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Amebiasis

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  • Amebiasis

    The protozoan parasite Entamoeba histolytica, possibly other Entamoeba spp. Fecal-oral route, either directly by person-to-person contact (such as by diaper-changing or sexual practices) or indirectly by eating or drinking fecally contaminated food or water. A sample of returned travelers who sought health care from 2007 through 2011 at any of 53 international GeoSentinel-associated clinics showed that most people diagnosed with E. histolytica had traveled for tourism to India, Indonesia, Mexico, or Thailand, as opposed to visiting with friends and relatives or traveling for business. Nevertheless, cases of amebiasis are not restricted to these countries and are distributed worldwide, particularly in the tropics, most commonly in areas of poor sanitation.

  • Amebiasis

    Microscopy does not distinguish between E. histolytica (known to be pathogenic), E. bangladeshi, E. dispar, and E. moshkovskii. E. dispar and E. moshkovskii have historically been considered nonpathogenic, but new evidence suggests they might cause illness; E. bangladeshi has only recently been identified, so its pathogenic potential is not well understood. More specific tests such as EIA or PCR are needed to confirm the diagnosis of E. histolytica. Additionally, serologic tests can help diagnose extraintestinal amebiasis.

  • Amebiasis

    Asymptomatic patients infected with E. histolytica should also be treated with iodoquinol or paromomycin, because they can infect others and because 4%–10% develop disease within a year if left untreated. Most patients have a gradual illness onset days or weeks after infection. Symptoms include cramps, watery or bloody diarrhea, and weight loss and may last several weeks. Occasionally, the parasite may spread to other organs (extraintestinal amebiasis), most commonly the liver. Amebic liver abscesses may be asymptomatic, but most patients present with fever and right upper quadrant abdominal pain, usually in the absence of diarrhea.

 

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