Blue ear disease has hit at least 15,000 pigs in six northern and central locales since the illness reared its head again early this month.
According statements made by the Animal Health Department Friday, nearly half of the sick pigs have died of the disease or been destroyed by local health agencies or farmers in the six provinces and cities.
Last June, the department said that Vietnam had successfully curbed the spread of foot-and-mouth disease, bird flu and the blue ear pig disease. But blue ear cropped up again in Hai Duong province April 3.
In other health news, Minister of Health Trinh Quan Huan on Friday ordered the National Institute of Hygiene and Epidemiology to study changes in cholera bacteria that have caused recent outbreaks in five provinces and cities, including Hanoi and Ho Chi Minh City.
The ministry wanted to know if the current strain was the same as that which sickened hundreds of people during severe cholera outbreaks in northern Vietnam in 2008 and 2009, according to Huan.
Vietnam has recorded 21 cases of the disease this year. HCMC has been the worst hit locale with nine cases reported so far.