What respiratory illness can be caused by bacteria?

Lower Respiratory Infections: Bronchitis, Bronchiolitis and Pneumonia. Etiology: Causative agents of lower respiratory infections are viral or bacterial. Viruses cause most cases of bronchitis and bronchiolitis. In community-acquired pneumonias, the most common bacterial agent is Streptococcus pneumoniae.

Pneumonia is caused by bacteria in the lungs

Yes he thought they should be left to chance why, because he thought that was the best thing to do