Journal
JOURNAL OF INFECTIOUS DISEASES
Volume 222, Issue 6, Pages 1027-1036Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/infdis/jiaa195
Keywords
Babesia microti; babesiosis; clofazimine; immunocompromised; mice; mutation; radical cure; resistance
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Funding
- National Research Center for Protozoan Diseases at the Obihiro University of Agriculture and Veterinary Medicine [29-joint-4]
- Japan Society for the Promotion of Science (KAKEN) [18H02337, P18399]
- Gordon and Llura Gund Foundation
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Background. Persistent and relapsing babesiosis caused by Babesia microti often occurs in immunocompromised patients, and has been associated with resistance to antimicrobial agents such as atovaquone. Given the rising incidence of babesiosis in the United States, novel drugs are urgently needed. In the current study, we tested whether clofazimine (CFZ), an antibiotic used to treat leprosy and drug-resistant tuberculosis, is effective against B. microti. Methods. Mice with severe combined immunodeficiency were infected with 107 B. microti-infected erythrocytes. Parasites were detected by means of microscopic examination of Giemsa-stained blood smears or nested polymerase chain reaction. CFZ was administered orally. Results. Uninterrupted monotherapy with CFZ curtailed the rise of parasitemia and achieved radical cure. B. microti parasites and B. microti DNA were cleared by days 10 and 50 of therapy, respectively. A 7-day administration of CFZ delayed the rise of parasitemia by 22 days. This rise was caused by B. microti isolates that did not carry mutations in the cytochrome b gene. Accordingly, a 14-day administration of CFZ was sufficient to resolve high-grade parasitemia caused by atovaquone-resistant B. microti parasites. Conclusions. Clofazimine is effective against B. microti infection in the immunocompromised host. Additional preclinical studies are required to identify the minimal dose and dosage of CFZ for babesiosis.
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