Abstract

Microsporidia form a large and ubiquitous group of obligately intracellular parasitic eukaryotes, increasingly recognized as pathogens in humans. Transmission of invertebrate microsporidia to mammals has been considered impossible because temperature seemed to be a limiting factor for development. Nosema algerae, a microsporidian of anopheline mosquitoes, was cultured in human muscle fibroblasts at temperatures of 31 degrees C and 38 degrees C. This is the first record of an invertebrate microsporidian developing in human cells at a temperature above 36 degrees C. The ultrastructure of N. algerae growing in human muscle fibroblasts is similar to that of Brachiola vesicularum, a microsporidian species previously described in the muscle of an AIDS patient.

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