Fig. 2From: Correlation between national surveillance and search engine query data on respiratory syncytial virus infections in JapanCorrelation between sentinel surveillance data and relative search volume on Google Trends per year. The correlation coefficient was 0.87, 0.83, 0.83, and 0.96 for 2018, 2019, 2020, and 2021, respectively. The sentinel surveillance data were expressed as the number of laboratory-confirmed cases per sentinel siteBack to article page