• Increased morbidity is seen in infants with incomplete development of the airway, damage to the airway, or airway hyper-reactivity.
• Although premature birth and underlying medical conditions are associated with a higher risk of hospitalization and severe RSV manifestations, most hospitalizations for RSV disease occur in otherwise healthy infants.
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Please see the table “Risk Factors.”
• Factors such as family history of asthma and genetic history are also associated with severe RSV, but our understanding of the exact mechanism is