Swine Flu Shot Campaign Could Involve 600 Million Doses
Officials are also looking at how to keep track of side effects if it's given at the same time as the seasonal vaccine. That could make it difficult to figure out which vaccine was causing the side effects.
At a Friday meeting of a national vaccine advisory committee, officials said a swine flu campaign could far eclipse the roughly 115 million doses of seasonal flu vaccine and the 150 million doses of childhood vaccines distributed each year.
Although about 300 million people live in the U.S., health officials say children and some adults may need two doses of the vaccine.