Viral respiratory infections are the most common diseases seen in humankind and affect mostly children. Viruses have been shown to cause up to 90% of pneumonias during the first year of life,1−3 and this percentage decreases to approximately 50% by school age.1,5 Respiratory syncytial virus (RSV) is the major viral respiratory pathogen that causes lower respiratory tract infection (LRI) (bronchiolitis and pneumonia) in infants and young children worldwide and presents a large burden on healthcare resources.4 Parainfluenza, and influenza viruses, many types of adenovirus, rhinovirus, enterovirus, and also coronavirus, herpes simplex type I, and other viruses have also been detected in children suffering from respiratory infections (RI).1,5−9 High-risk groups for severe disease, especially from RSV, include age less than 3 months, preterm infants, and infants with underlying cardiopulmonary disease and/or immunodeficiencies.10