There were a similar profile of mRNA expression among SLA-DM, CD80, and CD86, they declined to neap at 3 DPI, ascended quickly at 7 DPI, resumed to normal thereafter.

• SLA-DM、CD80与CD86的mRNA含量变化趋势相似，均是在感染后第3天时降到最低，7天时快速上升，21天以后基本恢复正常。