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Flu Cases Arrive Earlier Than Usual This Season, Raising Concerns
The first cases of influenza for this season are appearing nearly three to four weeks earlier than in the past two years, according to the latest report from the European Centre for Disease Prevention and Control (ECDC). The report reflects the overall spread of the influenza virus across the European Union, Iceland, Liechtenstein, and Norway.
While it remains unclear whether this season will be more severe than previous years, a new strain of influenza A has been detected this autumn, also appearing in the United Kingdom. This new strain is raising concerns due to potentially low vaccination rates. Experts in virology also suggest this new strain may be significantly different from the influenza A strain included in this season’s flu vaccine.
Despite this potential mismatch, vaccination remains one of the most effective ways to prevent illness and the spread of the virus, particularly for vulnerable populations. This includes older adults, pregnant women, individuals with chronic health conditions and weakened immune systems, and others at increased risk of severe complications from the flu. Even a less effective vaccine offers better protection than no protection at all against serious illness.
The evolution of influenza viruses is constantly monitored, as they undergo continuous mutations. This is why flu vaccines are updated annually to keep pace with these rapid changes, a process that occurred this summer as well. Researchers have observed seven mutations in a seasonal flu strain known as H3N2, leading to a rapid increase in infections with the mutated virus, explained Professor Derek Smith, director of the Centre for the Evolution of Pathogens at the University of Cambridge.
Adding to the unusual pattern, infections have begun to appear in countries in the Northern Hemisphere as early as the summer months, with cases increasing in September as the weather cooled, and a rise in infections among children coinciding with the start of the school year.
The exact effects of these mutations on infection with the new strains are currently unknown. However, it is hypothesized that they could help the virus evade the human immune system, even in individuals who have some immunity from prior infections or vaccination. If the virus gains an increased ability to spread through these mutations, it could explain why the flu has appeared earlier this year than usual, and experts do not rule out the possibility of a more aggressive flu season than in recent years.
For comparison, in a typical flu season, 100 infected individuals might transmit the virus to 120 others. This year, experts estimate that 100 cases of the flu could lead to transmission to 140 people, potentially making this one of the most severe flu seasons in the last decade. (I.N.)
