Host switching of human lice to new world monkeys in South America.
The coevolution between a host and its obligate parasite is exemplified in the sucking lice that infest primates. In the context of close lice-host partnerships and cospeciation, Pediculus mjobergi, the louse of New World primates, has long been puzzling because its morphology resembles that of human lice. To investigate the possibility that P. mjobergi was transmitted to monkeys from the first humans who set foot on the American continent thousands of years ago, we obtained and compared P. mjobergi lice collected from howler monkeys from Argentina to human lice gathered from a remote and isolated village in Amazonia that has escaped globalization. Morphological examinations were first conducted and verified the similarity between the monkey and human lice. The molecular characterization of several nuclear and mitochondrial genetic markers in the two types of lice revealed that one of the P. mjobergi specimens had a unique haplotype that clustered with the haplotypes of Amazonian head lice that are prevalent in tropical regions in the Americas, a natural habitat of New World monkeys. Because this phylogenetic group forms a separate branch within the clade of lice from humans that were of American origin, this finding indicates that human lice have transferred to New World monkeys.
['Drali|Rezak|R|', 'Abi-Rached|Laurent|L|', 'Boutellis|Amina|A|', 'Djossou|Félix|F|', 'Barker|Stephen C|SC|', 'Raoult|Didier|D|']
D000818:Animals D004272:DNA, Mitochondrial D005838:Genotype D058507:Host Specificity D006801:Humans D010373:Lice Infestations D008992:Monkey Diseases D010374:Pediculus D010802:Phylogeny D051078:Platyrrhini
Cospeciation Pediculus mjobergi Amazonian head louse Host-switching