Across the World: United States

H1N1 has killed 10,000

H1N1 flu has killed nearly 10,000 Americans, including 1,100 children and 7,500 younger adults, and infected one in six people in the United States since arriving last April, health officials said on Thursday.

"What we've seen for months is this is a flu that is much harder on younger people," Dr. Thomas Frieden, director of the US Centers for Disease Control and Prevention, told a media briefing.