Escherichia coli infections can stimulate the expression of 4‐1BBL and membrane‐bound IL‐15 by DCs,57 enabling these APCs to trigger and support NK cell proliferation21 and parodied by the use of 4‐1BBL‐ and IL‐15‐expressing aAPCs to numerically expand NK cells for adoptive cell therapy.19, 26. The gene discussed is IL15; the disease is escherichia coli infection.