Bronchiolitis is a clinical diagnosis preceding upper respiratory illness and/or rhinorrhea.
Signs of respiratory illness which may include wheezing, retractions, oxygen desaturation, color change, nasal flaring.
There is also presence of apnea especially in premature or low birthweight infants, signs of dehydration and exposure to persons with viral upper respiratory infections.
Symptoms are usually worst on the 3rd-5th day of illness and then improve gradually.
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