ATLANTA, Dec. 2 (UPI) -- Inadequate use of masks or respirators put U.S. healthcare workers at risk of 2009 H1N1 flu during the earliest stages of the 2009 pandemic, researchers say.
The study was led by researchers at the Centers for Disease Control and Prevention in Atlanta, who tracked 63 Southern California healthcare workers who had contact with six of the first eight laboratory-confirmed 2009 H1N1 cases detected in the United States.