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Ungulates like deer, elkor sheep ingest eggsas they browse...

Humans can ingest eggs by failing to follow sanitary hygenicpractices like wearing protectivebarriers like gloves and washingtheir hands well with soap andwater after possible exposureto canid feces...

Adult tapeworm in smallintestine produces eggs... Domestic dogs are a known, and very likely,

the most important source of this parasiteto human populations worldwide...

Protoscolexfrom cyst...

De�nitive Host

Intermediate Host

Scolex attaches to intestine, grows into tapeworm...

Embryonated eggsexpelled in canid feces...

Sylvatic/Pastoral Life Cycle - Echinococcus granulosusOconosphere hatches,

penetrates intestine/rumen wall...

Oconosphere isencapsulated...

Oconosphere travels inbloodstream to becomelodged in capillary beds...

Hydatid cyst is formed, usually in liver or lungs...

Canids like wolves, coyotesor dogs eat hydatid cystsin organs...

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