A person presents to his physician complaining of chronic GI symptoms. A diagnosis of Ascaris lumbricoides was made. Human nematodes infect individuals via different routes. This patient was most likely infected by which of the following? (AIPG 2012)
|A||Larvae penetrating unprotected skin|
|B||Ingesting larvated eggs|
|C||Eating uncooked pork|
a. Ascaris is acquired by ingesting infective eggs, as are the whip-worm, Trichuris trichiura, and the pinworm, Enterobius vermicularis.
b. Filariform larvae penetrating unprotected skin is the route by which a person becomes infected by other intestinal nematodes, hookworms and Strongyloides; eating uncooked pork could lead to trichinosis; and internal autoinfection is caused only by Strongyloides.