Multiple Choice
Which of the following terms does NOT describe cestodes?
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31. Microbial Infections - Digestive System
Helminthic Diseases of the Digestive System
Multiple Choice
Which of the following statements is true?
A
Pigs are the normal definitive hosts of T. solium, but humans may be infected if they consume the eggs.
B
During the pork or beef tapeworm lifecycle, gravid proglottids are found in the muscle of the secondary host.
C
Tapeworms are most often spread through fecal-oral contamination from human to human.
D
Consuming tapeworm eggs or gravid proglottids will not lead to infection by an adult tapeworm.
Verified step by step guidance1
Step 1: Understand the lifecycle of \(\emph{Taenia solium}\) (pork tapeworm). The definitive host, where the adult tapeworm lives and reproduces, is the human, not the pig. Pigs act as the intermediate host, harboring the larval cysticerci in their muscles after ingesting eggs.
Step 2: Recognize that gravid proglottids, which contain eggs, are released in the feces of the definitive host (human) and are not found in the muscle tissue of the intermediate host (pig or cow). The muscle of the intermediate host contains cysticerci (larval stage), not gravid proglottids.
Step 3: Note the transmission routes of tapeworms. While fecal-oral contamination can spread eggs leading to cysticercosis, the adult tapeworm infection in humans typically occurs by ingesting cysticerci in undercooked meat, not by fecal-oral transmission of eggs from human to human.
Step 4: Analyze the statement about consuming tapeworm eggs or gravid proglottids. Consuming eggs or gravid proglottids leads to cysticercosis (larval infection), not to the development of an adult tapeworm in the intestine. Adult tapeworms develop only after ingestion of cysticerci in meat.
Step 5: Conclude that the correct statement is that consuming tapeworm eggs or gravid proglottids will not lead to infection by an adult tapeworm, but rather to larval infection (cysticercosis), which is a different clinical condition.
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