Fig. 4From: Detecting influenza and emerging avian influenza virus by influenza and pneumonia surveillance systems in a large city in China, 2005 to 2016Temporal distributions of weekly ILI and weekly number of estimated influenza cases in two sentinel hospitals in Changsha City form week 39, 2005 to week 41, 2016. a temporal distributions of weekly ILI and influenza cases in hospital A; b temporal distributions of weekly ILI and influenza cases in hospital B. The estimated influenza cases = the number of ILI cases × the proportion of positive samplesBack to article page