A farmer who raises sheep and cattle shows signs of jaundice. Along with elevated liver enzymes, he also has an elevated eosinophil count. A fecal sample for ova and parasites shows the parasite form seen below at 400$\times$. The organism causing this infection is

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The parasite seen in the fecal sample is Fasciola hepatica, which is a liver fluke that infects sheep and cattle. The farmer's jaundice and elevated liver enzymes are consistent with liver damage caused by this parasite. The elevated eosinophil count is also a common finding in infections with F. hepatica. Paragonimus westermani and Heterophyes heterophyes are lung flukes that do not infect sheep or cattle, and Schistosoma mansoni is a blood fluke that does not cause liver damage.

A Farmer Who Raises Sheep and Cattle Shows Signs of Jaundice