Wood, dean of the Vanderbilt University School of Medicine and chair of the Food and Drug Administration panel that looked into Vioxx's risks in February.

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It can prevent the flu, and it can be beneficial even if you do get sick, said Dr. Bill Schaffner, chairman of the preventive medicine department at Vanderbilt University's School of Medicine.

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"We were able to estimate that a minimum of 30 percent and possibly even more than 50 percent of GBS patients had had preceding campylobacter infection, " said Dr. Ban Mishu Allos of Vanderbilt University's School of Medicine.

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