A 9 month old boy is brought to GP due to fever, rhinorrea, coughing, irritability and poor eating. Temp is 101 pulse is 188, resp is 71 and O2 is 88 percent. Physial exam shows dry mucuous membranes, retractions and nasal flaring. Auscultaiton shows wheezings and crackles. No FHX of allergies or asthma and he attends daycare 3 days a week at same location of his 4 year old brother. Parents mention that patients brother recovered from a cough and runny nose a few days ago. 1. What pathology do you suspect? 2. What immunological interaction is necessary to produce protective antibodies against the causative pathogen in this case?

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).