A 1-Month-Old Boy Is Brought to the Emergency Department During

A 1-month-old boy is brought to the emergency department during winter with cough and difficulty breathing.  He has had rhinorrhea, cough, and congestion for the past 3 days.  Today, the patient began breathing harder and faster with increased cough.  Temperature is 37.8 C (100 F) and respirations are 68/min.  Oxygen saturation is 91%.  The patient is alert and awake and has subcostal and suprasternal retractions.  Mucous membranes are moist, and the anterior fontanelle is open and flat.  Physical examination reveals diffuse expiratory wheezes and scattered rales.  Which of the following pathogens is most likely causing this patient's condition?

A) Adenovirus
B) Bordetella pertussis
C) Mycoplasma pneumoniae
D) Parainfluenza virus
E) Respiratory syncytial virus
F) Streptococcus pneumoniae

Correct Answer:

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