Ten strains of adult specific pathogen free chickens are inoculated with Laryngotracheitis(ILT) virulent virus,to in vestigate the clinical signs and the pathological changes by autopsy.

 
  • 用传染性喉气管炎(ILT)强毒株感染10个家系150日龄BWEL?SPF鸡,观察比较临床症状和剖检所见病变;
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