Hong Kong has confirmed its first case of the new strain of the H7N9 bird flu in a domestic worker from Indonesia.The worker, 36, recently travelled to Shenzhen in the mainland and came into contact with live poultry. She is in critical condition, officials say.
H7N9 has infected more than 100 people since it emerged earlier this year.
The case in Hong Kong is a sign that the virus may be spreading beyond mainland China, where most infections have been reported, and Taiwan.
The World Health Organization (WHO) had said there was "no evidence of sustained human-to-human transmission", but also described H7N9 as an "unusually dangerous virus".
Dr Ko Wing-man, Hong Kong's food and health secretary, confirmed the territory's first H7N9 case late on Monday.
He said that the patient "has a history of travelling to Shenzhen, buying a chicken, slaughtering and eating the chicken".
"She is now in critical condition at Queen Mary Hospital," he said, adding that four people in close contact with her were showing signs of flu-like symptoms.