New host records of the nematode Gnathostoma sp. in Mexico.

Gnathostomiasis is an emerging zoonosis in Mexico. However, for most endemic zones, the source of human infection has not been established. During 2000-2003, we investigated 2168 vertebrates (2047 fish, 31 amphibians, 4 reptiles, 19 birds and 67 mammals) from 39 localities distributed in nine states. We registered 7 vertebrate species as new hosts for Gnathostoma, and 22 new locality records for this nematode.