Studies on the prevalence and laboratory transmission of fascioliasis in animals in the Kashmir valley

In Kashmir, 85·1% of cattle, 51·3% of sheep and 14·8% of goats were found infected with Fasciola spp. The prevalence rate varied from 66·6 to 100·0%, 25·0 to 100% and nil to 66·0% in cattle, sheep and goats respectively in different months of the year. Fasciola gigantica was the predominant species in all animal species but sheep harboured both F. gigantica and F. hepatica. The prevalence of F. hepatica infection in sheep happens to be the first report from India. Lymnaea auricularia sensu stricto supported the development of F. gigantica under laboratory conditions. The incubation temperature affected the shedding of the cercariae. Snails maintained at 25–27 °C started cercarial shedding as early as day 20 post-infection (PI), whereas those maintained at 10–12 °C commenced it from day 64 PI. One out of three experimentally infected guinea pigs aged 1 month revealed adult flukes in the liver at necropsy on day 52 PI.