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Among the 90 samples collected from people who worked in hotel and discotheques in Pattaya, 21 of them were confirmed to be positive to the flu.

The collection of the samples were conducted after two Taiwanese who visited Pattaya were found infected by the flu when they returned home.

"All 21 cases which were found positive to the flu were staffs of a discotheque in Pattaya," he said.