Echinococcus Antibody IgG test is a serological test used to diagnose antibodies to Echinococcosis (also known as hydatidosis), a disease caused by Echinococcus, a species of tapeworm. Patients suffering from Echinococcosis develop cysts in the lungs and the liver. Undiagnosed, the disease may remain silent or latent for years if not diagnosed. The symptoms of Echinococcosis are chest pain, cough for lung cysts, abdominal pain and biliary duct obstruction for liver cysts.