Causative agents ->

Viral - rhinovirus, influenza, parainfluenza, RSV, human metapneumovirus, enterovirus, adenovirus, Ebstein Barr virus and herpes simplex virus

Non-viral - Streptococcus pyogenes, Pneumococcus, Moraxella, H. influenzae, S. aureus, B. pertussis, Mycoplasma, gonorrhea and C. diphtheriae