Hebrew University of Jerusalem researchers have found a tiny RNA molecule called PreS that enables a bacteriophage (a bacteria-eating virus) to take control of a bacterial cell. The harmless phage uses it to grow but destroys the dangerous bacterium in the process.

https://www.timesofisrael.com/newly-discovered-rna-molecule-could-lead-to-new-treatments-in-the-war-against-superbugs/

https://www.jpost.com/science/article-880658