Table 2. Definition of influenza-like illness (ILI) and severe acute respiratory syndrome (SARS).

Classification	Clinical characteristics
ILI	Respiratory symptoms, such as cough, runny nose, sore throat, with or without fever*
SARS	O2 saturation <95% on room air AND/OR respiratory rate ≥24 bpm

^*Fever may not be present in some cases, such as elderly and immunocompromised patients, when the clinical assessment should be taken into consideration.