We analyzed >4,000 pig samples from slaughterhouses in Cambodia and found higher influenza A seroprevalence (40.0%) and prevalence (1.5%) among pigs from commercial farms than smallholder farms (seroprevalence 8.9%; prevalence 0.6%). Multivariable analyses revealed evidence of transmission after leaving farms. Findings have implications for influenza risk and surveillance in emerging livestock systems.
Keywords: Cambodia; One Health; abbatoirs; epidemiology; farms; influenza; influenza A; low- and middle-income countries; slaughterhouses; surveillance; swine; swine flu; viruses; zoonoses.