The deaths associated with H7N9 virus occurred in Shanghai along with three other non-lethal cases of virus infection in the city.
Also, two cases were reported in central China where the virus had not been present before, making a total count for Sunday – 11 reports.
Henan province in which the infected people where identified is located next to Beijing where a 7-year-old girl had become the first person in the capital of China to contract the virus a few days earlier.
The two men, 34-year-old restaurant worker who had been displaying flu symptoms for about a week is now in critical condition in a hospital, while a 65-year-old farmer who was in frequent contact with poultry was in stable condition after receiving treatment.
They said 19 people who had been in close contact with the two men did not show any flu symptoms.
Overall, 60 cases of the bird flu virus strain H7N9 have been identified in China up-to-date.
Head of World Health Organization's office in China, Michael O'Leary said that the people that have been infected with H7N9 "are not clustered in one small area with the same source of exposure".
"So we've been expecting new cases to occur. ... Furthermore, we still expect that there will be other cases," he added.
Meanwhile, the scientists are closely monitoring the virus's changing genome in attempt to create an efficient vaccine. Information on H7N9 genetic make-up will soon be available.
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