Four Principles of HIV & STI transmission

The four principles of HIV transmission can help providers and patients assess the level of risk of different sexual practices for HIV infection. In order for HIV transmission to occur, all four principles of HIV transmission are needed.

EXIT –the virus must exit the body infected person

SURVIVE –the virus must be in conditions in which it can survive

SUFFICIENT –there must be sufficient
quantities of the virus present to cause
infection

ENTER –the virus must enter the bloodstream