Which of the following parasites must be swallowed twice by the human host, first as an egg and later as a larva?

Question

Quizplus · Accepted Answer

Ascaris lumbricoides, also known as the giant intestinal roundworm, must be swallowed twice by the human host. The first time, the eggs are ingested from contaminated soil or food. Once in the intestine, the eggs hatch into larvae and penetrate the intestinal wall, entering the bloodstream and migrating to the lungs. There, they are coughed up and swallowed again, returning to the intestine to mature into adult worms.

Which of the Following Parasites Must Be Swallowed Twice by the Human