The farm in Yen Dinh District saw several pigs dead or fall ill last Saturday.
Tests revealed they had the African swine fever, Luu Vu Lam, chairman of the Yen Dinh People’s Committee, said Monday.
The farm’s 230 pigs were then culled to prevent the disease from spreading.
No pig is allowed to be taken into or out of Tan Ngu 2 Hamlet, and disinfection work is underway, Lam added.
Previously African swine fever has been detected in the northern provinces of Thai Binh and Hung Yen and the port city of Hai Phong.
It is a viral disease that infects all pig species through bodily fluids such as blood and mucus. It causes hemorrhagic fever with a 100 percent mortality rate. There is currently no cure for it.
However, humans are not affected by the disease.
Twenty countries and territories have reported outbreaks of the disease since 2017 and over one million pigs have been culled, according to the World Organization for Animal Health.