Bacterial<unk>  is most often caused by the bacteria Staphylococcus aureus. It frequently follows a recent viral upper respiratory infection. Common causes include Streptococcus Pyogenes, Haemophilus Influenza, Moraxella Catarrhalis, Mycoplasma Pneumonia, Echoviruses,  Klebsiella Pneumonia, Adenovirus, Rhinovirus, Coxsakievirus and Influenza virus.
Tracheitis causes
Bronchitis causes
Bronchiectasis causes
Air embolism causes
Tracheitis risk factors
Bronchiolitis causes
Airway obstruction causes
Croup causes