Fig. 2From: Detecting influenza and emerging avian influenza virus by influenza and pneumonia surveillance systems in a large city in China, 2005 to 2016Flowchart of detecting influenza and avian influenza virus by influenza surveillance system and pneumonia surveillance system in Changsha City, China. PSS, pneumonia surveillance system; ISS, influenza surveillance system; ILI, influenza-like illness; PCR, polymerase chain reactionBack to article page