Bird flu

Health officers in full protective gear wait to cross a road near a wholesale poultry market in Hong Kong.

Tyrone Siu/Reuters

Health officers in full protective gear wait to cross a road near a wholesale poultry market in Hong Kong on Tuesday.

A market inspector checks ducks at a wholesale poultry market in Ha Vy village, outside Hanoi

A market inspector checks ducks at a wholesale poultry market in Ha Vy village, outside Hanoi. Reuters/Kham

Chinese authorities slaughtered over 20,000 birds at a poultry market in Shanghai on Friday as the death toll from a new strain of bird flu mounted to six, spreading concern overseas and sparking a sell-off in airline shares in Europe and Hong Kong. Vietnam banned imports of Chinese poultry.