title: AIDS among persons age > or = 50 years--United States, 1991-1996.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology*; D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging; D002487:Centers for Disease Control and Prevention, U.S.; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D014481:United States