Nature Reviews Immunology (2020) https://doi.org/10.1038/s41577-020-0320-7 Published online 23 April 2020

In the originally published article, Cecilia Garlanda’s affiliations were incompletely listed as 5Humanitas Clinical and Research Center, Milan, Italy and 6Humanitas University, Milan, Italy.

These have now been corrected to 5Humanitas Clinical and Research Center, IRCCS, Rozzano, Milan, Italy and 6Humanitas University, Pieve Emanuele, Milan, Italy.