title: Incidence of chlamydial antibodies in commercial duck flocks.
mesh_terms: D000367:Age Factors; D000818:Animals; D000907:Antibodies, Bacterial / Q000032:analysis*; D002691:Chlamydophila psittaci / Q000276:immunology*; D004372:Ducks / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay
chemical_list: D000907:Antibodies, Bacterial