CCR2 and infection: As expected, we found that CCL11 together with CCL2, CCL3, and the receptors CCR2, CCR3, and CCR5 were all upregulated in newly-weaned hamster brain tissues after Delta variant infection at 2, 4, and 7 dpi, of which CCL11 and CCR2 were significantly higher at 4 dpi (Figure 3(B)).