title: Small infective material coexistent with, but distinct from, avian infectious bronchitis virus.
mesh_terms: D000818:Animals; D002499:Centrifugation, Density Gradient; D002642:Chick Embryo; D002850:Chromatography, Gel; D003332:Coronaviridae / Q000302:isolation & purification*; D001351:Infectious bronchitis virus / Q000254:growth & development / Q000302:isolation & purification* / Q000648:ultrastructure; D008970:Molecular Weight; D014462:Ultrafiltration; D014771:Virion