Flu vaccine effectiveness in South America was 35% against hospitalization. ... A CDC spokesperson said that the effectiveness of the vaccine for H1N1 was "within the range" of previous seasons.

Why the CDC is warning that this flu season is on track to be one of the worst in a decade 03:26. This season's influenza vaccine may have been a poor match to a strain of the flu virus that ...

The CDC explained that while this year’s VE is lower than it was in 2023, it’s still in historical range to effectively protect against influenza A; past data has shown that the flu shot ...

Two types of influenza viruses are responsible for seasonal flu outbreaks: Influenza A and B. Influenza A accounts for around 75 percent of all cases and tends to cause more severe illness in adults.

The flu vaccine, for everyone ages 6 months and older, is crucial, Dr. Eduardo Azziz-Baumgartner, a medical epidemiologist in CDC’s Influenza Division, previously told USA TODAY.