Vaccine effectiveness for the prevention of flu-associated hospitalizations was similar to vaccine effectiveness against flu illness resulting in doctor’s visits in a comparative study published in 2016 flu vaccination is an important preventive tool for people with chronic health conditions. At the end of that same year, a centers for disease control and prevention (cdc) analysis 2 of flu vaccine effectiveness revealed that, between 2005 and 2015, the influenza vaccine was actually less than 50 percent effective more than half of the time i wonder if the reality might be even worse than that.
The seasonal flu shot is a yearly vaccine administered to protect against the flu, or influenza in the united states, flu shots are recommended for everyone ages 6 months and older, according to the centers for disease control and prevention.
Vaccine effectiveness varies year on year as the flu virus changes and is difficult to predict last winter’s flu vaccine provided good protection against a(h1n1)pdm09 and good protection for the quadrivalent vaccine in children against the main flu b strain which circulated last season. 1 how effective is the 2018 flu shot early findings from canada indicate a 17 percent effectiveness against the viral strain, known as h3n2, that’s been the main culprit of flu in the us this winter 2 why are vaccines less protective against some strains of the flu one reason has to do with the most-common way flu shots are made.
An analysis of influenza vaccine effectiveness reveals that, between 2005 and 2015, the flu vaccine was less than 50 percent effective more than half of the time recent studies show that, with each successive annual flu vaccination, the protection afforded by the vaccine appears to diminish.