Newcastle Disease(ND) and chicken Infectious Bronchitis(IB) are both serious infectious diseases.

 
  • 鸡新城疫(Newcasttle Disease,ND)和鸡传染性支气管炎(Infectious Bronchitis,IB)是鸡的主要呼吸道传染病,严重危害养鸡业的发展。
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