U.S. slow to build new flu defenses

"After a lethal bird flu virus emerged in Asia, U.S. officials launched an intense effort to build new defenses against a pandemic, including replacing an antiquated vaccine system, which depends on millions of chicken eggs.

But six years later, as Americans from Washington to California line up to get inoculated against the swine flu, the slow progress toward developing better ways to make a vaccine has become glaringly obvious."

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