MedicalResearch.com Interview with: Sonia Singh, PhD, Epidemiologist Division of HIV/AIDS Prevention CDC  MedicalResearch.com: What is the background for this study? What are the main findings? Response: HIV infection is a persistent health concern in the United States, particularly for people at high risk of infection such as gay and bisexual men. We used data from the National HIV Surveillance System to estimate HIV incidence and prevalence and the percentage of undiagnosed HIV infections overall and among gay and bisexual men. Estimated HIV incidence declined nearly 15% overall in the U.S. from an estimated 45,200 infections in 2008 to 38,500 in 2015. Estimated HIV incidence declined for both males (9%) and females (33%) over this period. Estimated HIV incidence declined 32% among heterosexuals, 42% among people who inject drugs and 20% among gay and bisexual men who also inject drugs. Estimated HIV incidence remained relatively stable among gay and bisexual men; however, it increased over 25% among Latino gay and bisexual men, almost 45% among gay and bisexual men ages 25 to 34 and 30% among gay and bisexual men ages 55 and older. The percentage of undiagnosed HIV infections decreased nearly 20%, from 18.1% in 2008 to 14.5% in 2015. The percentage of undiagnosed HIV infections among gay and bisexual men declined 21.6%, from 21.3% in 2008 to 16.7% in 2015. In 2015, the percentage of undiagnosed HIV infections was highest among gay and bisexual males ages 13-24 (52.2%) compared to other age groups and higher among Latino (20.1%) and African American (19.6%) gay and bisexual men, as well as Asian gay and bisexual men (20.5%), compared to white gay and bisexual men (11.9%). (more…)