Hong Kong officials on Monday confirmed two new cases of swine flu, raising the city's total number of infections to nine.
The two patients, a four-year-old boy and his 18-month-old sister, arrived on a flight from New York on Sunday, the city's health department said, appealing for other passengers on the plane to come forward.
The latest cases came nearly three weeks after officials here confirmed Asia's first case of the A(H1N1) virus, sparking a week-long quarantine for around 300 hotel guests and staff in the city.
More than 12,500 cases and 91 deaths have been recorded worldwide since A(H1N1) influenza emerged in Mexico and the United States a month ago.
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