Which antibiotic is NOT used to treat giardiasis?

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Multiple Choice

Which antibiotic is NOT used to treat giardiasis?

Explanation:
Giardiasis is caused by a protozoan, and the drugs used to treat it are targeted to protozoal metabolism rather than bacterial cell walls. Amoxicillin is a beta-lactam antibiotic that inhibits bacterial cell wall synthesis and has no activity against protozoa like Giardia. Because the organism is a eukaryotic parasite without a bacterial cell wall, amoxicillin won’t clear the infection. In contrast, metronidazole and tinidazole are nitroimidazoles that damage Giardia’s DNA, and nitazoxanide disrupts a parasite-specific energy pathway, all of which are effective against giardiasis. So the medication not appropriate for this infection is amoxicillin.

Giardiasis is caused by a protozoan, and the drugs used to treat it are targeted to protozoal metabolism rather than bacterial cell walls. Amoxicillin is a beta-lactam antibiotic that inhibits bacterial cell wall synthesis and has no activity against protozoa like Giardia. Because the organism is a eukaryotic parasite without a bacterial cell wall, amoxicillin won’t clear the infection. In contrast, metronidazole and tinidazole are nitroimidazoles that damage Giardia’s DNA, and nitazoxanide disrupts a parasite-specific energy pathway, all of which are effective against giardiasis. So the medication not appropriate for this infection is amoxicillin.

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