Ho Chi Minh City’s Tan Son Nhat International Airport Quarantine Center on May 21 tested four passengers with fever. Two were found negative with A/H1N1, and findings for the other two were not available by the end of the day.

On May 20, the center tested 14 passengers who suffered high fever. Eleven of them people were allowed to leave hospital after they tested negative for the influenza A/H1N1 virus. However, health officials keep surveillance on them as they went on the same flight with Le Thi Bich who had earlier been found to have the H1N1 virus and quarantined in South Korea.
 
Meanwhile, one of the passengers who traveled on the same flight OZ 271 with was taken to the General Hospital of Danang City on the central coast with symptoms of sore throat and fever on May 21, Danang Department of Health deputy director Nguyen Ut announced.

According to the World Health Organization, as of 06:00 GMT, 21 May, 41 countries have officially reported 11,034 cases of influenza A/H1N1 infection, including 85 deaths.

In Vietnam, 15,859 passengers on May 20 entered the country including 340 people from the U.S, 219 from Mexico and 3,751 from affected nations. Vietnam has quarantined 63 suspect people who were all negative for the flu virus.

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