The World Health Organization (WHO) reported that two men aged 87 and 27 in Shanghai have died and a 35-year-old woman in nearby Anhui province is in critical condition after contracting the virus on March 29.
Local authorities of Zhejiang province also announced another human death of the virus on April 3.
The Chinese Centre for Disease Control and Prevention (CDC) said all the victims had tested positive for the H7N9 virus, negative for the H3N2, H1N1 and H5N1 and the new type of corona viruses.
These were the first human cases of H7N9 infection ever recorded, but there was no evidence of virus transmission from people to people, the centre said.
Although the new strain has yet to be found in Vietnam, the Ministry of Health has asked its medical agencies to take effective measures to prevent the spread of the new disease in the country.
In an urgent telegram dated April 3, the ministry instructed local health departments and institutes of hygiene and epidemiology to cooperate closely with local administrations to step up monitoring, early detect and promptly deal with new outbreaks of poultry diseases.
The designated agencies were asked to intensify quarantine work in the border areas and keep a close watch on visitors, especially those coming from affected areas outside Vietnam. They were all required to immediately provide medicines and emergency treatments if a possible epidemic breaks out.
In another telegram issued the same day, the Ministry of Health proposed that the Ministry of Agriculture and Rural Development and the Ministry of Trade tightly control the import of poultry through the border gates to prevent non-quarantined poultry and related products from entering Vietnam.