Teachey et al. [9] compared cytokine profiles in patients who underwent CD19 CAR T therapy, and reported higher levels of IFN-γ, IL-6, IL-8, sIL-2Rα, sgp130, sIL-6R, MCP-1, MIP-1α, MIP-1β, and GM-CSF were associated with grade 4–5 CRS. Here, CSF2 is linked to congenital rubella syndrome.