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Symptoms include those of laryngitis: loss of voice; noisy, difficult, and stridulous breathing; weak, rapid pulse; livid skin; and moderate fever.
Several viruses may cause this disease. These include parainfluenza, respiratory syncytial virus, and various influenza viruses.
Antibiotics are indicated only if there is secondary bacterial infection; corticosteroids are of no benefit. If hypoxia is present, inhalation of a 40% concentration of well-humidified oxygen is indicated. This is best accomplished by a face mask.