Influenza

Influenza, commonly known as the flu, is a contagious viral infection that primarily affects the respiratory system, including the nose, throat, and lungs. It is caused by influenza viruses, which are classified into several types, with the most common being influenza A and B. The flu is characterized by sudden onset of symptoms such as fever, chills, cough, sore throat, body aches, headache, and fatigue. In some cases, it can lead to severe complications, especially in vulnerable populations such as the elderly, young children, and individuals with weakened immune systems. Influenza spreads mainly through respiratory droplets when an infected person coughs or sneezes, as well as by touching surfaces contaminated with the virus. Annual vaccination is recommended to reduce the risk of infection and its complications, as the virus can mutate and lead to different strains of influenza each year.