title: Letter: Psittacosis.
mesh_terms: D000328:Adult; D000818:Animals; D003168:Complement Fixation Tests; D004199:Disease Vectors; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011563:Psittaciformes; D009956:Psittacosis / Q000175:diagnosis* / Q000453:epidemiology / Q000276:immunology / Q000517:prevention & control