Virginia Tech Engineered Gut Bacterium Prevents Salmonella Infection in Mice
A probiotic E. coli that produces lytic phage seeds the gut with virus that kills Salmonella, offering a potential model for pathogen-specific preventive tools pending safety tests.
Overview
- The study, published in Nature Microbiology on Sept. 16, 2026, found that giving mice a nonpathogenic E. coli engineered to carry a lytic phage before exposure reduced intestinal Salmonella colonization and improved survival.
- Researchers built a ‘lytic phage‑producing lysogen’ by moving a Salmonella-targeting prophage into E. coli so the commensal colonizes the gut and continuously produces lytic phage at high levels.
- The team added a Salmonella gene to the engineered E. coli so the phage is not recognized as foreign, which lets the phage infect, replicate inside, and lyse Salmonella cells within the gut.
- In the mouse model the prophylactic lyto-lysogen outperformed giving free phage or delivering phage after infection, but the results are limited to animals and do not yet address human safety or regulatory hurdles.
- The work was funded by NIGMS (NIH) and a PhRMA Foundation fellowship and the authors say the approach could be adapted to other bacterial targets if further preclinical and safety testing support translation to humans.