<unk>  is one of the most common acute respiratory diseases that affects infants and children. The annual incidence of<unk>  is 3,000 per 100,000 children in the United States. It occurs mostly during fall, winter, and early spring.<unk>  may affect any age group, but mostly affects infants, especially those under 2 years of age.<unk>  occurs more often in males than females and is more common among Native Americans, Alaskans, and Hispanics.<unk>  has a low mortality rate despite the high number of hospitalizations associated with the illness.
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