A 31 year old man presents with a painful ulcer of the penis and a lump in the left groin for 2 weeks. He recalls having unprotected sex with a commercial sex worker around a week before the ulcer appeared. His medical, surgical and family histories are unremarkable.
VDRL: non reactive HIV Screening test: negative
The PCR test is negative.
Cultures are positive for Haemophilus ducreyi
Cultures are negative.