To assess previous HIV testing patterns among adults and adolescents newly diagnosed with HIV infection, CDC analyzed data for the period 2006–2009 from 18 jurisdictions participating in HIV incidence surveillance through CDC's National HIV Surveillance System (NHSS). This report describes the results of that analysis, which indicated that among adults and adolescents for whom testing history information (THI) was available, 41% were diagnosed with HIV infection at their first HIV test, and 59% had a negative test at some point before HIV diagnosis.
Source: http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6124a2.htm?s_cid=mm6124a2_e
Mario Andretti Jackie Stewart Nigel Mansell Kimi Raikkonen