Germs in the Laundry
With the cold and flu season starting up, everyone starts asking germ questions. A familiar one is about germs in the laundry; what’s killed and what’s left. So I pulled out some published research that I thought would be helpful.
The best was a study conducted by Dr Chuck Gerba at the University of Arizona and presented at an American Society of Microbiologists meeting. He asks: What happens to the bacteria in laundry when it’s washed? To answer it, he swabbed the insides of 100 washers in Arizona and Florida to identify if they contained residual “bugs”. Are you ready? He found more than 60 percent of the machines tested positive for coliform bacteria, an indicator of fecal contamination. Another 20 percent contained staph. Dr. Gerba also confirmed the laundry bacteria is primarily from underwear, but also included bacteria often found in dishcloths and sponges.
Next he looked at what happens to bacteria during washing and drying. He used three different illness-causing bacteria for his tests: E. coli, Salmonella, and another common bacteria that causes skin infections (Mycobacterium fortuitium).
Simulating typical home-laundry practices using warm water washes, the researchers observed that after washing, bacterial contamination was found throughout the clothing and on the machine tub itself. The bacteria left behind even showed up in subsequent washloads. Oh my!!
Even more surprising, the heat from the dryer did not kill all the bacteria. The E. coli was eliminated, but the other two bacteria, although reduced, were still present. Drying times included 23-minute permanent press cycles and 43-minute cotton settings.
Equally concerning, your hands and the top of the washer and dryer come in contact with those germs as wet clothes are transferred from washer to dryer.
So a quick summary:
- Over ¾ of the washers had bacteria happily living in them and waiting for the next washload
- Most of the bacteria was from underwear
- Washing in warm water spread the bacteria to the rest of that load AND then left some behind for the next load
- You help spread the bacteria by touching/handling the wet laundry
- Dryer heat wasn’t enough to kill everything.
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