Funding
This study was supported by the biosafety Key Special Projects (2019YFC1200705), Major Special Projects for Infectious Disease (Nos. 2017ZX10303401, 2018ZX10734401, and 2018ZX10734404), and the Nature Science Fund of the Inner Mongolia Autonomous Region (No. 2018MS08004). The funding agencies had no role in the study design, data collection, and analysis, decision to publish, or preparation of the manuscript.