Pneumonia in older patients with cystic fibrosis is usually caused by

Pneumonia in older patients with cystic fibrosis is usually caused by

Hypercarbic respiratory failure can occur in

The sweat chloride test, which is still the standard diagnostic test for cystic fibrosis (CF), is positive if sweat chloride more than

Factors predisposing to secondary pneumothorax (underlying cause identified) include all the following EXCEPT

A l-year-old presents with an acute onset of cough, choking, and respiratory distress. Physical evaluation reveals a respiratory rate of 45 and wheezing. There is no family history of asthma, and no one at home is ill. The older sister states that they were both playing house and that they both had eaten sunflower seeds. The most likely diagnosis is