health
Is it true that... you have five seconds' grace after dropping food on the floor?
Many of us have reassured ourselves with the 'five second rule', but bacteria can transfer almost immediately – and sticks around for hours.
TL;DR
- Bacteria transfer to dropped food happens almost immediately, not after five seconds.
- Wet foods like watermelon transferred bacteria most efficiently to surfaces like tile and steel.
- Contaminated surfaces can transfer bacteria to food dropped hours later, with bacteria persisting for about 24 hours.
- Medical instruments dropped in operating rooms require detergent washing to be safe again.
- Rinsing dropped food with water is not enough to guarantee it is clean and safe to eat.