How does an oral HIV test work?

According to a recent report from the federal Centers for Disease Control and Prevention, more than 40 percent of the adult population in the United States has been tested, at least once, for HIV. However, 250,000 people are infected and don’t know it.

When the CDC announced in September 2006 that everyone between the ages of 13 and 64 should start getting tested for HIV as regularly as they… » Full Story on HowStuffWorks