Fig. 1From: Detecting influenza and emerging avian influenza virus by influenza and pneumonia surveillance systems in a large city in China, 2005 to 2016Locations of 49 hospitals in pneumonia surveillance system and 2 hospitals influenza surveillance system in Changsha City, China. The map depicted in this figure was taken from Wikimedia Commons (http://commons.wikimedia.org/wiki/Main_Page). PSS, pneumonia surveillance system; ISS, influenza surveillance systemBack to article page