We are currently exposed to a wide variety of infectious diseases almost every day. Evaluating our resistance to those infectious diseases can be crucial to preventing infection. Evaluating for prior exposure and current infections with multiple viral testing like parvovirus, hepatitis, HIV, herpes simplex and other viral illnesses. Deficiency of macronutrients and vitamins can put us at risk for infection. Infection with some viruses, such as HIV and hepatitis, can lower our immune system and make us more susceptible.