Influenza, commonly known as the flu, is a contagious respiratory illness caused by rapidly mutating influenza viruses. Its ability to change swiftly necessitates constant efforts for containment. This is where the influenza vaccine becomes crucial, offering a proactive approach to halt its spread. Flu shots, like Fluarix Tetra Injection, contain the Influenza vaccine, protecting individuals from flu viruses and acute infections affecting the lungs caused by Influenza A or Influenza B. Why influenza vaccine is important?