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Viral bronchiolitis is the most common cause of hospitalization among infants. Despite its prevalence, no consistently effective therapy has been found to date, providing the driving force behind much of the ongoing research into this illness. In this review, we present a summary of the most recent published trials of interventions for bronchiolitis. Included are studies evaluating bronchodilators, corticosteroids, positive pressure ventilation, as well as 3 newer therapies for bronchiolitis: heliox, mucolytics, and leukotriene receptor antagonists.