Chickens are sold at a a live poultry stall in Kowloon City wet market. Photo: Edward Wong
H7N9 bird flu found to spread through the air
Virus can also infect pigs, say HKU researchers, who warn officials to maintain tight scrutiny even though threat seems under control
Chickens are sold at a a live poultry stall in Kowloon City wet market. Photo: Edward Wong
