US wants ingredient in swine flu vaccine by May

(AP) -- U.S. scientists hope to have a key ingredient for a swine flu vaccine ready in early May, but tell The Associated Press that the novel virus grows slowly in eggs - the chief way flu vaccines are made.

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<p><a href="http://www.physorg.com/news160140577.html">US wants ingredient in swine flu vaccine by May</a></p> <p>(AP) -- U.S. scientists hope to have a key ingredient for a swine flu vaccine ready in early May, but tell The Associated Press that the novel virus grows slowly in eggs - the chief way flu vaccines are made.</p>