Prevalence of undiagnosed syphilis in the elderly.
D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010406:Penicillins / Q000627:therapeutic use; D013587:Syphilis / Q000175:diagnosis* / Q000188:drug therapy
D010406:Penicillins