As shown in Figure 4A, intracellular cytokine staining and flow cytometric analysis demonstrated a significant decrease in the proportion and absolute number of IL‐17+ CD4+ T cells in NK cell‐depleted mice compared with control mice in spleen, lung and mediastinal lymph node cells on day 6 and 12 after infection (Fig. 4B–G). The gene discussed is IL17A; the disease is infection.