A 39-year-old man has died in southern China from the H5N1 avian influenza virus, the second case in less than a month, according to the country's Health Ministry.

The unidentified man was admitted to the hospital on January 6 and had not reported any exposure to poultry in the month before his illness. Chinese authorities, who are monitoring 71 people known to have been in contact with the man, have not found any evidence of the virus.

The previous case involved a 39-year-old bus driver who died on December 31, 2011, and had also reported no contact with birds prior to his illness.