What is the current flu activity level in the U.S. according to the CDC?

As of last week, flu activity was high in four states (Colorado, Louisiana, New Jersey, New York) and minimal or low in most others.

Are there new RSV vaccines available for infants and older adults?

Yes, new RSV vaccines were licensed in 2023 for pregnant women and older people, and injections of laboratory-made antibodies are available for infants.

How effective are COVID-19 vaccines for children?

Recent CDC research shows COVID-19 vaccines are 76% effective against severe illness in children aged nine months to 4 years, and 56% effective in older children.

Home / Health / Flu Season Low, But New Virus Strain Emerges

Flu Season Low, But New Virus Strain Emerges

13 Dec, 2025

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Summary

Flu activity is low nationwide, but high in four states.
A new variant of H3N2 flu strain differs from current shots.
RSV infections are increasing, but new vaccines offer protection.

Flu Season Low, But New Virus Strain Emerges

Flu season activity is currently low nationwide, with only Colorado, Louisiana, New Jersey, and New York reporting high levels. Severity indicators are within mild season boundaries, though a concerning new variant of the H3N2 flu strain has been identified, which differs from the current year's vaccine.

Respiratory Syncytial Virus (RSV) cases are trending upward, with infections increasing in the South and mid-Atlantic states. However, new vaccines for pregnant women and older adults, along with antibody injections for infants, are expected to provide protection.

COVID-19 activity is at a low point. Recent research shows that COVID-19 vaccines remain effective in preventing severe illness in children, although uptake for this season's vaccine remains low among both children and adults.

Disclaimer: This story has been auto-aggregated and auto-summarised by a computer program. This story has not been edited or created by the Feedzop team.