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A wide variety of viruses are responsible for acute respiratory disease. The common cold—frequently of viral origin—can cause inflammation of the trachea and laryngitis, and such inflammation may extend to involve the lower bronchial tree. After such episodes the ciliary lining of the bronchial tree may be damaged, but the repair process is usually rapid. Infections with rhinoviruses and adenoviruses are especially important in children, in whom they cause a febrile (fever-associated) illness, occasionally with severe bronchiolar involvement. Although recovery is usually rapid, in some infections with respiratory syncytial virus an extensive bronchiolitis develops that may be severe enough to ...(100 of 14530 words)