Influenza flu &pneumonia
farhat, Lotfia (2022-05-18)
Presentation
Influenza (flu) is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and sometimes the lungs. It is one of the most severe illnesses of the winter season. Influenza is spread easily from person to person. There are four types of influenza viruses: A, B, C and D.