title: [Ecoepidemiology of Haemonchus contortus bahiensis, ecotype present in sheep of arid zones of Venezuela].
abstract: The frequency distribution of female Haemonchus contortus bahiensis Grisi, 1974 in sheep from Venezuelan arid zones is 15.32% for the type with vulvar flap, 51.6% for the vulvar-knob and 33.07% for smooth type. A Shannon-Weaver diversity index corresponding to 1.44 bits was calculated for these forms with similarities in the general size, egg-size and in the number of the longitudinal cuticular ridges. An aggregated kind of distribution in the host population according to the K parameter of a negative binomial distribution was recorded for male and female worms. A complicated interaction was observed between the abundance, aggregation and prevalence of this ecotype and the importance of these findings is discussed with regard to host-parasite relationships.
mesh_terms: D000818:Animals; D005260:Female; D006188:Haemonchiasis / Q000662:veterinary*; D006189:Haemonchus / Q000502:physiology; D006790:Host-Parasite Interactions; D008297:Male; D012756:Sheep; D012757:Sheep Diseases / Q000469:parasitology*; D014252:Trichostrongyloidiasis / Q000662:veterinary*; D014687:Venezuela
vernacular_title: Eco-epidemiología de Haemonchus contortus bahiensis, ecotipo presenteen ovinos de zonas áridas de Venezuela.