Beijing has been rebuilding its pig herd after the virus, first detected in China in 2018, slashed pig and pork output in the world's top market.
According to a report at Today Online, industry sources have said there have been fresh outbreaks in northern and northeastern China earlier in the year. New outbreaks were also detected in the southwestern province of Sichuan.
"The control and prevention situation is still complicated, and the task remains severe," Xin Guochang, an official at the husbandry bureau of the Ministry of Agriculture and Rural Affairs, told reporters.
The risk of fresh outbreaks persisted even as the overall disease situation is stable.