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Phylogenetic relationships among field samples and GenBank Cryptosporidium sequences (2, 5, 11, 15, 18, 31-33, 35-37). Phylogeny based upon multiple sequence alignments performed with MacVector 7.0 by using the Tamura-Nei algorithm. A distance of 0.10 indicates a 10% difference between sequences. Field samples are labeled as follows: source-clone no. date sampled (e.g., “Manure-4 6/26/00” denotes clone 4 of manure sampled on 26 June 2000).
