Health care workers talk at the Centers for Disease Control Emergency Operations headquarters regarding the swine flu outbreak in Atlanta, Georgia April 24, 2009. A strain of flu never seen before has killed up to 60 people in Mexico and has also appeared in the United States, where eight people were infected but recovered, health officials said on Friday. REUTERS/Tami Chappell (UNITED STATES HEALTH ENVIRONMENT SOCIETY)
REUTERS/Tami Chappell