Multiple choice The infective stage of the liver fluke for sheep is known as: redia cercaria miracidium cysticercus Reveal answer Fill a bubble to check yourself B Correct answer Explanation The cercaria is the free-swimming infective stage of liver flukes (Fasciola hepatica) that actively penetrates the host's skin. Redia and miracidium are earlier developmental stages, while cysticercus is a tapeworm larval stage.