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Different genotypes of nephropathogenic infectious bronchitis viruses co-circulating in chicken popu
【机 构】
:
Laboratory of Infectious Disease,College of Veterinary Medicine,China Agricultural University,Beijin
【出 处】
:
15th World Veterinary Poultry Congress(第十五届禽病大会)
【发表日期】
:
2007年1期
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