It came as a surprise this June when the Centers for Disease Control and Prevention recommended against using the nasal flu vaccine for the 2016-2017 flu season, citing a lack of evidence that it works.
Now, findings from a Canadian study appear at first blush to contradict the researchthat led the Advisory Committee on Immunization Practices to recommend againstthat live attenuated vaccine.
But things aren't so simple. In fact, the conflicting evidence about the live nasal flu vaccine offers an excellent case study on how complex the task of analyzing flu vaccine data and making recommendations really is.
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