<unk>  can be caused by contagious pathogens, most commonly viruses. Typical viruses include respiratory syncytial virus, rhinovirus, influenza, and others. Bacteria are uncommon pathogens but may include Mycoplasma pneumoniae, Chlamydophila pneumoniae, Bordetella pertussis, Streptococcus pneumoniae, and Haemophilus influenzae. * Damage caused by irritation of the airways leads to inflammation and leads to neutrophils infiltrating the lung tissue. * Mucosal hypersecretion is promoted by a substance released by neutrophils. * Further obstruction to the airways is caused by more goblet cells in the small airways. This is typical of chronic<unk> . * Although infection is not the reason or cause of chronic<unk> , it is seen to aid in sustaining the<unk> .
Acute bronchitis
Chronic obstructive pulmonary disease
Bronchitis kettle
Bronchiectasis
Dust pneumonia
Bronchiolitis
Atypical pneumonia
Asthma