Experts say that even if cases of the new swine flu disappear with warm weather, the virus may return — perhaps with a vengeance — next winter.
In light of that threat, the Obama administration appears close to announcing a decision to make a vaccine against swine flu as early as this fall.
Normally, it takes six months to make a regular flu vaccine. An effective vaccine protects most people from getting the flu. It would be the primary weapon against a flu pandemic — if it can be made, distributed and put into people's arms in time.
Bruce Gellin, the nation's top vaccine official, says the plan is to make enough swine flu vaccine for all 304 million Americans. The first doses could be available in September — only five months from now.