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Your sink is a breeding ground for bacteria that cause pneumonia and Legionnaires’ disease. How to keep it clean
By Lindsey Leake,
9 hours ago
As cold and flu season begins—and COVID continues to spread —you may be washing your hands more than usual. But how often do you clean the place you clean your hands? When it comes to dangerous microbes, new research out of Australia suggests your sink comes close to carrying everything but, well, the kitchen sink.
Both hospital and residential sinks are breeding grounds for pathogens capable of causing illnesses including pneumonia , wound infections , and Legionnaires’ disease , a severe type of pneumonia stemming from Legionella bacteria, according to researchers at Flinders University in South Australia. Their findings were published this summer in the journal Science of the Total Environment .
On top of that, residential sinks showed not only a higher number of Legionella bacteria compared to hospital sinks, but also a more diverse bacterial community, Whiley said.
The slimy substance that builds up on sink drains, bowl edges, and faucet bases is far from harmless gunk. It’s a fine layer of bacteria called biofilm, which can pose a public health risk. Handwashing sinks are a recognized source of HAIs, which globally impact 7% of high-income and 15% of low- and middle-income hospital patients, according to the World Health Organization . In this study, researchers sought to explore the bacterial diversity of sink biofilm in homes and hospitals.
The team analyzed 40 biofilm samples that had been “opportunistically” collected from the faucets and drains of nine hospital sinks in New South Wales and eleven residential sinks in South Australia. Researchers collected the residential samples from bathroom sinks and hospital samples from patient ensuite bathrooms, communal hallway sinks, and a staff room sink.
In addition to Legionella, they found more than a dozen potentially pathogenic bacteria including Staphylococcus , which causes staph infections, and Vibrio, the culprit behind cholera ( Vibrio cholerae ) and rare flesh-eating infections ( Vibrio vulnificus ). Some of the identified bacteria aren’t typically found in water. Residential sinks had significantly higher relative abundances of seven kinds of potentially pathogenic or corrosive bacteria.
Hospitals have infection control practices in place that include the routine cleaning of sinks. Patients receiving residential health care need to be informed of how they can adequately disinfect sinks at home, Hayward said.
The harboring of dangerous microbes in sink biofilms could increase the rise of antimicrobial resistance , she added.
How to clean, sanitize, and disinfect household sinks
Assuming you wash your hands before each meal and after each bathroom break—not to mention food preparation and teeth brushing—the kitchen and bathroom sinks in your home take a beating, bacterially speaking. Thoroughly washing such hard surfaces in your home is a three-step process that should always occur in the following order, according to the Centers for Disease Control and Prevention :
Cleaning
Physically removes most dirt, germs, and impurities
Use soap or detergents with water to scrub, wash, and rinse
Should be performed regularly
Sanitizing
Reduces the number of germs to levels considered safe
Use weaker bleach solutions or sanitizing sprays
Sanitize objects and surfaces that come in contact with mouths (such as toys, infant feeding supplies, countertops, and other surfaces that touch food)
Disinfecting
Kills remaining germs, further lowering the risk of spreading disease
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