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The whipworm of humans,  Trichuris trichiura , is responsible for a neglected tropical disease (NTD) of major importance in tropical and subtropical countries of the world. Whipworms also infect animal hosts, including pigs, dogs and non-human primates, cause clinical disease (trichuriasis) similar to that of humans. Although  Trichuris  species are usually considered to be host specific, it is not clear whether non-human primates are infected with  T. trichiura  or other species. In the present study, we sequenced the complete mitochondrial (mt) genome as well as the first and second internal transcribed spacers (ITS-1 and ITS-2) of  Trichuris  from the François’ leaf-monkey (langur), and compared them with homologous sequences from human- and pig-derived  Trichuris . In addition, sequence comparison of a conserved mt ribosomal gene among multiple individual whipworms revealed substantial nucleotide differences among these three host species but limited sequence variation within each of them. The molecular data indicate that the monkey-derived whipworm is a separate species from that of humans. Future work should focus on detailed population genetic and morphological studies (by electron microscopy) of whipworms from various non-humans primates and humans.

Mitochondrial and Nuclear Ribosomal DNA Evidence Supports the Existence of a New Trichuris Species in the Endangered François’ Leaf-Monkey