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. 2021 Jun 4;8:680707. doi: 10.3389/fvets.2021.680707

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Copyright © 2021 Xie, Lv, Wen, Zhai, Luo, Wei, Chen and Zhai.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Standard curve. Correlation between cycle threshold value (y-axis) and the logarithm of concentration of 10-fold-diluted pMD19-bovine rhinitis B virus (BRBV) (x-axis). The x-axis in the graph starts from the logarithm of concentration of 2.23 × 10⁰ copies/μl. The standard equation is y = −3.29 × Lg Con. + 37.17.