In the version of the article initially published, in the “Effector-triggered immunity” section, the sentence now reading “Bacteria detect phage by monitoring transcription using a constitutively produced antitoxin ToxI, which is depleted when phage inhibit transcription, releasing the RNase ToxN that aborts phage infection” read “Bacteria link phage detection to cell death by monitoring transcription using constitutively produced antitoxin ToxI, which is depleted when phage inhibit transcription, releasing ToxN and killing the cell.” This has been corrected in the HTML and PDF versions of the article.