title: Typing field isolates of infectious bronchitis by the plaque-reduction test.
abstract: A technique is described for typing field isolates of infectious bronchitis virus by plaque-reduction assay of the serum antibody response of chickens experimentally infected with such isolates. Also reported are use of the technique with field isolates and a comparison of results obtained in plaque-reduction assay and in tracheal-ring organ-culture assay.
mesh_terms: D002478:Cells, Cultured; D003332:Coronaviridae / Q000145:classification*; D001351:Infectious bronchitis virus / Q000145:classification*; D009500:Neutralization Tests; D009924:Organ Culture Techniques; D012703:Serotyping / Q000379:methods*; D010948:Viral Plaque Assay / Q000379:methods