H3N2 Flu: Symptoms, Diagnosis and Treatment

H3N2 is a subtype of influenza virus.  It is also known As “Hong-Kong flu” because of its origin in Asia. 

Also searches for- H3N2 Virus, Influenza A virus, Hong-Kong Flu

H3N2 is a subtype of influenza virus. It is also known As “Hong-Kong flu” because of its origin in Asia.

As the H3N2 cases are rising in India, this outbreak is a significant concern that requires attention and action. H3N2 spreads easily from one person to another and patient’s report flu-like symptoms. One of the main reasons for H3N2 spread is sudden changes in weather or from extreme cold to hot.

This is a lethal disease and the H3N2 virus evolved very rapidly that creating difficulties in predicting and treating.

What are the Symptoms of H3N2?

Symptoms of H3N2

The symptoms of H3N2 are similar to flu or influenza. Its symptoms range from mild to severe and primarily affect the respiratory tract. The symptoms may occur suddenly, which include:


A complication of H3N2 mostly occurs in older people, patients with heart disease, immune compromises and in women with pregnancy, especially in the 2nd-3rd trimester.

In severe cases, H3N2 causes complications like: - pneumonia and bronchitis.

How is H3N2 Flu Diagnosed?

If you or your healthcare provider suspects H3N2, several diagnostic tests are available at Ganesh Diagnostic and Imaging Centre. To confirm the presence of the virus:

What is the Treatment of H3N2?

Simple seasonal flu-like symptoms can be treated by controlling symptoms.

Medications for fever, headaches, body pains and aches are prescribed by the doctor.

Antiviral drugs are prescribed that help in reducing the length of illness. It’s important to start with anti-viral drugs within 48 hours as the symptoms develop.

In addition to antiviral and analgesic medications, patients need to take the following measures to heal early:

  • Drink plenty of fluids and stay hydrated
  • Rest well

Ganesh Diagnostic Centre and Imaging Centre also suggest seeking immediate medical care if you fall under the following high-risk categories:

  • Age more than 60 years of age
  • Children below 5 years of age

Pregnant women

Patients with chronic disease and systemic disorders like: - diabetes, pneumonia, asthma, heart disease or immuno-compromised peoples.

How to prevent H3N2?

How to Prevent H3N2

H3N2 is contagious as Covid-19 and communicable disease which spreads through infected droplets.

Prevention strategies for seasonal and influenza A (H3N2flu) are:

  • Maintain hand hygiene- wash your hands with soap and water or sanitizer
  • Wear mask in public places
  • Cover your mouth while sneezing and coughing
  • Drink plenty of water
  • Do not spit in public
  • Avoid close contact with infected person
  • Get vaccinated against the flu annually
  • Stay isolated for about 24 hours after your fever has subsided to avoid spreading the flu to others if you are sick.


In conclusion, understanding the clinical symptoms and available diagnostic tests for H3N2 flu is crucial for early detection and appropriate management. By staying informed and taking preventive measures, we can collectively work towards a healthy future.

Keep track of your health. You can test yourself to see if you are infected with the H3N2 virus. Ganesh Diagnostic and Imaging Centre offer PCR test and other tests to confirm the diagnosis. We offer free home sample collection service and the results will be available within 24 hours. Schedule your test now!

We offer seamless and secure consultations with highly qualified doctors online.

For free consultation, Talk to doctor