China warned Wednesday it faced a growing risk of swine flu infections despite officials elsewhere saying the virus was on the wane, state media reported.

"Chinese medical experts believe the global epidemic situation is still worsening and China has to give continued high attention," Vice Health Minister Zhang Mao told a video conference on the prevention and control of the disease, according to the official Xinhua news agency.

The only confirmed case in China so far has been in the southern territory of Hong Kong but officials in Beijing are taking extreme measures to stop influenza A(H1N1) making its way to the mainland.

A group of Chinese nationals who had been stranded in swine flu-hit Mexico returned home on Wednesday — and were immediately quarantined, the Shanghai government said.

All 119 passengers and crew on a government-chartered Boeing 777 were isolated after arriving at Shanghai's Pudong International Airport, a local government spokesman told AFP.

Zhang was quoted by Xinhua as saying the slowing increase in new cases globally might be due to the active prevention measures most countries have taken.

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