Search Field Guide
Advanced Search
MT Gov Logo
Montana Field Guide

Montana Field Guides

A Tapeworm - Echinococcus multilocularis

Native Species

Global Rank: GNR
State Rank: SNR

Agency Status


External Links

General Description
We do not yet have descriptive information on this species.  Please try the buttons above to search for information from other sources.

Echinococcus multilocularis primarily infects foxes, coyotes, or wolves as a definitive host, and rodents as an intermediate host.

Reproductive Characteristics
E. multilocularis requires two hosts to complete its life cycle. The adult tapeworm live in the intestine of the definitive host, which is typically a canine. Adult tapeworms lay eggs that are excreted with the feces of the definitive host. In many cases, the definitive host does not suffer adverse effects, even with a relatively heavy parasite burden.

The intermediate host becomes infected by ingesting eggs that were passed with the canine feces. The intermediate host is typically a rodent or occasionally a human. Once ingested, the eggs hatch in the digestive tract of the intermediate host, then enter the blood stream and are carried to organs, primarily the lung, liver, or brain, where they develop into a cyst that contains immature form of the parasite. The number of cysts that develop in an intermediate host ranges from 1 to many. Intermediate hosts with few cysts may not experience significant adverse effects whereas extremely heavy burdens may be fatal.

The parasite life cycle is completed when the intermediate host dies and another carnivore consumes the organs containing parasite cysts. Adult tapeworms again develop in the intestine of the canine definitive host, and begin laying more eggs.

Login Logout
Citation for data on this website:
A Tapeworm — Echinococcus multilocularis.  Montana Field Guide.  .  Retrieved on , from