The number of H3N2 cases is rising worldwide: what is the "superflu" and how to recognize it

During the winter season, various countries are recording an increase in cases of Influenza A (H3N2). This flu subtype can spread rapidly and, in some people, cause more severe illness than a common cold — especially in those at risk.

What H3N2 is and why it is called the "superflu"

H3N2 is one of the subtypes of the influenza A virus. Media sometimes call it the "superflu" due to more pronounced symptoms and high contagiousness during seasonal waves, but essentially it is influenza, not a "new disease".

Symptoms

Manifestations are usually typical of flu and can begin suddenly:

• high fever, chills
• sore throat, runny nose
• cough
• headache
• muscle aches, pronounced weakness/fatigue

Who should be especially careful:
Flu is usually more severe in: elderly, young children, pregnant women, people with chronic conditions (heart, lungs, diabetes, etc.) and those with weakened immune systems.

Prevention and what to do if symptoms appear:

General measures: hand hygiene, ventilation, less contact when sick, mask in confined spaces if symptomatic. Seasonal flu vaccination usually includes current strains (including H3N2) and reduces the risk of severe illness.

If the condition is severe or you are in a risk group — it is better to see a doctor: antiviral medications are most effective within the first 48 hours of symptom onset (as prescribed by a specialist).