Taipei - Taiwan on Monday was checking at least seven suspected cases of swine flu while issuing a travel alert for Mexico.  A Taiwan man was being tested while six students from the Taipei American School were taken to another hospital after they reportedly developed symptoms upon returning from Mexico and the United States.

   Era TV reported that the students from the Taipei American School fell ill after a trip to the US, and were put into the Tri Service General Hospital for tests.

   The 32-year-old man visited Mexico April 24-26 and began to show symptoms while returning home Sunday via Canada, other press reports said.

   He reportedly visited two regions in Mexico where the swine flu has broken out.

He visited Taoyuan Hospital near Taipei on Monday afternoon. Doctors at the Centres for Disease Control (CDC) said they doubted that he had swine flu.

   "But we have to wait and see the test results which will come out in a few hours," CDC director-general Shih Wen-yi told a news conference.

   Taiwan on Sunday stepped up quarantine for travellers from Mexico and North America and on Monday issued an alert against travelling to Mexico.