<unk>  is a fastidious gram-negative coccobacillus causing chancroid, a gential ulcer disease. A genetically distinct non-sexually transmitted strain may also cause cutaneous limb ulcers.
Haemophilus ducreyi
Cryptosporidium hominis
Klebsiella rhinoscleromatis
Ureaplasma urealyticum
Gardnerella vaginalis
Chlamydia trachomatis
Mycobacterium ulcerans
Chlamydophila trachomatis