WHO says 2 billion infected in 2 years - that's more than a quarter of everyone on Earth

AP: The World Health Organization says as many as 2 billion people could become infected over the next two years — nearly one-third of the world population. The estimates look at potential impacts over a two-year period because past flu pandemics have occurred in waves over more than one year.

WHO officials believe the world is in the early phase of the new pandemic.

SHOOT: 2 in 7 likely to get infected.

clipped from news.yahoo.com ATLANTA – U.S. health officials say swine flu could strike up to 40 percent of Americans over the next two years and as many as several hundred thousand could die if a vaccine campaign and other measures aren't successful. Those estimates from the Centers for Disease Control and Prevention mean about twice the number of people who usually get sick in a normal flu season would be struck by swine flu. Officials said those projections would drop if a new vaccine is ready and widely available, as U.S. officials expect. The U.S. may have as many as 160 million doses of swine flu vaccine available sometime in October, and U.S. tests of the new vaccine are to start shortly, federal officials said this week.