China has issued an alert in six provinces to step up vigilance following an outbreak of bird flu in South Korea, according to the agriculture ministry.
South Korea Tuesday reported its second outbreak in two weeks,with 236,000 chickens as well as pigs and dogs culled.
Heilongjiang, Jilin, Liaoning, Shandong, Jiangsu and Zhejiang provinces are all relatively close to South Korea.
The agriculture ministry said the outbreak poses a serious threat to China as the two countries are located on the same bird migratory route between East Asia and Australia.
The ministry has ordered the six provinces to dispatch more staff to monitor borders and migratory bird habitats.
Officials in Heilongjiang, Jilin and Liaoning have been ordered to work round the clock to collect and send suspicious samples to the state bird flu laboratory, according to the ministry.
Meanwhile, Hong Kong has also suspended poultry product imports from South Korea.