The CDC estimates that as many as 25% of people who are infected with HIV don't know that they are positive. But new rapid HIV tests can quickly inform some patients of their status before they infect someone else.
In a recent study, CDC researchers administered rapid HIV tests to over 23,000 people in major US cities. They were able to identify only about one percent of the people tested, which meant 267 people learned of their HIV infection this way.
The test requires just a drop of blood and can produce results in as little as 20 minutes.