Color-Changing Biogel Test Offers Quick Detection of Harmful Bacteria

A team of engineers and biochemists at **McMaster University** has introduced an innovative biogel test that simplifies the detection of bacteria such as *E. coli* and *listeria* in fluids. The test employs harmless **bacteriophages** embedded in a gel medium. These phages locate and attack target bacteria, causing a release of intracellular material that triggers a visible color change in the biogel. This process allows even untrained individuals to detect bacteria in various fluids, including lake water, urine, and milk, within hours, a significant improvement over traditional lab cultures that require days. This cutting-edge method is part of a series from the research group, whose past projects include phage libraries for antibiotic-resistant infections and contamination detection integrated into food packaging. **Zeinab Hosseinidoust**, the study's senior author and Canada Research Chair in Bacteriophage Bioengineering, highlights the versatility of this approach, which can be adapted to detect multiple bacterial strains. Recent tests confirm that results are consistent with those from conventional lab analyses. The researchers aim to partner with commercial entities to make this user-friendly test widely available, potentially revolutionizing food safety, clinical diagnostics, and environmental monitoring.