Nat. Immunol. 17, 1263–1272 (2016); published online 26 September 2016; corrected after print 20 March 2017

In the version of this article initially published, the label along the horizontal axis of the graph in Figure 1a ('Dose (mg)') is incorrect. The correct label is 'Dose (μg)'. The error has been corrected in the HTML and PDF versions of the article.