This is the peer reviewed version of the following article: Farhan, R. K., Vickers, M. A., Ghaemmaghami, A. M., Hall, A. M., Barker, R. N. and Walsh, G. M. (2016), Effective antigen presentation to helper T cells by human eosinophils. Immunology, 149: 413–422. which has been published in final form at DOI: 10.1111/imm.12658. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.