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Mid Influenza 1 Vaccine 2022 . What to know about the flu shot:common flu vaccine myths debunked. Quadrivalent flu vaccines protect against four different flu viruses. To ward off flu Shot or nasal spray? Depends on age from www.usatoday.com Influenza, also known as the flu, is a contagious disease that is caused by influenza viruses. Influenza viruses infect the respiratory tract (nose, throat, and lungs) in humans. Quadrivalent flu vaccines protect against four different flu viruses.