SHENZHEN, Guangdong Province, June 13 (Xinhua) -- The Health Bureau of Shenzhen City in south China's Guangdong Province on Tuesday reported a suspected case of human infection of bird flu.

The 31-year-old man surnamed Jiang started to show symptoms of painful back, fever and cough on June 3. He was admitted to the Shenzhen People's Hospital on June 9. The patient is now in critical condition.

The Shenzhen Center of Diseases Control has tested samples of the patient to be positive of H5N1 virus nucleic acid. The Guangdong provincial health bureau has reported the case to the Ministry of Health for verification.

The patient was transferred to Donghu Hospital in the city on Tuesday for advanced treatment. His body temperature was measured at 40 degrees Celsius on Monday. Enditem