South China's Guangdong Province reported another two human cases of H7N9 avian flu, local health authorities said Saturday.
At least 15 human cases have been reported in the province this month.
The two patients, a 46-year-old man from Meizhou City and a 77-year-old man from Chaozhou City, were confirmed infected on Friday and are in a critical condition, the provincial health and family planning commission said in a statement.
People are most at risk from bird flu during winter and spring.
In addition to Guangdong, Shanghai, Fujian and Zhejiang along the eastern Chinese coast have all reported human cases of H7N9 this winter.