Fig. 1

Incidence rates of lab-diagnosed influenza* (bottom panel) with clinical healthcare worker vaccination coverage (top panel), January 2013 to October 2018. In the bottom panel, the bars represent nosocomial influenza incidence rates corresponding to the left y-axis, while the line represents non-nosocomial influenza incidence rates corresponding to the right y-axis. * Influenza cases diagnosed 7 days or more after admission are considered to be nosocomial infections, while those diagnosed 7 days or less are considered to be non-nosocomial or community-acquire