Haemophilus influenzae and chronic bronchitis.
D000937:Antigen-Antibody Reactions; D001315:Australia; D001991:Bronchitis / Q000209:etiology*; D005060:Europe; D006193:Haemophilus influenzae / Q000276:immunology / Q000472:pathogenicity*; D006801:Humans; D014481:United States