12 May 2012 ... How Do Viruses Infect the Body? Viruses can enter the human body through any of its openings, but most often they use the nose and mouth.
Viruses can infect every living thing -- from plants and animals down to the smallest ... The human body does have some natural defenses against a virus. A cell ...
Find out what a virus does to your body and how to decrease your chance of exposure. ... Once inside, they find a host cell to infect. ... The human immunodeficiency virus (HIV), which causes AIDS, attacks the T-cells of the immune system.