To figure out the influence of eosinophils on CD8+ T cell fate and response, we utilized ∆dblGATA-1 mice that completely lack eosinophils26 and established primary and secondary infection model by intraperitoneal (i.p.)injection of L.m.-OVA to WT and ∆dblGATA-1 mice (Fig. 1a). The gene discussed is CD8A; the disease is infection.