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Echinococcus

Definition

Echinococcus is an infection caused by the Echinococcus granulosus or Echinococcus multilocularis worm.

Alternative Names

Hydatidosis; Hydatid disease, Hydatid cyst disease

Causes, incidence, and risk factors

Echinococcus is common in:

  • Africa
  • Central Asia
  • Southern South America
  • The Mediterranean
  • The Middle East

In the United States, the disease is very rare. However, it has been reported in California, Arizona, New Mexico, and Utah.

Humans become infected when they swallow eggs in contaminated food. The infection is carried to the liver, where cysts form. Cysts can also form in the:

  • Brain
  • Bones
  • Kidney
  • Lungs
  • Skeletal muscles
  • Spleen

Risk factors include being exposed to:

  • Cattle
  • Deer
  • Feces of dogs, wolves, or coyotes
  • Pigs
  • Sheep

Symptoms

A liver cyst may produce no symptoms for 10 - 20 years until it is large enough to be felt by physical examination.

Symptoms include:

Signs and tests

A physical examination may show signs of:

  • Abdominal pain
  • Problems with the skin and other organs
  • Shock

The following tests may be done to find the cysts:

Most often, echinococcosis is found when an imaging test is done for another reason.

Treatment

Many patients can be treated with albendazole or mebendazole. These medications are often used for up to 3 months. Another drug, praziquantel, may be helpful combined with albendazole or mebendazole.

The cysts may be removed with surgery, if possible. This can be a complicated surgery.

Expectations (prognosis)

If the cysts respond to oral medication, the likely outcome is good.

Complications

The cysts may break open (rupture) and cause severe illness, including:

  • Fever
  • Low blood pressure
  • Shock

The cysts may also spread throughout the body.

Calling your health care provider

Call your health care provider if you develop symptoms of this disorder.

Prevention

In areas where the disease is known to occur, health education and routinely removing tapeworms from dogs can help prevent the disease.

References

King CH, Fairley JK. Cestodes (Tapeworms).In: Mandell GL, Bennett JE, Dolin R, eds. Principles and Practice of Infectious Diseases. 7th ed. Philadelphia, Pa: Elsevier Churchill Livingstone; 2009:chap 29.


Review Date: 7/26/2010
Reviewed By: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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