sign at the entrance of a farm in germany with the inscription restricted area avian influenza

agriculture animal area avian barrier bird closed contagion danger disease domestic entrance epidemic epizootic farm farming flu geflügelpest germany h5n1 husbandry ill illness indicating infection infectious influenza info information inscription killing label locked measure outbreaks pandemic pathogen pest pet precautionary quarantine regard restricted risk safety security shut sign sperrgebiet veterinarian veterinary virus warning wild zone