China has detected an outbreak of bird flu in Hunan, which shares its border with Hubei province, the epicenter of coronavirus. The illness, known as H5N1 virus, was first detected in a farm in the Shaoyang city Saturday and has killed 4,500 chickens. Authorities have further culled 17,828 poultry to contain its spread.The flu can be transmitted to humans, but no such case has been reported yet.