Post coital pin-worm infection.
In Ibadan, Nigeria, an Enterobius vermicularis worm was found in the urine of a soldier complaining of urethral irritation that had started 4 hours after coitus. After his first post-coital micturition, which yielded the worm, the irritation stopped. There was convincing evidence that the worm had entered the soldier's urethra from his partner's perianal region (rear-entry coital position, no ejaculation because of partner's complaint of painful coitus, the partner was a school girl of 15, enterobiasis is common in young school girls in the city, etc.).
D000293:Adolescent; D003075:Coitus; D004757:Enterobius / Q000302:isolation & purification; D005260:Female; D006801:Humans; D008297:Male; D010123:Oxyuriasis / Q000469:parasitology / Q000635:transmission*; D014522:Urethral Diseases / Q000469:parasitology / Q000635:transmission*; D014556:Urine / Q000469:parasitology