Of the new cases, 28 are from the southern region, two from the northern region and two from the central region, according to the Health Ministry.

The central southern and central highlands provinces of Khanh Hoa, Ba Ria Vung Tau and Lam Dong detected new cases among students who came back from Ho Chi Minh City to their hometowns for summer vacation.

In the whole country there have been 475 cases of the H1N1 influenza but no fatalities report so far. Up to 70 percent of the total (332) have been successfully treated. The remaining 143 are now being kept in isolation but all are in stable condition, the ministry said.

There have been 143,841 confirmed cases of the flu around the world, of which 813 are fatal, said the European Centre for Disease Prevention and Control (ECDC) on July 22.