存在多种病例定义：
WHO: public health surveillance for COVID-19 – interim guidance external link opens in a new window
CDC: coronavirus disease 2019 (COVID-19) 2020 interim case definition external link opens in a new window
PHE: COVID-19 – investigation and initial clinical management of possible cases external link opens in a new window
ECDC: case definition for coronavirus disease 2019 (COVID-19) external link opens in a new window
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