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.
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