title: Repeated testing advised for at-risk MSM groups. Some may need testing more than once a year.
mesh_terms: D015492:AIDS Serodiagnosis / Q000706:statistics & numerical data*; D015658:HIV Infections / Q000175:diagnosis / Q000517:prevention & control*; D018451:Homosexuality, Male; D006801:Humans; D008297:Male; D012307:Risk Factors; D021841:Safe Sex