Eighteen people, including 14  that shared a plane with a woman who had been found to have the H1N1 flu virus and quarantined in South Korea, have tested negative for virus, said Dr. Phan Van Nghiem from Ho Chi Minh City Department of Health on May 22.
 
They were allowed to return home, with two US citizens completing formalities to return to their country on May 23.
 
The director of Ho Chi Minh Department of Health, Nguyen Van Chau, announced that seven passengers with high fever and placed in quarantine have also tested negative for the influenza A/H1N1 virus.
 
Vietnam has yet to report any cases of the flu.
 
Related articles:
More travelers with H1N1 flu suspect in quarantine
Vietnam-bound tourist tests positive for swine flu in Korea