The highly pathogenic H5N1 strain of avian influenza has claimed the life of a bus driver in China’s Guangdong province.

The source of the virus remains unclear; however genetic analysis has revealed that this is similar to a virus found in dead migrant birds in a 2011 avian influenza outbreak in Hong Kong. It is not known if the case in Guangdong is related to migrant birds, the Shenzuan Disease Control Center has said.

The 39-year-old man from the town of Shenzhen, which borders Hong Kong, was hospitalized with pneumonia on December 21, 2011, and tested positive for the H5N1 virus. He died of multiple organ failure on December 31, 2011.