Spirochetes in late seronegative syphili, despite penicillin therapy.
D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010406:Penicillins / Q000627:therapeutic use*; D013587:Syphilis / Q000188:drug therapy*; D013588:Syphilis Serodiagnosis; D014209:Treponema Immobilization Test
D010406:Penicillins