Article
Attenuation mechanism of virulent infectious bronchitis virus strain with QX genotype by continuous passage in chicken embryos.
Vaccine - 2 Jan 2016
Huo Ya-fei, Huang Qing-hua, Lu Mei, Wu Jia-qiang, Lin Shu-qian, Zhu Fengzhu, Zhang Xiu-mei, Huang Yan-yan, Yang Shao-hua, Xu Chuan-tian
Abstract excerpt
The virulent isolate SDZB0808 of QX-type infectious bronchitis virus (IBV) was continuously passaged in chicken embryos for 110 generations. The safety and immune efficacy of the 110th generation of IBVs (P110) were evaluated. Damage was not found in the appearance of the 3-day-old specific-pathogen-free (SPF) chicks immunized with 10(4.5) EID50 (median embryo infective dose) of P110 by intranasal and ocular...
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