Nat. Genet. 48, 308–313 (2016); published online 1 February 2016; corrected after print 6 March 2017

In the version of this article initially published, the titles of the x axes in Figure 5b and 5c should have been “Brain/blood CFU ratio” instead of “Blood/brain CFU ratio,” and the title of the z axis in Figure 2c should have been “% of isolates” instead of “Number of isolates.” The errors have been corrected in the HTML and PDF versions of the article.