The head of Vietnam's Health Ministry's disease prevention department, Nguyen Huy Nga, told journalists two women in the country's north had contracted the virus, which makes the total number of cases registered in Vietnam this year four.
Reports in May said poultry, mainly unvaccinated ducks that died before reaching three months, had also been found to be infected with the H5N1 strain in five provinces.
Authorities in Vietnam say more than 100 million birds have so far been vaccinated, but fears of the disease spreading around the country still remains.
With the recently confirmed H5N1 death of a five-year-old Indonesian girl, the human death toll out of 307 cases around the world has risen to 186, according to the World Health Organization (WHO).
The second hardest-hit country after Indonesia is Vietnam, where 94 human bird flu cases have been registered and the death toll hit 42. Vietnam suffered damage worth $200 million, as over 40 million domestic birds, or some 15% of the total, died of the virus or were culled.
Japan, the European Union, and the World Bank pledged in April to allocate $35 million for Vietnam to fight bird flu and prevent a new pandemic in the country.
