Study Detects Flu Immunity in Older People - washingtonpost.com

Study Detects Flu Immunity in Older People - washingtonpost.com: "Nearly two-thirds of the U.S. cases are in people between 5 and 24 years old. Less than 1 percent are in people older than 65, those most susceptible to typical seasonal outbreaks of influenza. Of the people ill enough to be hospitalized, 40 percent have been 19 to 49."