Table 1. Description of influenza-like illness and severe respiratory illness facility-based surveillance, South Africa, 2013–2020.

Province	Number of surveillance sites	Period of surveillance	Surveillance case definition
Influenza-like illness surveillance in public health clinics
North West	1	2013–2020	An outpatient of any age presenting with either temperature ≥ 38 °C or history of fever and cough for a duration of ≤ 10 days.
KwaZulu-Natal	1	2013–2020
Western Cape	2	2018–2020
Severe respiratory illness surveillance in public hospitals
North West	2	2013–2020	A hospitalised person with symptoms of any duration who met age-specific clinical inclusion criteria: • Children aged 2 days to < 3 months: diagnosis of suspected sepsis or physician-diagnosed acute lower respiratory tract infection irrespective of signs and symptoms. • Children aged 3 months to < 5 years: physician-diagnosed acute lower respiratory tract infection, including bronchitis, bronchiolitis, pneumonia and pleural effusion. • Individuals aged ≥ 5 years: manifestation of acute lower respiratory tract infection with fever (≥ 38 °C) or history of fever and cough.
KwaZulu-Natal	1	2013–2020
Mpumalanga	2	2013–2020
Gauteng	2	2014–2020
Western Cape	2	2015–2020