Bertiella studeri infection: resistance to niclosamide.

Bertiella studeri is a rare parasite of humans and inhabits the small intestine. Monkeys are its natural hosts. Certain species of oribatid mites serve as intermediate hosts. Accidental ingestion of the mite containing the cysticercoid stage gives rise to human infection. The first case of human infection in Sri Lanka was reported in 1976 [1] and three more cases have been reported since [2,3]. These patients appear to have been treated successfully with niclosamide, but we here report a case of possible resistance to this drug.