Some 261 pigs belonging to 19 households in six communes have been culled following an outbreak of foot-and-mouth disease (FMD).
The outbreak is believed to be linked to unvaccinated cattle.
Local veterinary units have initiated cattle vaccinations in the area and disinfected the infected farms to control the spread of the disease.
The health ministry on Friday reported six FMD disease outbreaks nationwide. All of them were in Ba Vi District, two and a half hours from Hanoi.
The serotypes commonly found in Vietnam are O and A