Echinococcus IgM test is a simple blood test that helps detect tapeworm disease in humans early, especially in the early stages of Echinococcus infection (also known as hydatidosis or cystic echinococcosis).Tapeworm disease, also known as cystic echinococcosis, is a parasitic infection caused by the larval stage of the tapeworm Echinococcus. Humans can become infected by accidentally swallowing tapeworm eggs, usually through contact with the feces of infected animals (mainly dogs and wild animals such as foxes and wolves). This test looks for a specific antibody(IgM) that appears in the blood when the body is newly infected with tapeworms. IgM antibodies usually appear earlier than other antibodies after infection, so this test is especially useful in diagnosing the early stages of Echinococcus infection.