Question

After infective small strongyle eggs are ingested, they hatch and penetrate the wall of the intestine, migrate in the bloodstream to the lungs where they may cause some respiratory problems, and are then coughed up, swallowed, and mature in the small intestine.

(True / False)

Answer 1

The lifecycle described in the question is incorrect for small strongyles and is instead characteristic of Strongyloides stercoralis or Ascaris lumbricoides. Both Strongyloides stercoralis and Ascaris lumbricoides migrate from the skin or intestine to the lungs, are coughed up, swallowed, and then mature in the intestine.

Step-by-step explanation:

The statement you asked about is False. The lifecycle described does not apply to small strongyles but rather to several other parasitic nematodes. The lifecycle of small strongyles, commonly found in equines, involves the ingestion of infective larvae with their subsequent development into adult strongyles in the large intestine. However, the life cycle you're describing resembles that of other parasitic worms such as Strongyloides stercoralis, which causes strongyloidiasis, and Ascaris lumbricoides, which causes ascariasis.

Infective larvae of Strongyloides stercoralis generally penetrate the skin, migrate to the lungs, are coughed up and swallowed, and then mature in the intestines. Similarly, Ascaris lumbricoides transmission begins with the ingestion of eggs. The larvae hatch in the intestine, travel to the lungs, and migrate to the pharynx where they are swallowed to reach the intestines and mature.