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After publication of the article , it has been brought to our attention that an acknowledgement has been omitted from the original article. The authors would like to include the following, The authors also thank Prof. En-Min Zhou (Northwest A&F University) and his laboratory for technical support.”
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The online version of the original article can be found under doi:10.1186/s13567-017-0445-2.
Yanming Zhang, Email: nc.ude.fauswn@mygnahz.
Levon Abrahamyan, Email: firstname.lastname@example.org.