WHY FLU VACCINES ARE LESS EFFECTIVE CERTAIN YEARS

According to the CDC, vaccine effectiveness during the 2015-2016 flu season was 47%, but for the 2014-2015 season, effectiveness was just 19%.  Variances in effectiveness from year to year can be caused by a variety of factors. As detailed in prior blog entries, each year before the flu season begins, a vaccine is made based… Read more »