Evidence of different Enterocytozoon bieneusi genotypes in patients with and without human immunodeficiency virus infection.

We classified 100 Enterocytozoon bieneusi isolates into five genotypes by a PCR-restriction fragment length polymorphism method. Type I strains were encountered only in human immunodeficiency virus (HIV)-infected patients, whereas type II strains were more frequently found in non-HIV-infected patients (75 versus 10%, respectively; P < 10(-4)), suggesting differences in the epidemiology of E. bieneusi among these patients.