According to the Centers for Disease Control and Prevention (CDC), about one in seven people in the United States who are infected with HIV don’t know they have it. Knowing one’s HIV status provides powerful information. People who test positive for HIV can take medicines to keep them healthy and to greatly reduce their chance of passing HIV to others. But the only way to know for sure if someone has HIV is to get tested. 

On June 27th—National HIV Testing Day—people nationwide are encouraged to learn their HIV status. CDC recommends that everyone between the ages of 13 and 64 get tested for HIV at least once as part of routine health care. People with certain risk factors should get tested more often. 

Source: https://aidsinfo.nih.gov/understanding-hiv-aids/hiv-aids-awareness-days/163/national-hiv-testing-day