An 18-Month-Old Boy Is Brought to the Physician by His

An 18-month-old boy is brought to the physician by his parents for fever, runny nose, and sore throat.  The physician reassures the parents and recommends supportive care with plenty of fluids.  He sends them home with instructions to follow up if the boy's symptoms worsen.  Two days later, the infant is brought to the emergency department with persistent fever, brassy cough, and difficulty breathing.  Physical examination reveals stridor.  Which of the following pathogens is most likely responsible for this patient's condition?

A) Rhinovirus
B) Paramyxovirus
C) Togavirus
D) Parvovirus
E) Calicivirus

Correct Answer:

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