Electrophoretic separation of Cryptosporidium oocyst wall protein gene-polymerase chain reaction products digested with the endonuclease RsaI. Lane M, 50-bp size ladder; CpH, Cryptosporidium parvum human genotype; CpC C. parvum calf genotype; Cw, C. wrairi; Cf, C. felis; Cb, C. baileyi; Cs, C. serpentis; Cm, C. muris.