title: Incidence of respiratory tract chlamydial infections and importation of psittacine birds.
mesh_terms: D000818:Animals; D006801:Humans; D011563:Psittaciformes; D009956:Psittacosis / Q000453:epidemiology* / Q000517:prevention & control; D012141:Respiratory Tract Infections / Q000453:epidemiology / Q000209:etiology*; D006113:United Kingdom; D014481:United States