Various trematodes are found as adult worms in human intestines. Examples are Fasciolopsis buski, Metagonimus yokogawai, Heterophyes heterophyes, Echinostoma sp., Gastrodiscoides sp. Most infections are asymptomatic or provoke vague abdominal symptoms. Only in severe infestations (high worm load) are there likely to be signs of malabsorption. Eosinophilia is common. Diagnosis can only be made by examining the faeces for parasites. As a general rule most of these infections can easily be treated with praziquantel.