Eosinophils, primitive cells of the innate immune system primarily studied in allergic diseases, have recently garnered attention for their role in promoting antitumour immune responses (Grisaru-Tal et al., 2022; O'Flaherty et al., 2017; Blomberg et al., 2023) demonstrated that eosinophils can enhance NK cell chemotaxis and activation via secretion of CCL5, CXCL10 and IL-12. This evidence concerns the gene CCL5 and allergic disease.