The OT‐I CD44+ cell response peaked later on day 14 post‐infection in the spleen, the major site of T‐cell priming and the dominant organ for effector T‐cell responses during malaria [40], compared with the lung and brain and, as expected, a large OT‐I CD44+ cell population was maintained in the spleen on day 60 pi (Figure 1h–j). Here, CD44 is linked to malaria.