How Effective Is The Flu Vaccine? -

30%–41% effective against outpatient visits and about 30% against hospitalizations. By Flu Strain:

22%–34% effective against outpatient visits and 30% against hospitalizations. How Effective is the Flu Vaccine?

38%–41% effective against outpatient visits and 41% against hospitalizations. 30%–41% effective against outpatient visits and about 30%