Nature Microbiology 1, 16131 (2016); published 8 August 2016; corrected 17 October 2016

In the original version of this paper, several of the bacterial genus and species names were incorrect or incompatible with formal taxonomic validation and have had to be modified. The relevant names and descriptions have been amended in all versions of the Article. In addition, Supplementary Figs 3,4 and Supplementary Tables 1,4,5,11 have been replaced.