Host pathogen interaction
Host pathogen interaction are mediated by invading of microbial pathogens proteins that exploit the host cell for their survival. Pathogens poses the inherent ability to cross the anatomical barrier that limit the healthy microbes to make the normal flora. These interactions are the major selective acting on the human to contribute the shape of the genetic diversity. Microbial virulence is one of the dependents on host factors. This relationship of the pathogen is studied under three stages such as pre-penetration stage, penetration stage and post penetration stage.