Human respiratory syncytial virus(RSV) is a syncytial virus that cause respiratory tract infections. It is a major cause of lower respiratory tract infections and hospital visits during infancy and childhood.
Adenovirus infections most commonly cause illness of the respiratory system; however, depending on the infecting serotype, they may also cause various other illnesses and presentations. It is a major agent of pneumonia and acute respiratory disease, mainly caused by serotypes 1, 2, 3, 5, 7 and 14.
Flu is potentially serious viral respiratory disease caused by influenza virus that circles the glover every year. As it spreads, the virus slowly changes its genetic materials that make it very difficult for our immune systems to recognize the infection.