Nat. Immunol. 16, 448–457 (2015); published online 21 April 2015; corrected after print 17 August 2017

In the version of this article initially published, some of the labels in Figure 4a,b were incorrect. In Figure 4a, in the group of IL-6 blockers (top right), 'ALX-0061' should be removed and 'Siltuximab' and 'MEDI 5117' should be added, and in the group of IL-6R blockers (middle right), 'Siltuximab' and 'ALD518' should be removed and 'ALX-0061' should be added. In Figure 4b, in the group of inhibitors at bottom left, 'MEDI 5517' should be revised to 'MEDI 5117'. These errors have been corrected in the HTML and PDF versions of the article.