Sexually-transmitted infection

Disease	Organism	First-line treatment	Treatment if allergic	Treatment if pregnant
Lymphogranuloma venereum	Chlamydia trachomatis serovars L1, L2, L3	doxycycline for 3 weeks		erythromycin
Chancroid	Haemophilus ducreyi	azithromycin 1 g po once		ceftriaxone 250 mg IM once
Chlamydia	Chlamydia trachomatis	azithromycin 1 g po once		azithromycin 1 g po once, or amoxicillin 500 mg po tid for 7 days
Donovanosis	Klebsiella granulomatis	doxycycline 100 mg po bid for 3 weeks		erythromycin