Eosinophils can more than kill

In this issue of JEM, Arnold et al. (https://doi.org/10.1084/jem.20172049) demonstrate that eosinophils suppress mucosal inflammation by directly interacting with pro-inflammatory Th1 cells. This emphasizes the dual role of eosinophils, which can act both as effector cells that control an infection and as immunomodulatory cells that promote immune homeostasis.