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αβ T cells are required for protection against respiratory NMFTA1 infection. Naïve (A) and vaccinated (B) BALB/c mice (n = 5) were depleted of CD4, CD8, or both CD4 and CD8 T cells by intraperitoneal injection of ascites fluid. Three days after antibody treatment, the T-cell-depleted mice were challenged i.n. with 2 × 102 CFU of NMFTA1.
