The National Hospital for Tropical Diseases reports that it is treating between 130-140 patients each day.
One who was infected with the A/H3N2 virus died.
Hospital tests show that the viruses, which spread quickly via the respiratory system, can cause pneumonia and perhaps death.
National Institute of Hygiene and Epidemiology scientists say it is difficult to identify the various seasonal flu viruses because they change each year.
Tropical diseases hospital deputy director Nguyen Hong Ha said most patients recovered within two or three weeks.
But the elderly, pregnant women and children could be at risk if they were not treated promptly.
The hospital's Dr Nguyen Trung Cap advised those who thought themselves infected to go to medical clinics for examination rather than try to "self-treat" themselves with drugs.
People are advised to practise personal hygiene and wear masks in crowds or when talking with those already infected.
Symptoms include headaches, sneezing and coughing. — VNS
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