Quick Overview
Scientists at Rutgers University tested the five-second rule with extreme care. They dropped four foods onto four common surfaces for less than 1, 5, 30 and 300 seconds. They repeated every combination 20 times, creating 2,560 measurements.
Results showed longer contact times increased bacterial transfer. Yet transfer often began almost instantly. Food moisture and surface type mattered just as much as time. Watermelon picked up far more bacteria than gummy candy. Carpet transferred the least.
Published in the peer-reviewed journal Applied and Environmental Microbiology, the study is solid and transparent. Readers who want the full numbers and practical kitchen takeaways will find them in the complete post.
We always provide direct links to the original research at the end of every article so you can review the evidence yourself.
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Research Summary
| Key Detail | Information |
|---|---|
| Full Title | Longer Contact Times Increase Cross-Contamination of Enterobacter aerogenes from Surfaces to Food |
| Authors | Robyn C. Miranda and Donald W. Schaffner |
| Research Institution | Rutgers, The State University of New Jersey, New Brunswick, New Jersey, USA |
| Journal | Applied and Environmental Microbiology |
| Publisher | American Society for Microbiology |
| Publication Year | 2016 (accepted manuscript posted online 2 September 2016) |
| Volume and Pages | Volume 82, Number 21, pages 6490–6496 |
| Bacterium Used | Non-pathogenic Enterobacter aerogenes B199A (chosen for attachment traits similar to Salmonella) |
| Surfaces Tested | Stainless steel, ceramic tile, maple laminate wood, and indoor-outdoor carpet |
| Foods Tested | Watermelon, plain bread, bread with butter, and gummy candy |
| Contact Times Measured | Less than 1 second, 5 seconds, 30 seconds, and 300 seconds |
| Total Measurements | 128 different scenarios, each repeated 20 times (2,560 individual measurements) |
| Starting Bacterial Level | Approximately 10⁷ CFU per 25 cm² surface after 5 hours of drying |
| Main Statistical Finding | Contact time, food type and surface type all had highly significant effects on bacterial transfer (P < 0.000001) |
| Original Study Link | https://doi.org/10.1128/AEM.01838-16 |
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