Compared with the normal mice, the proportion of CD11b+CD45+ cells in the ECM brain showed a significant increase on the 3rd day (p = 0.0425) post‐infection and increased continuously on the 5th day (p = 0.0065) and 7th day (p = 0.0015), while the increased quantity of CD11b+CD45+ cells was obvious on the 3rd day (p = 0.0476), 5th day (p = 0.0063), and 7th day (p = 0.0012) after infection (Figure 2B). The gene discussed is PTPRC; the disease is infection.