BACKGROUND: In Morocco, pediatric pneumonia remains a serious public health problem, as it constitutes the first cause of mortality due to infectious diseases. ...The majority of acute respiratory tract infections had a viral origin 95 : respiratory syncytial viruses A and B 49 , rhinovirus 21 , coronaviruses 229E 11 , humain metapneumovirus 5 , influenza A 3 , influenza H1N1 1 , adenovirus 2 , and parainfluenza virus type 4 2 . ...