Health officials estimate that as many as 1 million Americans now have the new H1N1 (swine) flu.
Lyn Finelli, a flu surveillance official with the Centers for Disease Control and Prevention, voiced the estimate at a vaccine advisory meeting Thursday in Atlanta.
The estimate is based on mathematical modeling. Nearly 28,000 U.S. cases have been reported to the CDC, accounting for roughly half the world's cases. The U.S. count includes 3,065 hospitalizations and 127 deaths.