February 20, 2020
Mid-Season Flu Vaccine Efficacy
More than halfway through the 2019-2020 flu season, and the CDC estimates of vaccine efficacy are in: this year’s vaccine has been 45% effective in protecting people and keeping them out of the clinic and hospital.
In years past, effectiveness has ranged from 40%-60%. For children this season, researchers estimate that the vaccine offered 55% protection.