Given that MO49 and IL52 differed in the frequency of paralysis following infection of mice (Figure 1D), we focused on differences in the cytokines induced by these strains and observed that levels of CCL2 (MCP-1 in the human organoid cytokine panel), CCL7, and CCL12 were substantially higher following infection with paralysis-inducing strain IL52. Here, CCL2 is linked to infection.