Viruses (boldis most common respiratory clinical presentation)
Rhinovirus (1–100+ serotypes; causes “common cold,” bronchitis and bronchiolitis)
Coronavirus (2299E and OC43 serotypes; causes “common cold”)
Influenza (A, B, and C serotypes; causes “common cold,” pneumonia and bronchitis)
Parainfluenza (1, 2, 3, and 4 serotypes; causes “common cold,” laryngotracheobronchitis, and bronchiolitis)
Respiratory syncytial virus (A and B serotypes; causes “common cold,” pneumonia, bronchitis, and bronchiolitis)
Adenovirus (1–4 serotypes; causes “common cold,” pneumonia, bronchitis and bronchiolitis)
Metapneumovirus (bronchiolitis)
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