Tel Aviv University and Israel Institute for Biological Research scientists have enhanced their 2023 creation (see here) of the world’s first mRNA-based vaccine against bubonic plague which is spread through the skin (flea bites). The new vaccine protects against pneumonic plague (spread via the air).
https://english.tau.ac.il/research/mrna-vaccine-stops-deadly-plague
https://advanced.onlinelibrary.wiley.com/doi/10.1002/advs.202501286