Correction to: Nature Reviews Microbiology https://doi.org/10.1038/s41579-021-00567-y, published online 04 June 2021.

In the originally published article the credit line was omitted from the caption for Figure 3a. This has been corrected in the HTML and PDF versions of the article, to state that the design of the squid in Figure 3a is courtesy of Kathryn Bellissimo. We apologize to the authors and Kathryn Bellissimo for this error.