More than 20,000 chickens were killed in an outbreak of H7N9 bird flu in Shaanxi Province, China.
A statement from the local government said that the virus spread within the Yuyang Lyuxiangyuan Eco Co., Ltd., a private poultry company located at Niujialiang Township.
Chickens started dying on May 25. Areas within the three-kilometer radius were closed for disinfection and will remain that way for 21 days.
All poultry within the area will be culled and all poultry trading sites in the area have been closed.
H7N9 is a bird flu strain first reported to have infected humans in China in March 2013. Infections are most likely to strike in winter and spring.
According to the National Health and Family Planning Commission, 96 H7N9 infections and 47 deaths were reported nationwide in March and 81 infections and 24 deaths in April.