Quantcast
Environmental News for a Healthier Planet and Life

Help Support EcoWatch

Your Washing Machine Can Be a Home for Bacteria — What You Should Know

Health + Wellness
Your Washing Machine Can Be a Home for Bacteria — What You Should Know
gerenme / iStock / Getty Images Plus

By Christopher Curley

Today's high-efficiency home washing machines might not be eliminating bacteria as thoroughly as their older, less-efficient counterparts.


This finding comes after a multidrug-resistant pathogen was found on the clothing of infants at a neonatal intensive care unit at a German children's hospital — despite all normal precautions being taken to eliminate exposure to such superbugs.

The eventual culprit, investigators found, was in the hospital's laundry room.

There the investigators found consumer-grade washing machines instead of the usual high-temperature industrial washing machines typically used in hospitals, researchers reported in the journal Applied and Environmental Microbiology.

Fortunately the infants were only exposed to the drug-resistant Klebsiella oxytoca pathogen but not actually infected, the researchers said.

What's in Your Washer?

But the findings raise the question: If the problem is a consumer-grade washing machine, do consumers need to be concerned about harmful bacteria lingering in their machines at home?

The answer is mixed.

"This was a washer in a hospital so it would be exposed to bacteria — such as this one — that thrive in hospital environments," Dr. Amesh Adalja, a senior scholar at the Johns Hopkins Center for Health Security in Maryland, told Healthline.

"This bacteria is resistant and can cause severe infections but still requires a susceptible host. Many people can be exposed to drug-resistant bacteria and even colonized with them — like are many healthcare workers — yet have no infections occur," he said.

But in order to save energy, today's high-efficiency machines wash clothes at lower temperatures — less than 140°F.

That means more bacteria survive the washing process, noted Ricarda M. Schmithausen, Ph.D., a lead author of the study and a senior physician at the Institute for Hygiene and Public Health at the WHO Collaboration Center at the University of Bonn, Germany, in an American Society for Microbiology press release.

In particular, the researchers found bacteria growing in the rubber seals of the washer, which then spread during the unheated rinse cycle.

Few Dangers — With Some Exceptions

However, most bacteria are benign or even beneficial.

"For those of us who use cold or warm water wash and efficient short-drying cycles, some hardy germs will be left on our linens and clothes, [but] the possibility of dangerous, resistant bacteria in our washing machines causing disease is very remote," Dr. Bruce Hirsch, attending infectious disease physician at North Shore University Hospital in Manhasset, New York, told Healthline.

"We're all exposed to bacteria all the time without illness. This story suggests that if a household has a family member with a recent prolonged hospitalization, hot water and prolonged drying should be considered," he said.

Dr. Martin Exner, chairman and director of the Institute for Hygiene and Public Health at the WHO Collaboration Center, University Hospital/University of Bonn, where the research was conducted, concurred in the study's press release.

"This is a growing challenge for hygienists, as the number of people receiving nursing care from family members is constantly increasing," he said.

Keeping Your Washer Clean

If you live with an elderly relative, vulnerable newborn or simply want to go the extra mile, you can take certain measures to keep your clothes and washing machine free of the worst bacterial contamination.

"Bacteria tends to lurk in the detergent drawer, rubber seals and washing drum," Hilary Metcalf, MPH, an infection preventionist at Mission Hospital in Orange County, California, told Healthline.

Consumers should be especially wary of washing machines kept in humid environments such as garages or sheds, since these are the perfect environments for bacteria to thrive.

And germs such as E. coli, salmonella and Klebsiella oxytoca can cause pneumonia, skin infections, abdominal cramps, vomiting and diarrhea, especially in people with compromised immune systems.

Try wiping down seals in your machine with a 10 percent bleach solution, some experts recommend.

You can also try washing your washer.

"It might seem counterintuitive, but washing your washing machine once a month can significantly reduce you and your family's exposure to germs and infections," Metcalf said.

There's no reason to fret over every wash cycle, however. Instead, choose your wash settings on a case-by-case basis depending on how the wash got dirty.

"Normal home laundering will adequately remove normal levels of soil. However, if contaminated with blood or bodily fluids, the laundering process should be enhanced with disinfecting solutions such as hydrogen peroxide, bleach or Borax, and in water that's at least 160°F," Metcalf said.

Many washers have a "sanitize" setting that will bring it up to these higher temperatures outside of its normal wash cycle.

And there's a more effective germ killer people can try to keep pathogens away from their clothes: drying them outside on the line.

"One of the most striking germ killers is the sun," said CJ Xia, vice president of marketing and sales at antibody manufacturing company Boster Biological Technology. "Some scientists say to avoid using the dryer entirely."

Reposted with permission from our media associate Healthline.

A meteorologist monitors weather in NOAA's Center for Weather and Climate Prediction on July 2, 2013 in Riverdale, Maryland. Mark Wilson / Getty Images

The Trump White House is now set to appoint two climate deniers to the National Oceanic and Atmospheric Administration (NOAA) in one month.

Read More Show Less

EcoWatch Daily Newsletter

A plastic bag caught in a tree in New Jersey's Palisades Park. James Leynse / Stone / Getty Images

New Jersey is one step closer to passing what environmental advocates say is the strongest anti-plastic legislation in the nation.

Read More Show Less

Trending

Did you know that nearly 30% of adults do, or will, suffer from a sleep condition at some point in their life? Anyone who has experienced disruptions in their sleep is familiar with the havoc that it can wreak on your body and mind. Lack of sleep, for one, can lead to anxiety and lethargy in the short-term. In the long-term, sleep deprivation can lead to obesity, diabetes, and cardiovascular disease.

Fortunately, there are proven natural supplements that can reduce insomnia and improve quality sleep for the better. CBD oil, in particular, has been scientifically proven to promote relaxing and fulfilling sleep. Best of all, CBD is non-addictive, widely available, and affordable for just about everyone to enjoy. For these very reasons, we have put together a comprehensive guide on the best CBD oil for sleep. Our goal is to provide objective, transparent information about CBD products so you are an informed buyer.

Read More Show Less
Speaker of the House Nancy Pelosi (D-CA) talks to reporters during her weekly news conference at the U.S. Capitol Visitors Center on Sept. 18, 2020 in Washington, DC. Chip Somodevilla / Getty Images

The House of Representatives passed a sweeping bill to boost clean energy while phasing out the use of coolants in air conditioners and refrigerators that are known pollutants and contribute to the climate crisis, as the AP reported.

Read More Show Less
Gov. Jay Inslee of Washington comforts Marsha Maus, 75, whose home was destroyed during California's deadly 2018 wildfires, on March 11, 2019 in Agoura Hills, California. Mel Melcon / Los Angeles Times / Getty Images

By Governor Jay Inslee

Climate Week this year coincides with clear skies in Washington state for the first time in almost two weeks.

In just a few days in early September, Washington state saw enough acres burned – more than 600,000 – to reach our second-worst fire season on record. Our worst fire season came only five years ago. Wildfires aren't new to the west, but their scope and danger today is unlike anything firefighters have seen. People up and down the West Coast – young and old, in rural areas and in cities – were choking on smoke for days on end, trapped in their homes.

Fires like these are becoming the norm, not the exception.

Read More Show Less

Support Ecowatch