Phylogenetic relationships of gp60 subtypes of C. parvum and C. viatorum identified in the study and other gp60 subtype sequences deposited in GenBank, as inferred by a neighbor-joining analysis of gp60 sequences based on the genetic distance by the Kimura 2-parameter model. The numbers displayed on the branches represent the percentage bootstrapping outcomes derived from 1000 replicates. The sequences generated in the present study are indicated with solid circles.