Percentages of HIV cases reported in 1999 by gender:
| Age | % Female | % Male |
| 13- to 19-year olds | 63 | 47 |
| 20- to 24-year-olds | 44 | 66 |
HIV data are reported by 33 states (not including California and New York) and the U.S. Virgin Islands. SOURCE: Youth and HIV/AIDS 2000: A New American Agenda. White House Office of National AIDS Policy.
In a study of 3,492 15- to 22-year-old men who have sex with men in seven metropolitan areas, researchers found a high percentage were infected with HIV, particularly blacks, men of mixed race or ethnicity, and Hispanics.
| Characteristics | % HIV positive |
| 15- to 19-years-old | 5.6 |
| 20- to 22-years-old | 8.6 |
| White | 3.3 |
| Black | 14.1 |
| Asian/Asian Am./Pacific Islander | |
| Hispanic | 3 |
| Mixed or other race | 6.9 |
| Heterosexual | 12.6 |
| Homosexual | 3.8 |
| Bisexual | 7.5 |
| Transgender | 6.5 |
| 14.3 |
SOURCE: Valleroy, L.A., MacKellar, D.A., Karon, J.M., Rosen, D.H., McFarland, W., Shehan, D.A., Stoyanoff, S.R., LaLota, M., Celentano, D.D., Koblin, B.A., Thiede, H., Katz, M.H., Torian, L.V., & Janssen, R.S. (2000). HIV prevalence and associated risks in young men who have sex with men. Journal of the American Medical Association, 284(2), 198-204.