New type of flu emerges: What to know about the new K variant of influenza A

A New Variant of Influenza A

As flu season progresses, scientists have identified a new strain of the influenza A virus known as the K variant. According to the Centers for Disease Control and Prevention (CDC), this form has genetic features that distinguish it from previous influenza A strains currently in circulation.

How the K Variant Differs

The CDC explains that the K variant shows slight mutations in the hemagglutinin (HA) and neuraminidase (NA) proteins—the two surface proteins responsible for virus attachment and release in host cells. These small genetic differences may impact how easily the virus spreads or how the immune system recognizes it.

“The influenza virus evolves continually, and new variants can sometimes appear unexpectedly,” the CDC stated in its recent update.

Symptoms and Spread

So far, the symptoms caused by the K variant appear similar to those of traditional influenza A infections: fever, cough, sore throat, body aches, and fatigue. Health experts say the transmission pattern also mirrors that of other seasonal flu viruses, through respiratory droplets and contact with contaminated surfaces.

Current Vaccines and Protection

Health officials emphasize that current flu vaccines are still expected to provide some protection, even if not a perfect match. The CDC encourages continued vaccination to reduce illness severity and lower hospitalization risks.

“Vaccination remains the best defense against influenza, even when new variants appear,” said Dr. Angela Rasmussen, a virologist at Georgetown University.

Ongoing Monitoring and Research

Researchers are actively studying the K variant to understand its spread, virulence, and potential for further mutation. So far, there is no evidence suggesting it causes more severe disease than other influenza A types, but global health agencies are maintaining close surveillance.

Public Guidance

Medical experts recommend standard precautions to protect against the flu: regular handwashing, covering sneezes and coughs, staying home when sick, and keeping vaccinations up to date.

“People should not panic, but they should remain cautious and follow regular preventive measures,” advised the World Health Organization (WHO).

Author’s Summary: A newly detected K variant of influenza A shows minor mutations but causes similar symptoms to other flu strains; experts urge vaccination and hygiene vigilance.

WHO13 on MSN — 2025-12-01