Flu season in Finland has arrived weeks earlier than expected, and health authorities say the situation is serious enough that people should not delay vaccination. Confirmed influenza cases are already rising across the country, and a new subtype of the virus is spreading among the population.
The Finnish Institute for Health and Welfare (THL) confirmed this week that influenza activity in Finland began earlier than normal. The European Centre for Disease Prevention and Control (ECDC) has also reacted by calling for immediate vaccination across Europe, especially for people who are at higher risk of severe illness.
“Protection from the vaccine takes about two weeks to develop. Risk groups should not wait,” said Hanna Nohynek, Chief Physician at THL.
Why the flu season arrived early this year
The early surge in flu infections is not limited to Finland. Several European countries are reporting similar patterns, suggesting that influenza activity is accelerating across the continent.
In Finland, laboratory data shows a steady rise in cases throughout November. THL has confirmed that influenza A viruses changed genetically over the summer, and a mutated form of the H3N2 subtype is now the dominant strain in circulation.
This matters because the new virus structure is slightly different from the strain used in this season’s flu vaccine.
“If the circulating virus differs from the vaccine strain, the vaccine may not be as effective as expected,” Nohynek explained. “Even so, vaccination is still the best protection we have.”
How effective is the current flu vaccine?
No flu vaccine is ever a perfect match. Influenza viruses evolve quickly, and each season typically includes multiple strains.
In addition to virus mutations, vaccine effectiveness also depends on factors such as:
- Age
- Existing medical conditions
- Medications that weaken the immune system
- How long ago the vaccine was taken
While protection may vary, vaccination still reduces the risk of severe illness, hospitalization, and complications.
Who should get vaccinated first
THL strongly recommends flu vaccination for high-risk groups and those who work with vulnerable populations. These include:
- Children under seven years old
- Adults aged 65 and above
- Pregnant women
- People with chronic illnesses
- Conscripts starting military service
- Healthcare and pharmaceutical workers
- People in institutional care
- Close contacts of high-risk individuals
Vaccination is not only about personal protection. It also slows down transmission within homes, workplaces, and communities.
How to prevent infection beyond vaccination
THL also reminded the public to return to basic hygiene habits that limit the spread of respiratory viruses:
- Stay home if you feel sick
- Wash hands regularly
- Cough or sneeze into your sleeve
- Use a mask in crowded places when necessary
- Improve indoor ventilation
- Avoid close contact when symptoms appear
Several respiratory viruses are circulating simultaneously this season, including strains that cause the common cold and flu-like infections.
What to do if you catch the flu
Most flu cases can be treated at home with proper rest, hydration, and fever management. Antiviral medication may be prescribed when needed, but these drugs work best when started early.
Anyone experiencing severe symptoms, breathing difficulty, or worsening health should seek medical advice promptly.
