What is the prevalence of amebiasis in the US?

Updated: Jul 19, 2019
  • Author: Vinod K Dhawan, MD, FACP, FRCPC, FIDSA; Chief Editor: Michael Stuart Bronze, MD  more...
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Answer

The overall prevalence of amebiasis in the United States is approximately 4%. E dispar infection, which is always asymptomatic, is 10 times more common than E histolytica infection. Moreover, only 10% of E histolytica infections cause invasive disease. Therefore, only 1% of persons with stool microscopy findings that reveal Entamoeba develop symptomatic amebiasis.

Certain groups are predisposed to amebic colitis, including very young patients, pregnant women, recipients of corticosteroids, and malnourished individuals. [4] In 1993, a total of 2970 cases of amebiasis were reported to the Centers for Disease Control and Prevention (CDC); 33% of cases were reported in Hispanic immigrants and 17% in immigrants from Asia or the Pacific Islands.

An increased prevalence of amebiasis is noted in institutionalized persons (especially those with mental retardation), male homosexuals, and persons living in communal settings.


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