A 2 week old boy is brought to doctor by mother because of a one day history of labored breathing. His home birth was uneventful and his immunizations are up to date but his mother reports that he developed pink eye after his first week of life. He is afebrile and has respiratory rate of 40/minute. Bilateral inspiratory crackles and a slight wheeze are heard on auscultation of the chest. A chest x ray is consistent with bilateral pneumonia. Laboratory studies show a leukocyte count of 15,000 with 10 % eosinophils. 1. What is your diagnosis? 2. What is likely causal agent? Why do you think this?

The main function of the respiratory system is gas exchange (O2 and CO2). Ventilation is the movement of air through the respiratory tract into (inspiration) and out of (expiration) the respiratory zone (lungs).