[Seasonal variations of Fasciola hepatica infection in goats in the area of Haouz (Morocco)].

Abstract

The prevalence and level of infection with Fasciola hepatica were assessed monthly over a 12-month period in goats slaughtered in the Haouz area, in correlation with the dynamics of Lymnaea truncatula populations. The infection rate was high in winter (23.8%) in January), and summer (17.1% in August), and relatively low in spring and at the beginning of autumn. The infected animals had a fluke burden range of 1-48; a mean of 13 was recorded in July. Lymnaeid snails were observed in their habitat throughout the year, but were more abundant during the hot months (July and August). Snails infected with F hepatica were found in February, June, July and August; their infection rate did not exceed 3%. These data enabled us to hypothesize that the main periods for transmission of fascioliasis were spring and fall; however, potential infections during other periods of the year were possible. The susceptibility of goats to infection with F hepatica appears to be similar to that reported in sheep.