Which stage of Giardia duodenalis is usually acquired by a susceptible animal from contaminated water?
Correct answer: B. The resistant cyst
- A. The feeding trophozoite
- B. The resistant cyst
- C. The immature oocyst
- D. The tissue schizont
Explanation
The resistant cyst survives outside the host and is the infective stage ingested in contaminated water or food. Trophozoites multiply in the intestine but are fragile and do not commonly survive environmental exposure.
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Covers protozoa, helminths and arthropods that infect domestic animals, including their morphology, life cycles, hosts, transmission and clinical effects. Questions connect parasite identification with diagnosis, prevention and treatment, and distinguish endoparasites from ectoparasites and definitive hosts from intermediate hosts.
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