Fig. 1
From: Clinical characteristics and outcomes during a severe influenza season in China during 2017–2018
Surveillance sites and spatial-temporal distribution of influenza investigated in comparison to nationwide incidence. a Map showing the five alliance hospitals and their catchment area in Zhejiang. b Nationwide incidence of influenza; (c) Distribution of hospitalized cases by influenza subtypes by year from 2011 to 2018; (d) Distribution of hospitalized cases by influenza subtypes by month from July 2017 to June 2018