[On the prophylactic vaccination against infectious bronchitis with live vaccine. 1. Virulence tests of the virus].
D000818:Animals; D001991:Bronchitis / Q000517:prevention & control / Q000662:veterinary*; D002645:Chickens; D011201:Poultry Diseases / Q000517:prevention & control*; D012328:RNA Viruses / Q000472:pathogenicity*; D014611:Vaccination
Zur Frage der Impfprophylaxe gegen infektiöse Bronchitis mit Lebendvaccine. 1. Teil: Virulenzprüfungen des Impfvirus.