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Global Adenovirus Outbreak Raises Concerns Amid Flu Surge

12/22/2025

Center

Adenovirus Outbreak Spreads

A new adenovirus outbreak is described as untreatable and spreading globally, with flu-like symptoms.
Eric Sachinwalla, medical director, notes adenovirus is more resilient than flu or COVID-19, hindering elimination.
Although most cases are mild, immunocompromised individuals may suffer severe effects.
In the U.S., flu cases rise, especially the H3N2 variant, with hospitalizations up 14.3%.
Experts advise vaccination and caution as flu season progresses, urging monitoring of symptoms.

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A/H3N2 Dominates Flu

The A/H3N2 subclade K has become predominant in the United Kingdom and Japan.
This subclade accounts for nearly 90% of flu samples in these regions.
The subclade has been detected globally.
The flu season started earlier than usual, with vaccination remaining the best defense against severe illness.
Public health measures, including hand washing and masking, are recommended.

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Adenovirus Outbreak Spreads

A new adenovirus outbreak is described as untreatable and spreading globally, with flu-like symptoms.
Eric Sachinwalla, medical director, notes adenovirus is more resilient than flu or COVID-19, hindering elimination.
Although most cases are mild, immunocompromised individuals may suffer severe effects.
In the U.S., flu cases rise, especially the H3N2 variant, with hospitalizations up 14.3%.
Experts advise vaccination and caution as flu season progresses, urging monitoring of symptoms.

1 / 2