At Germany's biggest air hub Frankfurt international airport, airline crews on jets coming from swine-flu-affected areas were instructed to report any sick passengers.

The Health Ministry of Cambodia planned to set up scanners at the Phnom Penh and the Siem Reap international airports to check travelers' body temperature against the possible entry of swine flu.

Cambodian health officials said all people who once traveled to the infected areas will be observed.

A string of countries including Norway, Sweden, Australia, Israel, France and Guatemala were testing suspected cases of the Mexican flu.

The Chinese Ministry of Health (MOH) has required local authorities to immediately organize experts to provide medical consultations and treatment at designated medical institutions if people were suspected to have contracted the virus, and has ordered medical institutions at all levels to step up monitoring of suspected swine flu cases, and to report them to the ministry promptly.

According to MOH spokesman Mao Qun, a diagnostic reagent for use in testing for swine flu is under development in China, and the research on a possible vaccine and medication to combat the deadly virus is also underway.

UN Secretary-General Ban-Ki moon told reporters the H1N1 swine flu is of "the most serious concern" to the international community, including the United Nations.

"We are concerned that this virus could cause a new influenza pandemic...It could be mild, in its effects, or potentially severe," he said.

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Editor:Yang Jie