A zoonosis that requires more than one vertebrate host (but no invertebrate) for completion of the life cycle; for example, various taenioid cestodes such as Taenia saginata and T. solium in which humans are an obligatory host; hydatid disease, a cyclozoonosis in which humans are not obligatory host.
[cyclo- + G. zōon, animal, + nosos, disease]
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The word zoonosis originates from Greek words zoion (animal) and noses (disease) and is defined as the diseases transmitted from animals to humans are called as zoonotic diseases and the phenomena is called as zoonosis.1 The phenomena of zoonosis have been classified into direct and cyclozoonosis.2 Diseases transmitted either by infected vertebrate or with a fomite or any mechanical vector is called direct zoonosis.
Cystic echinococcosis (CE) is a cyclozoonosis caused by the larval stage of the taeniid cestode Echinococcus granulosus.