Seasonal influenza is an acute respiratory infection caused by influenza viruses, which occurs annually during the autumn and winter seasons.

The infection spreads through airborne droplets and is characterized by a sudden onset, high fever, fatigue, muscle pain, headache, and cough.

Influenza poses a particular risk to the elderly, children, pregnant women, and individuals with chronic illnesses, as they are more prone to developing complications.

Vaccination is the most effective way to prevent seasonal influenza, providing protection against the virus strains most prevalent during a given season.

The composition of the vaccine is updated annually to match circulating viral strains and to ensure an optimal immune response.