title: A comparative study of single and multiple respiratory infections in the chicken: multiple infections (with Mycoplasma gallisepticum, Newcastle disease virus, and infectious bronchitis virus).
mesh_terms: D000818:Animals; D006385:Hemagglutination Inhibition Tests; D009174:Mycoplasma; D009521:Newcastle Disease / Q000209:etiology*; D011201:Poultry Diseases / Q000209:etiology*; D012141:Respiratory Tract Infections / Q000209:etiology / Q000662:veterinary*; D014132:Trachea; D014777:Virus Diseases / Q000662:veterinary*; D014713:Viruses, Unclassified