Health officials have reported the first case of H3N2 swine flu contracted from pigs after a two-year-old girl in Long An Province in the Mekong Delta was diagnosed with the disease.
Tran Thanh Duong, deputy head of the Preventive Medicine Department, said the child was successfully treated at HCM City's Children's Hospital 1, in a press release to local media.
There was no evidence of human-to-human transmission from the child, he added.
It was also the first case of H3N2 influenza since April 2011 until when it had always spread between humans.
The Ministry of Health ordered strengthening of key flu surveillance systems and early detection of similar cases.
It will conduct an epidemiological investigation of the case together with the World Health Organisation.
The Department of Preventive Medicine advised against slaughter of sick poultry and pigs for consumption and consuming those that died of unknown causes.
When people have fever, cough, or breathing difficulty following exposure to poultry or pigs, they have to be rushed to the nearest medical facility, it said.
The US Center for Disease Control and Prevention has detected 18 people with H3N2 influenza contracted from pigs since 2009.
The ministry also warned about possible outbreaks of A/H5N1influenza, which has been reported in several provinces including Hai Phong, Hai Duong, Thai Nguyen, Ha Nam, Bac Giang, Thanh Hoa, Quang Tri, Soc Trang, and Kien Giang.