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Treatment with metronidazole to prevent future symptoms, as he is infected with giardia lamblia.
46%
112/246
Treatment with azithromycin because he is infected with cryptosporidium.
10%
25/246
No treatment, as he is not currently infected with any organisms.
5%
13/246
No treatment because he is not experiencing any symptoms.
28%
69/246
No treatment because there is no effective treatment for his current pathologic state.
7%
17/246
Select Answer to see Preferred Response
Only symptomatic cases of Giardia lamblia need to be treated with metronidazole. Carriers do not need treatment unless they are high risk patients (immunocompromised). G. lamblia is a pathologic intestinal protozoan, which can present with chronic diarrhea, constipation, steatorrhea, or may be asymptomatic. The pathology involves malabsorption of ingested materials, leading to fatty, foul-smelling diarrhea. In stool smears, G. lamblia trophozoites often appear as pear-shaped and binucleate. Treatment includes one of the following: metronidazole, tinidazole, or nitazoxanide. Figure A demonstrates the characteristic findings of a stool smear seen in a patient with G. lamblia. Incorrect Answers: Answer 1: Metronidazole is the treatment of choice for symptomatic individuals infected with G. lamblia. Answer 2: The patient's stool smear is not consistent with an infection with cryptosporidium. Answer 3: Although the patient does not need treatment, he is however infected with G. lamblia. Answer 5: Although the patient does not need treatment, there are however medications that can treat it.
4.1
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