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Flu surge endangers youth
Influenza is spreading early this year, and the H1N1 strain is dominant. But an early start does not necessarily mean the season will be severe. Preliminary laboratory data point to a mutation that may help the virus evade antibodies in adolescents and young adults, potentially making them more susceptible to infection than in previous seasons. Experts link this to immune imprinting: many in these age groups were first exposed to the H1N1 strain in 2009, and their antibodies target a region affected by the new mutation.
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