Flu Vaccine Effectiveness

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There are different factors that depend on the effectiveness of the flu vaccine. Health researchers measure how well flu vaccines work through different kinds of studies, such as randomized studies and observational studies. Randomized studies are the best method for determining how well a vaccine works. The CDC work with researchers at universities and hospitals to estimate how well flu vaccine works through observational studies using medically attended laboratory-confirmed flu as the outcome. According to a CNN health article 2017 they stated that the CDC predicts the predominant virus strain this season is influenza A (H3N2) strain; the estimated effectiveness of the vaccine in preventing illness caused by that strain was 43%. The vaccine's
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