H3N2 Flu Cases on the Rise: Symptoms, Prevention, and When to See a Doctor

Flu cases linked to the H3N2 virus are being reported in increasing numbers across several regions, and doctors are advising people to stay alert — but not panic. H3N2 is a subtype of the influenza A virus that causes respiratory illness in humans. While it usually results in mild to moderate symptoms, the infection can become serious for vulnerable groups such as young children, the elderly, pregnant women, and those with weakened immune systems.

This virus spreads through respiratory droplets when an infected person coughs, sneezes, or talks. It can also linger on surfaces like doorknobs, handrails, or phones, making it easy to catch through indirect contact — a mode of transmission known as fomite spread.

Common Symptoms of H3N2 Flu

Symptoms typically appear within 1 to 4 days of exposure. In most cases, the illness starts with a sudden high fever and persistent cough, often followed by:

Sore throat

Runny or blocked nose

Body aches and muscle pain

Headaches and fatigue

Chills and nausea

Abdominal discomfort or mild diarrhoea

The fever may last for three to four days, while symptoms like cough and fatigue can linger for up to several weeks. In rare cases, complications like pneumonia may develop, especially in high-risk individuals.

Doctors suggest seeking medical advice if symptoms persist for more than five days, or if they worsen suddenly. Antiviral medications may be prescribed in such cases to reduce the severity and duration of the illness.

Precautionary Measures You Should Follow

Staying safe from H3N2 requires a mix of basic hygiene practices and mindful self-care. Here are a few doctor-recommended precautions to follow:

Wear a mask in crowded public spaces, especially if you’re feeling unwell

Wash your hands regularly with soap and water

Cover your nose and mouth when coughing or sneezing

Drink plenty of warm fluids, including water and milk

Eat balanced, nutritious meals to support your immune system

Avoid touching your face with unwashed hands

Disinfect commonly touched surfaces like phones and doorknobs regularly

While wearing masks and avoiding crowds isn’t mandatory at this stage, it’s still a smart preventive measure — especially during a surge in respiratory infections.

How is H3N2 Treated?

Treatment depends on the severity of symptoms. Most mild cases can be managed at home with rest, fluids, and over-the-counter medications to reduce fever and ease discomfort.

For more severe cases, doctors may prescribe antiviral drugs like Oseltamivir, which help in reducing the duration and severity of the illness. However, experts strongly advise against taking antibiotics unless a secondary bacterial infection is confirmed by a blood test.