The role of Haemophilus ducreyi in penile ulcers in Bangkok, Thailand.

In October 1982, penile ulcers were identified in 248 (19%) of 1282 men at Bangrak Hospital, Bangkok, Thailand. The etiology of the ulcers was determined for 120 (48%) of these patients. Haemophilus ducreyi was isolated from 45 (38%), herpes simplex virus from 14 (12%), and Neisseria gonorrhoeae from two (2%) of 120 patients. Syphilis was detected in one patient. Two patients had both H. ducreyi and herpes simplex virus isolated from the same ulcer. Thirty-five per cent of patients had a single ulcer, 56% had two to four ulcers, and 9% had more than four. Ulcers were located on the prepuce or coronal sulcus (69%), frenulum (18%), shaft (9%), and glans (4%). Inguinal adenopathy was present in only 11% of patients. H. ducreyi infection was diagnosed by gram stain in 28 (62%) of 45 patients from whom H. ducreyi was isolated and in only one of 75 patients from whom H. ducreyi was not isolated. Of the 45 isolates of H. ducreyi, 42 (93%) were isolated with use of media containing horse blood and 34 (76%) with use of media containing rabbit blood.