The public's response to the 2009 H1N1 influenza pandemic.

In April 2009, a novel influenza A (H1N1) virus emerged in the United States with the key characteristics of a pandemic virus, and within weeks it had spread to every region in the country.1 Ultimately, the rate of death was lower than was initially predicted, but the numbers of H1N1 cases, hospitalizations, and deaths were nonetheless substantial,2 and the experience offers some lessons that may help us to prepare for future influenza outbreaks. Given the crucial role that the public plays in containing or spreading illness and in seeking related medical care, we have examined the public's response to the . . .