Thumbnail of Agarose gel (2%) visualization of diagnostic polymerase chain reaction products of four Cryptosporidium genotypes. Lane S, standard 100-bp ladder; lane 1, patient 53, zoonotic genotype 2; lane 2, patient 119, Cryptosporidium sp. (zoonotic, canine genotype); lane 3, patient 84, C. felis (zoonotic, feline genotype); lane 4, patient 75, anthroponotic genotype 1.