Paromomycin Inhibits Cryptosporidium Infection of a Human Enterocyte Cell Line

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Abstract
Cryptosporidium parvum is a protozoan parasite that causes severe enteritis in patients with AIDS for which there is no effective therapy. Paromomycin is a nonabsorbable aminoglycoside that is effective in the treatment of other intestinal protozoa. The ability of paromomycin to inhibit C. parvum infection of a differentiated human enterocyte cell line was evaluated in vitro. Paromomycin concentrations ranging from 50 to 5000 µg/ml inhibited infection at 24 h in a dose-dependent fashion. Concentrations >1000 µg/ml, which are theoretically achievable in the bowel lumen, inhibited infection by >85% (P < .001). Prospective clinical trials of paromomycin for the treatment of cryptosporidiosis in patients with AIDS are warranted.

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