TABLE 3.

Species of microsporidia known to infect immunocompetent humans

SpeciesClinical manifestation in immunocompetent hostIn vitro culture achieved
Brachiola (Nosema) algerae Keratoconjunctivitis+
Encephalitozoon intestinalis Self-limiting diarrhea
Enterocytozoon bieneusi Self-limiting diarrhea
Nosema ocularum Keratitis
Vittaforma corneae Keratitis+
Microsporidium ceylonensisa Keratitis
Microsporidium africanuma Keratitis
  • a These are poorly described species and have been arbitrarily assigned to the genus Microsporidium, and the true taxonomic affinities of these two species have not been established.