CD44 and neoplasm: In addition, BG/Ag@EcN treatment significantly enhanced the ratios of CD8+ Tcm cells (Figure 7l) and CD8+ effector memory T (Tem) cells (CD44+CD62L‐CD8+CD3+CD45+ T cells) (Figure 7m) in blood compared with those of naïve mice, revealing that BG/Ag@EcN might efficiently induce immunological memory in 4T1 tumor‐bearing mice undergoing surgical tumor resection.