Using DNA sequencing and phylogenetic analysis, we identified four distinct
Cryptosporidium genotypes in HIV-infected patients: genotype 1 (human), ge
notype 2 (bovine) Cryptosporidium parvum, a genotype identical to C. felis,
and one identical to a Cryptosporidium sp. isolate from a dog. This is the
first identification of human infection with the latter two genotypes.