Recently, the public has been concerned about the term "super flu," which is said to be more contagious and cause more severe symptoms than the common flu. Many are wondering whether this condition is truly dangerous and different from the influenza we are familiar with.
To address these concerns, it is important to understand what superflu is, how it relates to influenza A(H3N2) subclade K viruses, and how to recognize and respond appropriately.
What is Super Flu?
Recently, the term "super flu" has been widely discussed. Many people are concerned because it is said to be more contagious and more severe than the common flu.
It's important to clarify that superflu isn't an official medical term. It's used to describe the currently widespread seasonal flu, particularly that caused by the influenza A(H3N2) subclade K virus.
Getting to know Influenza A(H3N2) Subclade K
Influenza A(H3N2) is a long-standing flu virus that circulates annually. It can naturally change over time, and one of its newest forms is called subclade K.
According to the World Health Organization (WHO), there has been an increase in flu cases in various countries in recent months. This is related to the winter season, when flu is more easily spread. Subclade K was first discovered in August 2025 and has now been detected in many countries. However, the WHO stated that this is still a common seasonal flu pattern.
What is the Super Flu situation in Indonesia?
The Indonesian Ministry of Health stated that until the end of December 2025, the influenza A(H3N2) subclade K situation in Indonesia is still safe and under control.
There have been 62 recorded cases spread across several provinces, primarily East Java, South Kalimantan, and West Java. Most of the cases involved children and women.
The good news is that the number of flu cases in Indonesia has actually decreased in the last two months and no symptoms more severe than the common flu have been found.
Super Flu Symptoms to Watch Out For
Symptoms of Super Flu/influenza A(H3N2) subclade K are similar to the flu in general, such as:
- Fever
- Coughs and colds
- Sore throat
- Headache
- Muscle and joint pain
- Body feels weak
In most people, symptoms improve within about a week. However, in at-risk groups, influenza can develop into a more serious condition.
Who is at risk for complications?
Influenza can be more serious in some groups, such as:
- Children
- Elderly
- Pregnant mother
- People with chronic diseases (diabetes, heart, lung and kidney disease)
- Individuals with low immunity
In this group, influenza can cause pneumonia, hospitalization, and even death if not treated properly.
Is Influenza A(H3N2) Subclade K More Dangerous?
Based on WHO assessment and available epidemiological data, influenza A(H3N2) subclade K does not show increased severity compared to other influenza subclades.
To date, there is no evidence that subclade K can evade immunity from previous infection or influenza vaccines. Influenza viruses, including A(H3N2), do evolve over time and are closely monitored through global surveillance systems.
When to See a Doctor?
Consult a doctor immediately if you or a family member experiences:
- High fever that does not improve
- Shortness of breath or chest pain
- Flu symptoms last more than three days
- Flu in young children, the elderly, or pregnant women
- Rapid decline in general condition
Protect Your Health with EMC Cikarang Hospital
EMC Cikarang Hospital provides specialist doctor consultation services, influenza vaccinations, and Medical Check Ups (MCU) to help maintain the health of you and your family.
Don't ignore persistent flu symptoms. Early examination and treatment can prevent more serious complications.
Article written by Dr. Fenny Elvina Ridho, Sp.PD – FINASIM (Internal Medicine Specialist, EMC Cikarang Hospital).