Trinh Quan Huan, Vietnam's vice minister of health, center, talks to hospital staff members concerning preparations to fight against swine flu, at a hospital in Ho Chi Minh City, Vietnam on Monday, June 1, 2009. An American woman of Vietnamese origin and her 9-year-old son who recently returned from the U.S. have tested positive for swine flu, bringing the country's total cases to three, doctors said Monday.