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Researchers Step Up Efforts To Develop A 'Universal' Flu Vaccine

Most efforts to develop a universal flu vaccine have focused on the lollipop-shaped hemagglutinin protein (pink in this illustration of a flu virus). (Science Photo Library/Getty Images)
Most efforts to develop a universal flu vaccine have focused on the lollipop-shaped hemagglutinin protein (pink in this illustration of a flu virus). (Science Photo Library/Getty Images)

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