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Flu on the Rise: What You Need to Know About the New Variant

USASunday, January 4, 2026
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The U.S. is experiencing a significant rise in flu cases, attributed to a new variant known as subclade K. This variant was first identified in regions like the U.K., Japan, and Canada. According to the CDC, over half of the states are now reporting high or very high levels of flu activity.

Current Statistics

  • 7.5 million illnesses
  • 81,000 hospitalizations
  • 3,100 deaths

These figures, up to December 20, do not include the impact of the holiday season. Notably, at least eight children have been affected.

State-Specific Data

Some states are experiencing more severe outbreaks. For instance, New York recently had its worst week for flu cases since 2004, with 71,000 cases reported in a single week.

Vaccination Recommendations

Experts emphasize that it is not too late to get a flu shot. While the current vaccine may not be a perfect match for the new variant, a study in the U.K. suggests that it can reduce the risk of hospitalization.

About Subclade K

The flu virus is constantly evolving, and subclade K is a mutated version of the H3N2 strain. Known for its severity, particularly among older adults, the mutations in subclade K make the current vaccine less effective, though not entirely ineffective.

Treatment Options

The CDC recommends antiviral medications for high-risk individuals, which should be started within 48 hours of symptom onset.

Vaccination Guidelines

The CDC and major medical groups advise that everyone aged 6 months and older should receive a flu vaccine. The vaccine is particularly crucial for:

  • Older adults
  • Pregnant women
  • Young children
  • Individuals with chronic health conditions

Types of Vaccines Available

  • Flu shots for all ages
  • FluMist nasal spray for ages 2 to 49

Some individuals may now be able to use FluMist at home.

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