| Causative organism | Haemophilus ducreyi |
| Incubation period | 6 days to 2 weeks |
| How far to trace back | 2 weeks before ulcer appeared or since arrival in endemic area |
| Usual testing method | Nucleic acid amplification testing or culture |
| Common symptoms | Painful anogenital ulcers; enlarged tender inguinal nodes (buboes) which may break down and discharge |
| Likelihood of transmission per act of unprotected intercourse | High |
| Likelihood of long-term sexual partner being infected | High; asymptomatic infection is thought to occur sometimes in women |
| Protective effect of condoms | Probably high |
| Transmission by oral sex | Rare |
| Duration of potential infectivity | Weeks |
| Important sequelae | Local tissue destruction, inguinal abscesses and draining sinuses
Enhanced HIV transmission |
| Direct benefit of detection and treatment of contacts | Cure |
| Usual management of contacts | Counselling, clinical examination and testing of lesions for chancroid
Presumptively treat partners with azithromycin 1g as a single dose or ceftriaxone 500mg as a single dose by intramuscular injection |
| Contact tracing priority | High as not endemic in Australia or New Zealand. Specialist support for contact tracing should be sought if local acquisition or transmission is possible (see Appendix B) |
| Notification | Notifiable by all doctors in all Australian states and territories, and in New Zealand, and by laboratory on positive isolation in Australian states and territories |