Despite vaccinations, influenza remains a serious health hazard, affecting 30 million to 50 million Americans each year. Influenza accounts for millions of days lost from work or school, 85,000-500,000 hospital admissions and, on average, 36,000 deaths each year, according to U.S. government statistics.

This year has brought on a particularly harsh flu season, because the current vaccine prevented only 40 percent of flu-causing strains of the virus — down from the 70 to 80 percen ...

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