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As autumn settles in and temperatures drop, flu season, also known as influenza season, has officially begun in many parts of the world. Health experts warn that influenza continues to pose a serious global health threat, particularly for vulnerable populations. Public health authorities and infectious disease experts are warning of a potential surge in seasonal influenza cases and urging citizens, particularly those in high-risk groups, to get vaccinated without delay.
Influenza remains one of the most significant vaccine-preventable respiratory illnesses worldwide. According to the World Health Organization (WHO), seasonal influenza affects 3 million–5 million people each year globally, causing between 250,000 and 500,000 deaths. Türkiye’s Ministry of Health reports that seasonal flu activity typically begins in October and November, peaks between January and March, and can continue into May.
In Türkiye, early surveillance data from the National Sentinel Influenza Network indicate a steady increase in influenza-like illness (ILI) consultations compared to the same period last year. Hospitals and primary care centers have reported a notable rise in respiratory infections, including influenza A (H1N1 and H3N2) and influenza B strains, as well as other seasonal viruses such as RSV and rhinovirus.
The Ministry of Health and WHO highlight several populations at increased risk of severe influenza complications. These include:
Vaccination for these groups is provided free of charge under Türkiye’s national immunization program.
Seasonal influenza typically presents abruptly and is more severe than the common cold. Key symptoms include:
The best time to get vaccinated is during October and November, before flu activity reaches its peak. Each year, the composition of the vaccine is updated to target the strains most likely to spread during the upcoming season. The 2025 formulation, for example, protects against three to four major influenza viruses expected to circulate.
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