Abstract
Human gnathostomiasis is a food-born parasitic disease of relative importance in many countries in Southeast Asia. It is caused by several species of nematodes of the genus Gnathostoma. In Mexico is an emerging public health problem since 1970, when first cases were reported. Until today, larval morphometric characters that have been proposed to differentiate between the three species of Gnathostoma present in this country, are not satisfactory. Recently, the presence of advanced third-stage larvae AdvL3 (infective form for humans) in freshwater fishes from Pantanos de Centla, Tabasco. was recorded but their specific identity was not clarified . Examination of four species of freshwater fishes from the same locality revealed that three of them: Petenia splendida (n=58), Cichlasoma managuense (n=35) and Gobiomorus dormitor (n=9) were infected by 15 AdvL3 of Gnathostoma binucleatum. Specific identity was obtained comparing the internal transcribed spacer 2 (ITS2) of the ribosomal DNA with sequences reported in Genbank. This is the first record of G. binucleatum in P. splendida and G. dormitor from Tabasco and the first specific determination of the parasite in the locality.
Highlights
La Gnatostomiasis es una enfermedad producida en el hombre y vertebrados silvestres por nemátodos del género Gnathostoma Owen, 1836, en cuyo ciclo de vida intervienen un copépodo como primer hospedero intermediario, un pez como segundo y un mamífero como definitivo; el hombre se infecta accidentalmente al ingerir carne cruda de peces de agua dulce
Human gnathostomiasis is a food-born parasitic disease of relative importance in many countries in Southeast Asia. It is caused by several species of nematodes of the genus Gnathostoma
Larval morphometric characters that have been proposed to differentiate between the three species of Gnathostoma present in this country, are not satisfactory
Summary
La Gnatostomiasis es una enfermedad producida en el hombre y vertebrados silvestres por nemátodos del género Gnathostoma Owen, 1836, en cuyo ciclo de vida intervienen un copépodo como primer hospedero intermediario, un pez como segundo y un mamífero como definitivo; el hombre se infecta accidentalmente al ingerir carne cruda de peces de agua dulce. Ambas especies de peces han sido señaladas previamente como hospederos intermediarios de G. binucleatum en seis localidades de México (Pérez-Ponce de León et al 1996, Lamothe-Argumedo 1997, Almeyda-Artigas et al 2000); sin embargo, en ninguna se ha establecido el nivel de la infección, lo que impide realizar comparaciones con nuestros resultados.
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