Influenza of avian origin confirmed in a sheep in Yorkshire, UK A single sheep in Yorkshire, England, UK tested positive following repeat milk testingThe UK’s Chief Veterinary Officer has confirmed a case of influenza of avian origin (H5N1) in a single sheep in Yorkshire following repeat positive milk testing, according to the UK government Department for Environment, Food & Rural Affairs and Animal and Plant Health Agency. The case was identified following routine surveillance of co-located livestock on a premises where avian influenza had been confirmed in captive birds. Defra has introduced livestock surveillance on infected premises following the outbreak of avian influenza in dairy cows in the US. No further infection with avian influenza virus was detected in the remaining flock, and this remains a single case in a mammal detected on the premises. UK Chief Veterinary Officer Christine Middlemiss said: “We have confirmed the detection of influenza of avian origin (H5N1) in a single sheep on a farm in Yorkshire.