years living with diagnosed HIV infection (prevalence) at the end of 2008. Behavioral Risk Factor Surveillance System data from 2010 were used to estimate percentages by state of persons aged 18--64 years who reported testing for HIV during the 12 months preceding the interview. Medical Monitoring Project (MMP) data were used to estimate numbers and nationally representative percentages of adults aged 18 years receiving medical care who reported receiving prevention counseling in a clinical setting during the 12 months preceding the interview, and whose medical record documented that they 1) were prescribed ART during the 12 months preceding the interview and 2) had a suppressed viral load (defined as 200 copies/mL) at their most recent test.Using these surveillance data and published information, CDC assessed the estimated number of persons with HIV infection (7) and the numbers and percentages of persons who were 1) aware of their infection (7), 2) linked to care (8,9), 3) retained in care (8--11), 4) prescribed ART, and 5) virally suppressed. From these analyses, CDC developed a national estimate of the percentage of all HIV-infected persons with viral suppression.ResultsIn 2008, an estimated 1.2 million persons were living with HIV in the United States, of whom 80% had been diagnosed (7). The prevalence rate for persons aged 18--64 years with an HIV diagnosis ranged by state from 40.1 to 3,365.2 per 100,000 population (Figure 1). In 2010, an estimated 9.6% of persons aged 18--64 years reported recent HIV testing (range by state: 4.9%--29.8%) (Figure 2). In general, recent HIV testing percentages were higher in states with higher HIV prevalence rates.According to published studies, approximately 77% of persons diagnosed with HIV were linked to care within 3--4 months of diagnosis (8,9), and 51% were retained in ongoing care (8--11). Among adults aged 18 years in MMP representing persons receiving HIV medical care, 89% had been prescribed ART. Of these, 77% had a suppressed viral load at their most recent test (Table). CDC synthesized these findings to determine the number of persons in selected categories of the continuum of HIV care (Figure 3), and estimated that 328,475 (35%) of 941,950 persons diagnosed with HIV (or 28% of all 1,178,350 persons with HIV) in the United States are virally suppressed.The percentages of patients in MMP who were prescribed ART, had documented viral suppression, and received prevention counseling from a health-care provider during the preceding 12 months varied by age group, race/ethnicity, and reported sexual behavior (Table). Prescription of ART ranged from 76% for patients aged 18--24 years to 92% for those aged 55 years; of those prescribed ART, viral suppression was lowest among patients aged 25--34 years (69%) and highest in those aged 55 years (85%). Among the 92% of whites, 89% of Hispanics or Latinos, and 86% of blacks or African Americans who were prescribed ART, 84% of whites and 79% of Hispanics or Latinos had documented viral suppression, compared with 70% of blacks or African Americans. ART prescriptions were documented for 91% of men who have sex with women only (MSW), 89% of men who have sex with men (MSM),