LUBBOCK, TX – Foodborne illness remains a real concern, but some of the bacteria people encounter every day may be hiding in less obvious places. A small surface-testing study found train tray tables produced substantially more bacterial colony growth than toilet seats, trash cans, or several other commonly touched surfaces.
Japan Rail Pass provider JRPass tested eight types of train surfaces using swabs and nutrient agar. Tray tables produced the most growth, measuring 9.5 times more colonies than trash cans. Armrests ranked second, followed by toilets and restroom surfaces.
University of Arizona microbiologist Chuck Gerba says tray tables receive frequent hand and food contact and may not be cleaned as often as toilets. Similar research has also found potentially harmful organisms on transportation surfaces.
The findings do not mean a tray table is necessarily more dangerous than a toilet seat. Only three items from each category were sampled, and bacterial colony counts do not identify whether organisms are harmful or measure actual illness risk.
The practical lesson is simple: wash hands, avoid placing food directly on shared surfaces, and clean frequently handled items such as phones and travel mugs.
Farm-Level Takeaway: Basic handwashing and clean food-contact surfaces remain important protections against everyday bacterial exposure.