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Giardiasis

Carol H. Hungerford, DO and Pamela R. Hughes, MD Reviewed 06/2019
 


BASICS

DESCRIPTION

  • Intestinal infection caused by the protozoan parasite Giardia lamblia:

    • G. lamblia is also called Giardia duodenalis and Giardia intestinalis.

  • Infection results from ingestion of cysts,...

DIAGNOSIS

HISTORY

  • 25–50% of infected persons are symptomatic.

  • Symptoms usually appear 1 to 2 weeks after exposure.

  • Persistent diarrhea, often >3 weeks (95%)

  • Abdominal cramps (70%)

  • Nausea (60%)

  • Bloating (...

TREATMENT

Outpatient for mild cases; inpatient if symptoms are severe enough to cause dehydration warranting parenteral fluid replacement 

GENERAL MEASURES

  • No treatment required in asymptomatic patients

  • ...

ONGOING CARE

FOLLOW-UP RECOMMENDATIONS

Patient Monitoring

Monitor symptoms, weight, and stool exams, particularly if patients fail to improve. 

DIET

Low lactose/lactose free for at least 1 month; low-fat ...

REFERENCES

1
Shane A, Mody R, Crump J, et al. 2017 Infectious Diseases Society of America clinical practice guidelines for the diagnosis and management of infectious diarrhea. Clin Infect Dis.  20...

ADDITIONAL READING

  • Cañete R, Rodríguez P, Mesa L, et al. Albendazole versus metronidazole in the treatment of adult giardiasis: a randomized, double-blind, clinical trial. Curr Med Res Opin.  201...

CODES

ICD10

A07.1 Giardiasis [lambliasis] 

ICD9

007.1 Giardiasis 

SNOMED

  • 58265007 Giardiasis (disorder)

  • 10679007 Infection by Giardia lamblia

CLINICAL PEARLS

  • Daycare facilities and public swimming pools are common sources of Giardia transmission (a history of camping or recent travel is not required for the diagnosis).

  • Abdominal bloating and...

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