Fig. 6From: Seasonality of respiratory syncytial virus infection in children hospitalized with acute lower respiratory tract infections in Hunan, China, 2013–2022The predictions of year effect on the weeks of the average percentage of respiratory virus antigen tests positive for RSV per week in 2013–2022, as obtained from the non-linear ordinary least squares regression model. The graph begins at calendar week 27. Season onset and offset are indicated by the 2 orange vertical lines. The non-linear ordinary least squares regression model indicated that the year effect on the weeks of epidemic clusters was statistically significant (P-value < 0.001, Fig. 6). Thus, the epidemic season has changed. RSV activity in 2020–2021, resurgence during the summer and autumn, started earlier by 12 weeks when compared with the predictions of year, peaked later (the 7 week), and lasted longer. RSV activity in 2021–2022, started earlier by 18 weeks when compared with the predictions of year, peaked and offset within the predicted rangeBack to article page