Avaliação do desenvolvimento de ovos de Ancylostoma caninum e Trichuris vulpis submetidos à baixas temperaturas e infecção experimental com Trichuris vulpis em cães

Abstract

Ancylostoma caninum and Trichuris vulpis are gastrointestinal nematodes of dogs, they have worldwide distribution and are of great importance in veterinary medicine. Prevalence studies show that these nematodes are present in Brazil, domiciled and stray dogs. They have great importance in public health, being considered as etiologic agents of Syndrome Larva Migrans Cutaneous and Visceral, respectively. Dogs infected play an important role in the spread of these nematodes, especially in public places, due to not remove the feces containing phases of development, increasing the chance of infection of dogs and people, mainly children.The effect of temperature on egg development of geo-helminths is rarely studied, it is first carried out a study to assess egg after storage at low temperatures. This study aimed to assess the development of eggs A.caninum and T.vulpis kept under ± 10°C and -4°C. Feces stored under ± 10°C can be used to perform the EPG A. caninum up to 10 weeks, most of the eggs remained in stock after gastrula stage, and egg viability is affected not going development to L 3 . Feces samples can be used to evaluate the OPG T. vulpis stock after the ± 10°C and -4° C for up to 12 weeks. Eggs of T. vulpis develop until egg larvae after inventory at low temperatures. Doses of 1,000 and 1,500 embryonated eggs generated T.vulpis infection in dogs and haematological indices remained close to the reference in spite of infection. T.vulpis eggs experimentally infected dogs developed into larvae after egg inventory at low temperatures