A common respiratory virus that is especially serious for premature and other small infants because it causes extremely thick secretions is

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Respiratory syncytial virus (RSV) is a common respiratory virus that can cause serious illness, especially in premature and other small infants. RSV infects the lungs and causes extremely thick secretions, making it difficult for the baby to breathe. Croup, asthma, and epiglottitis are all respiratory illnesses, but they do not specifically cause thick secretions in infants.

A Common Respiratory Virus That Is Especially Serious for Premature