TSPO and infection: In contrast to microglia and monocytes, TSPO expression in granulocytes transiently increased at mid disease relative to pre-infection (2.1-fold higher, p = 0.004) (Fig. 3b, Table S2), and the strength of correlation between granulocyte TSPO expression during disease and brain tracer uptake (ρ = 0.77; p = 0.009) was weaker than either microglia or monocytes (ρ = 0.89–0.92) (Fig. 3f).