We report the development of HSV-1 laryngotracheitis during the resolution phase of typical viral laryngotracheobronchitis (LTB) in an infant. This case represents an uncommon complication of viral LTB which has previously been described only at autopsy and suggests that prolonged use of systemic corticosteroids may lead to secondary infections, such as HSV-1. Therefore, we recommend that corticosteroid therapy for LTB be limited to 48 degrees in duration. This case also demonstrates that when an atypical clinical course is being followed by a patient who has LTB, then early diagnostic intervention is indicated. If HSV-1 is identified, anti-viral chemotherapy should be initiated and artificial airway management may be necessary. Tracheal intubation may be used, but, if extensive subglottic ulceration occurs, the subglottis should be bypassed in order that the chance of subglottic stenosis be minimized. In this case, early identification by bronchoscopy and viral cultures resulted in a successful combined medical-surgical management and total resolution with no sequelae.