For active immunisation of chickens (broiler and future layers/breeders) in order to reduce the detrimental effect resulting from the infection by avian infectious bronchitis virus, serotype Massachusetts on the ciliary activity, which may be manifested in respiratory clinical signs..
Onset of immunity: 3 weeks after vaccination
Duration of immunity: 5 weeks after vaccination
|Active(s):||Attenuated live virus of avian infectious bronchitis, Massachusetts serotype, strain H-120|
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