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ClinQuiz: Parasitology - Answer 2A

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ClinQuiz

2A) Correct. Figure 1 shows Giardia species cysts, which can be identified by their small size (10 to 15 µm), an internal axostyle, and two or four nuclei. Fenbendazole is considered the treatment of choice for giardiasis in dogs. The efficacy of fenbendazole in published studies is greater than 90%, compared with the relatively poor efficacy of metronidazole.4-6 Febantel, a probenzimidazole that is metabolized to fenbendazole after ingestion, is also effective.7 Removing Giardia species cysts from the environment through the careful cleaning of fecal-contaminated areas and bathing of dogs immediately after treatment may be necessary to prevent reinfection.6

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