TABLE 1. Case definitions for human Cystic Echinococcosis (CE) in three countries in South America where it is a notifiable disease, 2016.

Country	Suspected case	Probable case	Confirmed case
Argentina	Two definitions: (i) A symptomatic or asymptomatic individual with a cystic mass (unique or multiple) localized in abdomen, trunk or elsewhere, and with epidemiology consistent with exposure to CE (e.g., place of origin, contact with dogs, relatives with history of CE), or (ii) An individual with a positive ultrasound.	Not defined	Any suspect case with positive imaging diagnostic tests (ultrasound, radiology, and/or computed tomography), and/or positive serology (ELISA, Western Blot, or HAI), or direct microscopic identification of the cestode parts (membranes, hooks, and protoscolex)
Chile	An individual with compatible clinical epidemiology consistent with exposure to CE, positive ultrasound, and/or serology	Not defined	Any suspected case with positive result to histopathology study or direct microscopic identification of the cestode (protoscolex)
Uruguay	An individual with one or more cystic masses in internal organs, mainly liver and lung, either asymptomatic or with manifestation via expansion, compression, occlusion, allergic reaction and/or infection, and with compatible epidemiology	Suspected case plus positive ultrasound and/or serology.	Any suspected case with positive histopathology, or direct microscopic identification of the cestode (protoscolex, hooks and/or membranes)

Source: Prepared by the authors from the published data referenced by this study.