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Disease Name: Giardiasis


Quick Links

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

Idaho Food Code (personnel section):  http://www.healthandwelfare.idaho.gov/Portals/0/Health/FoodProtection/Chapter%202%20Management%20and%20Personnel.pdf

Parasites- Giardia: http://www.cdc.gov/parasites/giardia/


Overview / Case Definition

An illness caused by the protozoan Giardia lamblia (aka G. intestinalis or G. duodenalis) and characterized by gastrointestinal symptoms such as diarrhea, abdominal cramps, bloating, weight loss, or malabsorption.

Laboratory-confirmed giardiasis shall be defined as the detection of Giardia organisms, antigen, or DNA in stool, intestinal fluid, tissue samples, biopsy specimens, or other biological sample.


Restrictions

Restrictions - Daycare Facility

A person with diarrhea who is excreting Giardia lamblia must not attend daycare while fecally incontinent or provide personal care to children in a daycare facility while the disease is present in a communicable form or until therapy is completed. An asymptomatic person may provide these services or attend daycare with specific approval of the Department or Health District.

Restrictions - Food Service Facility

A symptomatic person who is excreting Giardia lamblia must be managed under IDAPA 16.02.19, “The Idaho Food Code.” Restrictions may be lifted when the worker has been asymptomatic for at least 24 hours or has been medically cleared.

Restrictions - Health Care Facility

A person with diarrhea who is excreting Giardia lamblia must not provide personal care to persons in a health care facility while the disease is present in a communicable form or until therapy is completed. An asymptomatic person may provide these services with specific approval of the Department or Health District.


Reporting

Within 3 working days

Reportable by Healthcare and Labs:

Reportable by Food Service Facility: Yes

Suspect Reportable:

Reporting Timeframe: Within 3 working days



Diagnosis / Testing

Because Giardia cysts can be excreted intermittently, multiple stool collections (i.e., three stool specimens collected on separate days) increase test sensitivity. The use of concentration methods and trichrome staining might not be sufficient to identify Giardia because variability in the concentration of organisms in the stool can make this infection difficult to diagnose. For this reason, fecal immunoassays that are more sensitive and specific should be used.

Rapid immune-chromatographic cartridge assays also are available but should not take the place of routine ova and parasite examination. Only molecular testing (e.g., polymerase chain reaction) can be used to identify the subtypes of Giardia.


Treatment


Additional Information

Idaho Food Code (personnel section):  http://www.healthandwelfare.idaho.gov/Portals/0/Health/FoodProtection/Chapter%202%20Management%20and%20Personnel.pdf

Parasites- Giardia: http://www.cdc.gov/parasites/giardia/


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