Summary
Flu season in the United States has started, and a new variant called "subclade K" is responsible for many of the cases. The Centers for Disease Control and Prevention (CDC) says this variant could affect how well flu vaccines work this year. Health experts are watching closely as the season progresses.
Key Facts
- Subclade K is a new variant of the influenza virus causing flu cases in the U.S.
- In the week ending December 6, confirmed flu cases increased from 348 to 547.
- Subclade K made up 89% of the 163 flu samples studied since September 28.
- The CDC says the flu season is just starting and not above expected levels.
- Experts say that subclade K is potentially resistant to current flu vaccines.
- The CDC advises continued vaccination for protection against severe symptoms.
- Flu activity levels are high in at least five public health regions in the U.S.
- Scientists will keep monitoring the flu season and vaccine effectiveness.
