Possible zoonotic implications of the discovery of the advanced third stage larva of (Spirurida: Gnathostomatidae) in a Mexican fish species.

Gnathostomiasis in humans is acquired by consumption of any infected second intermediate host or paratenic host. This includes amphibians, snakes and poultry as well as fish. In this work we report for the first time in Mexico the presence of an AdvL of in the musculature of a wild fish (, which also acts as intermediate host for the larvae of and ), from the Papaloapan River, Veracruz; previously, larvae of had only been recorded in amphibians in Mexico and in wild swamp eels from Tampa, Florida, USA.