Figure 2.

Age‐specific incidence rates of RSV‐LRTI and distributions of followed up child‐years in children aged less than 5 y in Biliran cohort study from April 2014 to March 2016. LRTI, lower respiratory tract illness; RSV, respiratory syncytial virus. The proportion of severe episodes was calculated as proportion of the total severe RSV‐LRTI episodes among total RSV‐LRTI by every 1 y of age. Incidence rates were calculated for 2 mo of age and every 3 mo of ages from 3 to 59 mo of ages. Child‐years were calculated for every 3 mo of ages. The child‐years during RSV epidemic period is shown as dark grey in background, and light grey shows child‐years out of RSV epidemic period. The epidemic periods were defined as May 2014‐January 2015 and October 2015‐January 2016 during the study period of April 2014‐March 2016. Whiskers show 95% confidence interval of incidence rate for whole RSV‐LRTI in each age group