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    <subfield code="a">Ahonkhai, Aima A. </subfield>
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    <subfield code="a">Case 20-2026: A 38-year-old man with abdominal pain</subfield>
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    <subfield code="a">p&#xE1;ginas: 291-300</subfield>
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    <subfield code="a"> A 38-year-old man was evaluated at an outpatient clinic of this hospital because of abdominal pain. The patient had been in his usual state of good health until 6 weeks before the current presentation, when watery diarrhea (up to 20 episodes per day), accompanied by fever, chills, nausea, and vomiting, developed during a 3-week trip to rural Madagascar for work. Episodes of diarrhea started approximately 1 week after he arrived in Madagascar and lasted for 3 days, during which time he had limited food intake. The symptoms then gradually resolved, and he reported feeling well for 3 days afterward; however, the diarrhea then recurred. He received a single oral dose of levofloxacin, and the diarrhea resolved after 2 days. He returned to Massachusetts and then took a brief trip to Texas.</subfield>
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    <subfield code="a">Heller, Howard M.</subfield>
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    <subfield code="a">Schrader, Sarah M. </subfield>
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    <subfield code="d">Massachusetts NEJM Group</subfield>
    <subfield code="o">NEJM003</subfield>
    <subfield code="t">The New England Journal of Medicine </subfield>
    <subfield code="w">ESSALUD</subfield>
    <subfield code="x">0028-4793</subfield>
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    <subfield code="e">2026-07-31</subfield>
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