A 10-month-old child has been brought into the emergency room (ER)by her parents,who state that after few days with low-grade fever,malaise,and rhinorrhea,their child presented with a "barking" cough and increased work of breathing.What condition is this child likely exhibiting?

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The child with LTB presents with a gradual prodrome of low-grade fever,malaise,rhinorrhea,and hoarse voice.Over several days the illness progresses to inspiratory stridor and a "barky" cough,often described as sounding like the bark of a seal.Physical examination reveals nasal flaring,nasal congestion,use of accessory muscles,and suprasternal,subcostal,and intercostal retractions that,along with the stridor,become worse when the child is agitated.

A 10-Month-Old Child Has Been Brought into the Emergency Room