National HIV Testing Day is an annual occasion to encourage people to get an HIV test. 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. People who test HIV positive can take medicines to stay healthy and greatly reduce their chance of transmitting the virus. People who test negative can continue to take steps to prevent HIV infection, such as always using a condom during sex.