A 12-year-old boy reports feeling tingling and itching of his legs 30 minutes after swimming in a lake. Over the next day, small papules develop followed by blisters of the legs. Dermatitis due to schistosome infection is diagnosed. What larval stage most likely caused the infection? (AIPG 2012)
a. Forked-tail cercariae are infective for humans.
b. A filariform larva is the infective stage for hookworm and strongyloides, both nematode parasites.
c. A cysticercus larva (B) is the infective stage of Taenia species of tapeworms.
d. A miracidium (D) is the stage of flukes that infects snails, not humans.