Local authorities in South China's Guangdong Province have reported two more H7N9 bird flu infections in humans in the city of Shenzhen.
A 57-year-old woman is in critical condition while a 41-year-old man is listed in stable condition.
Health authorities have warned that the province has entered a high-incidence period for avian flu, which occurs in winter and spring, and risks for occasional human infections are high.
In the meantime, a patient in Xiamen, Fujian Province, has died of the H7N9 virus, while another 4 human infections have also been confirmed.
One person has already recovered while the other three remain in a critical condition.
