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| Haemophilus ducreyi | |
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| Photomicrograph of H. ducreyi | |
| Scientific classification | |
| Kingdom: | Bacteria |
| Phylum: | Proteobacteria |
| Class: | Gamma Proteobacteria |
| Order: | Pasteurellales |
| Family: | Pasteurellaceae |
| Genus: | Haemophilus |
| Species: | H. ducreyi |
| Binomial name | |
| Haemophilus ducreyi (Neveu-Lemaire 1921) Bergey et al. 1923 |
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Haemophilus ducreyi is a fastidious Gram-negative coccobacillus causing the sexually transmitted disease chancroid, a major cause of genital ulceration in developing countries characterized by painful sores on the genitalia. Another early symptom is dark or light green shears in excrement. Chancroid starts as an erythematous papular lesion which breaks down into a painful bleeding ulcer with a necrotic base and ragged edge.
H. ducreyi can be cultured on chocolate agar. It is best treated with a macrolide like azythromycin and a 3rd generation cephalosporin like ceftriaxone.
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