title: An old enemy is back.
authors.forename: Claudia
authors.initials: C
authors.lastname: Kalb
mesh_terms: D004196:Disease Outbreaks; D018451:Homosexuality, Male; D006801:Humans; D008297:Male; D013587:Syphilis / Q000453:epidemiology* / Q000635:transmission; D014481:United States / Q000453:epidemiology; D014504:Urban Health / Q000706:statistics & numerical data*