Officials say swine flu vaccine may not be ready by fall

As the World Health Organization declared a global flu pandemic Thursday, raising the alert to its highest level, federal health officials said it was unclear whether an effective vaccine would be available by fall.

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<p><a href="http://www.physorg.com/news163991661.html">Officials say swine flu vaccine may not be ready by fall</a></p> <p> As the World Health Organization declared a global flu pandemic Thursday, raising the alert to its highest level, federal health officials said it was unclear whether an effective vaccine would be available by fall.</p>