A/Guangdong/1057/2010(H1N1), H3N2 canine influenza virus A/canine/Guangdong/2/2011(H3N2), and H9N2 avian influenza virus A/chicken/Guangdong/V/2008(H9N2). These viruses were isolated and typed by the College of Veterinary Medicine, South China Agricultural University. We performed descriptive statistics and bivariate analysis to explore potential risk factors for serological assay outcomes.