their host and how immune system fight against such pathogens. In this section, one may explore the human immune system, virus infection, and traditional medicines used to overcome illness.

• Human immune system:
How the immune system protects the body from foreign invaders


• Virus infection:
Information on discovery of virus and its general characteristics


• Traditional medicine of different nations:How people of different regions dealt with diseases