What if it is all bs and Serratia marcescens is just called all those different fictional demons and you can control it with Xylitol.
Xylitol acts as a potent growth and virulence inhibitor against Serratia marcescens, an opportunistic nosocomial pathogen known for causing antibiotic-resistant wound and burn infections. Research published in Microorganisms (2021) demonstrates that xylitol targets quorum sensing (QS), the bacterial communication system that regulates virulence, thereby disarming the bacteria without applying lethal stress that typically drives antibiotic resistance.
Key antivirulence effects of sub-inhibitory xylitol concentrations include:
Biofilm Inhibition: Reduces biofilm formation by 74.22–81.03%, preventing bacterial adherence and protection.
Motility Suppression: Blocks swimming motility by ~93% and swarming motility by ~90%, limiting the bacteria's ability to spread and infect tissues.
Virulence Factor Blockade: Completely inhibits protease activity and significantly reduces prodigiosin (red pigment) production.
Gene Downregulation: Significantly decreases the expression of critical virulence genes, including rsmA, pigP, flhC, flhD, fimA, fimC, shlA, bsmB, and rssB.
Mechanistically, xylitol interferes with the SmaR receptor by binding via hydrophobic interactions and hydrogen bonding, which prevents the natural ligand (C4-HSL) from activating virulence pathways. This antivirulence strategy enhances the host immune system's ability to eradicate the bacteria and has been shown to increase mouse survival rates from 60% to 100% in in vivo survival tests, suggesting potential therapeutic applications for treating resistant S. marcescens infections.