Smallpox outbreak: How long would it take for vaccines to protect people? Would it work?

In the event of a smallpox outbreak in the United States, how long would it take for a vaccinSLU scientist leads national studye to start protecting Americans by stimulating an immune response?

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<p><a href="http://www.physorg.com/news97165747.html">Smallpox outbreak: How long would it take for vaccines to protect people? Would it work?</a></p> <p>In the event of a smallpox outbreak in the United States, how long would it take for a vaccinSLU scientist leads national studye to start protecting Americans by stimulating an immune response?</p>