| http://www.w3.org/ns/prov#value | - Those trials will determine whether one or two doses will be needed to provide immunity.Five companies are making swine flu vaccine for the U.S. market -- AstraZeneca's MedImmune unit, CSL Ltd, GlaxoSmithKline Plc, Novartis AG and Sanofi-Aventis SA.Seasonal flu infects between 5 percent and 20 percent of a given population every year, but 90 percent of severe cases and deaths are among the elderly
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