At a Glance
- A new subclade K flu variant is driving a rapid rise in U.S. cases.
- CDC reports 7.5 million illnesses, 81,000 hospitalizations, and 3,100 deaths so far.
- Only 42% of adults and children have received a flu shot this season.
- Why it matters: The surge threatens hospitals and highlights the need for vaccination.
The U.S. flu season is accelerating as a new subclade K variant spreads across the country. CDC data shows record illness and death numbers, yet vaccination coverage remains below half. Public health officials urge people to get vaccinated before the holiday travel boom.
What Is Subclade K?
Subclade K is a mutated version of the H3N2 strain, which is already known for causing severe illness in older adults. The mutations are enough to reduce the effectiveness of this year’s vaccine but do not create a completely new flu type. Early reports suggest the variant spreads more easily than previous strains.
- Mutated H3N2 strain
- Harsh for older adults
- Partially evades current vaccine
Current Impact and Statistics
CDC estimates at least 7.5 million illnesses, 81,000 hospitalizations, and 3,100 deaths as of Dec. 20, before major holiday gatherings. New York recorded 71,000 cases in the week ending Dec. 20, the most in a single week since 2004.
| Metric | Count |
|---|---|
| Illnesses | 7.5 million |
| Hospitalizations | 81,000 |
| Deaths | 3,100 |
| Vaccinated | 42% |
These figures illustrate a severe season, though it is too early to determine the exact level of danger.
Vaccination and Prevention
Only about 42% of the population has been vaccinated this year, leaving a large portion susceptible. The current vaccine, while not a perfect match, offers partial protection and lowers hospitalization risk. Flu shots are recommended for everyone aged six months and older, including a nasal spray FluMist for ages 2-49, which some people may now administer at home.
Key Takeaways
- Subclade K is a mutated H3N2 strain driving a rapid flu surge.
- CDC reports 7.5 million illnesses, 81,000 hospitalizations, 3,100 deaths, and 42% vaccination coverage.
- Vaccination remains the best defense; flu shots are advised for all ages 6 months+.
The growing flu threat underscores the urgency of getting vaccinated before the holiday travel season.
