There has been an good amount of increase in the number of Americans tested for HIV with a record of 11.4 million people since 2006.

The CDC's Vital Signs report said the percentage of adults who had been tested at least once in their lives increased to 45 percent -- or 82.9 million -- in 2009, after holding steady at approximately 40 percent from 2001 to 2006.
But 55 percent of American adults -- and 28.3 percent of people with a risk factor for AIDS -- have never been tested, so more action is needed, the CDC said.
"Today's news shows that we have had progress increasing testing, and that more progress is both necessary and possible," said CDC chief Thomas Frieden.
"With most adults and with nearly a third of high-risk people having never been tested for HIV, we need to do more to ensure that all Americans have access to voluntary, routine and early HIV testing in order to save lives and reduce the spread of this terrible disease."
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"Reducing the number of undiagnosed infections is a critical component of HIV prevention, as most sexually transmitted HIV infections in the United States are transmitted by people who are unaware of their infection," the CDC report said.