farm chickens can transfer sars, h7n9, h5n8 and h5n1 viruses into china, asia, europe and the usa

abstract active actual actualities actuality actually agricultural agriculture america animal animals asia bird birdlife birds box boxes business california care chicken chickens china chinese commerce commercial competition contagious danger dangerous dangers diffuse diffusing disaster disasters disease diseases epidemic europe farm farmer farmers farming farmland farms flu h5n1 h5n8 h7n9 health healthcare healthy hospital hospitals hygiene hygienic illness industries industry infection infections infectious influenza international issue issues landmark landmarks live medical medicine medicines national outbreak outbreaks poultry prevent prevention preventive problem problems public risk risks risky safe safety sars sick sickness spread spreading states threat threaten threatening threats transfer unhealthy united universal usa victims viral virus viruses world worldwide