Questions raised about effectiveness of...

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The flu vaccine FluMist, which is made by Gaithersburg-based MedImmune Inc., is at the center of a new debate over vaccinations for the upcoming flu season. In June, a Centers for Disease Control and Prevention advisory committee recommended health providers not use the “nasal spray” flu vaccine produced by MedImmune, a subsidiary of U.K. pharmaceutical giant AstraZeneca PLC (NYSE: AZN). Officials from the CDC cited data showing poor or relatively lower effectiveness of that vaccine, which contains…