Treatment of chancroid with erythromycin. A clinical and microbiological appraisal.

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Abstract
Patients (137) presenting with genital ulcerations from which Haemophilus ducreyi was isolated, were treated with erythromycin stearate 500 mg every 6 h for 7 days. Of these, 91 (66%) had associated inguinal lymphadenopathy. Only 2 of the 100 patients who returned after 1 wk showed no clinical improvement. Despite decrease in size H. ducreyi was reisolated from the ulcers of 3 patients, 2 of whom had not complied with treatment. The patients were treated for a further week either with erythromycin or with a placebo preparation and on day 14 no discernible difference in clinical response was evident. H. ducreyi was not reisolated from any lesion. The natural course of development of associated lymphadenopathy was not modified by treatment. H. ducreyi was not isolated from any gland after the start of treatment. Side effects attributable to erythromycin were minimal and treatment had to be discontinued in only 2 patients. This study clearly indicates that treatment with erythromycin for 1 wk results in rapid healing of lesions and the elimination of H. ducreyi from both ulcers and associated lymph glands.