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Disease Name: Amebiasis


Quick Links

Please review the Idaho Reportable Disease Rules (IDAPA 16.02.10) for the most up-to-date information.

Parasites-Amebiasis-Entamoeba histolytica Infection: http://www.cdc.gov/parasites/amebiasis/


Overview / Case Definition

Infection of the large intestine by Entamoeba histolytica may result in an illness of variable severity ranging from mild, chronic diarrhea to fulminant dysentery. Infection also may be asymptomatic. Extraintestinal infection also can occur (e.g., hepatic abscess).

Microscopy alone does not distinguish between the morphologically identical E. histolytica (pathogenic), E. dispar, and E. moshkovskii. 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.

Intestinal amebiasis

Detection of E. histolytica in stool as confirmed by EIA or PCR.

Demonstration of cysts or trophozoites of E. histolytica/dispar in stool, or in tissue biopsy or ulcer scrapings by culture or histopathology.

Extraintestinal amebiasis

Detection of E. histolytica in extraintestinal tissue as confirmed by serologic tests.

Demonstration of E. histolytica trophozoites in extraintestinal tissue.


Restrictions

Restrictions - Daycare Facility

A person excreting Entamoeba histolytica must not attend a daycare facility while fecally incontinent and must not work in any occupation in which they provide personal care to children in a daycare facility, unless an exemption is made by the Department or Health District. a. This restriction may be withdrawn if an effective therapeutic regimen is completed; or b. At least two (2) successive approved fecal specimens collected at least twenty-four (24) hours apart fail to show Entamoeba histolytica upon testing by a licensed laboratory.

Restrictions - Food Service Facility

A symptomatic person excreting Entamoeba histolytica is restricted from working as a food employee. Restrictions are designated in the Idaho Food Code.  Employees who are symtomatic with vomiting or diarrhea are excluded until asymptomatic for at least 24 hours or medically cleared.

Restrictions - Health Care Facility

A person excreting Entamoeba histolytica must not work in any occupation in which they provide personal care to persons confined to a health care facility, unless an exemption is made by the Department or Health District. a. This restriction may be withdrawn if an effective therapeutic regimen is completed; or b. At least two (2) successive approved fecal specimens collected at least twenty-four (24) hours apart fail to show Entamoeba histolytica upon testing by a licensed laboratory.

Restrictions - Household Contacts

A member of the household in which there is a case of amebiasis may not work in any occupations in Subsections 110.03 through 110.05 of this rule, unless approved by the Department or Health District. The household member must be asymptomatic and have at least one (1) approved fecal specimen found to be negative for ova and parasites on examination by a licensed laboratory prior to being approved for work.


Reporting

Within 3 working days

Reportable by Healthcare and Labs:

Reportable by Food Service Facility:

Suspect Reportable:

Reporting Timeframe: Within 3 working days



Diagnosis / Testing


Treatment


Additional Information

Parasites-Amebiasis-Entamoeba histolytica Infection: http://www.cdc.gov/parasites/amebiasis/


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