Influenza is an infection of the lungs as a result of infection with a virus, and it is an infectious disease, as it is transmitted through droplets from coughing and sneezing, or as a result of using the tools of an infected person, and it results from infection with the causative virus, such as A, B, and C viruses, which leads the body to The formation of antibodies, and thus providing the patient with partial protection, and in this article we will introduce you to the flu and its symptoms.