Fig. 3From: Risk factors for avian influenza virus in backyard poultry flocks and environments in Zhejiang Province, China: a cross-sectional studya. Prevalence of avian influenza A in backyard poultry and environments from 2015 to 2017. b. Prevalence of avian influenza subtypes (H5, H7, H9) in backyard poultry and environments from 2015 to 2017Back to article page