Compliance with Ethical Standards
Acknowledgements: This work was supported by the National
Natural Science Foundation of China (31702271), the Guangdong Provincial
Natural Science Foundation (2017A030310367),the Special Fund for
Agro-scientific Research in the Public Interest (201303042), the
National Key Research and Development Program of China (2016YFD0501004,
2016YFD0501010), the Promote Scientific and Technological Development
Program (2013B040200032), and the Guangdong Provincial Key Laboratory of
Prevention and Control for Severe Clinical Animal Diseases
(2013A061401013).
Conflict of Interest Statement: The authors declare no
conflicts of interest.
Ethical Approval: No studies involving human participants or
animals performed by any of the authors are described in this article.
Data Availability Statement: The data that support the findings
of this study are available from the corresponding author upon
reasonable request.