Figure 1.

Overview of RSV-SARI notifications and seasonal patterns in Brazil since 2013.

Data reflect weekly number of RSV positive SARI cases reported in the SIVEP-Gripe database for 2013–2019 and 2020–2022 (and early 2023). The broad pattern is that of an increasing number of cases reported each year. Prior to COVID-19, RSV activity typically begins from March onwards, peaking through May to June. In 2020, case numbers fell substantially, with a resurgence in case numbers in 2021 and particularly 2022 onwards. RSV activity in these years shows a different pattern, with an initial peak in March/April followed by a subsequent increase in the latter part of the year.

Abbreviations: COVID-19; coronavirus disease 2019; RSV; respiratory syncytial virus; SARI: severe acute respiratory infection