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USMLE · Question #495
USMLE Question #495: Real Exam Question with Answer & Explanation
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Question
A 10-month-old boy is brought to the physician because of a 4-day history of fever and cough. His illness began with low-grade fever and copious, clear nasal discharge. Two days ago he developed a moist, nonproductive cough and rapid breathing. He has received all scheduled childhood immunizations. He attends a large day-care center and has three school-aged siblings. His temperature is 38°C (100.4°F), pulse is 101/min, respirations are 38/min, and blood pressure is 85/60 mmHg. Physical examination shows nasal flaring and rhinorrhea. Chest examination shows intercostal retractions along with bilateral, diffuse wheezes and expiratory rhonchi. The infectious agent of this patient's condition most likely has which of the following properties?
Options
- ADNA genome
- BDouble-stranded nucleic acid genome
- CMature virion lacking viral polymerase
- DMediation of cell entry via a fusion protein
- EViability on surfaces for several weeks
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