How Effective is the Flu Vaccine? Since health officials started tracking it in 2003, effectiveness of the flu shot has varied from year to year, averaging at 40%.
|
2026. Augusztus 27. Gáspár napja van
2026. Augusztus 27. Gáspár napja van
How Effective is the Flu Vaccine? Since health officials started tracking it in 2003, effectiveness of the flu shot has varied from year to year, averaging at 40%.
|
