The 2025 flu season is proving to be particularly challenging, with a mutated strain of influenza A, known as H3N2 subclade K, spreading rapidly across the globe. As flu activity surges, it is crucial to understand the symptoms, how the virus spreads, and when to seek medical attention.
The signs of the flu can vary, but typically include a sudden onset of fever or feeling feverish, chills, cough, sore throat, runny or stuffy nose, muscle or body aches, and headaches. Some individuals may also experience fatigue, vomiting, and diarrhea, although these symptoms are more common in children. This year, the symptoms are reported to be more intense and last longer, posing a greater challenge to those affected.
In 2025, the flu season is marked by a new influenza A(H3N2) variant, subclade K, which is fueling a surge in cases, especially in the Northeast United States. This variant is contributing to a significant increase in doctor visits for symptoms such as fever with cough or sore throat, which have surpassed the epidemic threshold, confirming that flu season has started.
Children, in particular, are more vulnerable this year, with the CDC reporting record-high infections and hospitalizations. This heightened vulnerability underscores the importance of vaccination, maintaining good hygiene, and seeking timely medical care. The severity of the symptoms and the longer duration of illness highlight the need for extra precautions.
The distinction between influenza A and influenza B is also important. Influenza A is generally considered more severe and is the most common strain. This year, the H3N2 subclade K variant is causing particular concern due to its rapid spread and the intensity of symptoms it causes.
As the flu season progresses, it is essential to stay informed about the latest developments and to take proactive measures to protect yourself and others. Understanding the symptoms, seeking medical attention when necessary, and following public health guidelines can help mitigate the impact of the flu.
