Both patients are suspected of contracting avian influenza strain A, also known as H5N1, Dau Ngoc Hao, deputy director of the Agriculture Ministry's Veterinary Department in Hanoi, told Reuters.
They were among 15 people who fell ill with influenza in Hanoi and surrounding provinces.Twelve, most of them children, have died. The World Health organization
said on Tuesday tests conducted by a Hong Kong laboratory had confirmed that bird flu killed three of the 15. Hao
suspected pigs were playing a role in the transmission of bird flu to humans.
"It is possible that the bird flu virus spreads from chickens to pigs before jumping on humans," he
said, but did not elaborate.