BEIJING - Eleven Chinese people were confirmed to be infected with the H7N9 bird flu on Wednesday in four regions, with 8 in critical condition, according to local health authorities.

The southern province of Guangdong reported 4 new cases, including a 5-year-old girl and a 42-year-old man in Zhaoqing City, a 49-year-old man in Foshan City and a 56-year-old man in Shenzhen City, said the provincial health and family planning commission.

The girl and the man from Foshan are in stable condition while the other two remain in critical condition, according to the commission.

The eastern province of Zhejiang, the region hit hardest by the H7N9 virus, confirmed four new human cases on Wednesday, bringing the total number of affected cases to 69 in the province so far this year, said the provincial health and family planning commission.

The patients were two men and two women, all in critical condition, according to the commission.

Two new cases were reported in Hengxian County in Guangxi Zhuang Autonomous Region, according to the regional health and family planning commission. They were a 41-year-old woman, in critical condition, and his 5-year-old son.

A 36-old man in Quanzhou City of east China's Fujian Province was confirmed to be infected with the virus on Wednesday. He is in critical condition, according to the provincial health and family planning commission.

Chinese health authorities on Wednesday reaffirmed no proof has been found that the H7N9 virus is spreading from human to human.

Most human H7N9 infection cases have been isolated so far, said a statement from the National Health and Family Planning Commission.

During the Spring Festival holidays, expert teams sent by the commission have been supervising local hospitals in Beijing, Shanghai, Zhejiang, Fujian and Guangdong in diagnosing and treating H7N9 patients, the statement said.

Health authorities and hospitals in provinces with high incidence of H7N9 are working hard to identify H7N9 cases as early as possible, it said.

The health authorities will strive to prevent cases of severe infection and reduce casualties, it added.