A male infant was admitted at 27 days of age with respiratory distress. The infant was born by normal vaginal delivery to parents of nonconsanguineous marriage. The antenatal period was uncomplicated. He had moderate fever (101°F–102°F) on and off from 10 days of age. After age 20 days, the infant had a cough that was not exaggerated either with feeding or with crying. At 24 days, the infant had developed fast and increased work of breathing and hence was referred. The newborn received oral antibiotics from 10 to 15 days of age and intravenous antibiotics with steam inhalation from day 17 to day 23 of age. At admission, the infant weighed 3.5 kg, had a temperature of 37.5oC, heart rate of 168 beats per minute, respiratory rate of 74 per minute, mild to moderate subcostal and intercostal retractions, pulse oxygen saturation of 87% on room air, liver 3...

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