Skip directly to search Skip directly to A to Z list Skip directly to site content
CDC Home
For questions about DPDx, contact us

DPDx is an education resource designed for health professionals and laboratory scientists. For an overview including prevention and control visit


[Anncaliia spp.] [Encephalitozoon cuniculi] [Encephalitozoon hellem] [Encephalitozoon intestinalis (syn. Septata intestinalis)] [Tubulinosema acridophagus] [Enterocytozoon bieneusi] [Nosema spp.] [Pleistophora sp.] [Trachipleistophora spp.] [Vittaforma corneae (syn. Nosema corneum)]

Treatment Information

For gastrointestinal infections caused by Enterocytozoon bieneusi, fumagillin 20 mg orally three times daily is the only drug with proven efficacy. However, its use is associated with severe thrombocytopenia in 30-50% of patients, which is reversible upon discontinuation of treatment, and the drug is not currently available in the United States.

For disseminated (not ocular) and intestinal infection attributed to microsporidia other than E. bieneusi and Vittaforma corneae, the drug of choice is albendazole 400 mg orally twice daily. Treatment should continue until immune reconstitution has been maintained for at least 6 months. Itraconazole 400 mg orally daily plus albendazole 400 mg orally twice daily may have activity for disseminated disease attributed to Trachipleistophora or Anncaliia.

For ocular infection, the treatment of choice is topical fumagillin bicylohexylammonium (Fumidil B) 3 mg/mL in saline (fumagillin 70 µg/mL) eye drops: two drops every 2 hours for 4 days, then two drops four times daily (investigational use only in United States) plus albendazole 400 mg orally twice daily for management of systemic infection.

Initiation or optimization of antiretroviral therapy is the cornerstone of treatment of microsporidiosis in HIV-infected patients. Immune restoration to CD4 cell count >100 cells/mm3 is associated with resolution of symptoms of enteric microsporidiosis. Management of severe dehydration, malnutrition, and wasting with fluid support and nutritional supplementation should be provided. Use of antimotility agents for diarrhea control can be considered in infected adults.

Although albendazole is likely less effective against E. bieneusi, there are reports of success with albendazole therapy in immunosuppressed patients.

For more information, please visit

* This drug is approved by the FDA, but considered investigational for this purpose.

Back to Top

This information is provided as an informational resource for licensed health care providers as guidance only. It is not intended as a substitute for professional judgment.

For questions about DPDx, contact us
  • Page last reviewed November 29, 2013
  • Page last updated November 29, 2013
  • Content source: Global Health - Division of Parasitic Diseases and Malaria
  • Notice: Linking to a non-federal site does not constitute an endorsement by HHS, CDC or any of its employees of the sponsors or the information and products presented on the site. The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Road Atlanta, GA 30329-4027, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348 - Contact CDC–INFO