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* 03-16-20
* [57]evidence
[58]Copper kills coronavirus. Why aren’t our surfaces covered in it?
Civilizations have recognized copper’s antimicrobial properties for
centuries. It’s time to bring the material back.
Copper kills coronavirus. Why aren’t our surfaces covered in it?
[Source Images: ekimckim/[59]Blendswap (toilet),
blenderjunky/[60]Blendswap (bathroom)]
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[61]By Mark Wilson5 minute Read
In China, it was called “qi,” the symbol for health. In Egypt it was
called “ankh,” the symbol for eternal life. For the Phoenicians, the
reference was synonymous with Aphrodite—the goddess of love and beauty.
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These ancient civilizations were referring to copper, a material that
cultures across the globe have recognized as vital to our health for
more than 5,o00 years. When [62]influenzas, bacteria like [63]E. coli,
superbugs like MRSA, or even coronaviruses land on most hard surfaces,
they can live for up to four to five days. But when they land on
copper, and copper alloys like brass, they begin to die within minutes
and are [64]undetectable within hours. “We’ve seen viruses just blow
apart,” says Bill Keevil, professor of environmental healthcare at the
University of Southampton. “They land on copper and it just degrades
them.”
No wonder that in India, people have been drinking out of copper cups
for millennia. Even here in the United States, a copper line brings in
your drinking water. Copper is a natural, passive, antimicrobial
material. It can self-sterilize its surface without the need for
electricity or bleach.
Copper boomed [65]during the Industrial Revolution as a material for
objects, fixtures, and buildings. Copper is still widely used in power
networks—the copper market is, in fact, growing because the material is
such an effective conductor. But the material has been pushed out of
many building applications by a wave of new materials from the 20th
century. Plastics, tempered glass, aluminum, and stainless steel are
the materials of modernity—used for everything from architecture to
Apple products. Brass door knobs and handrails went out of style as
architects and designers opted for sleeker-looking (and often cheaper)
materials.
Now Keevil believes it’s time to bring copper back in public spaces,
and hospitals in particular. In the face of an [66]unavoidable future
full of global pandemics, we should be using copper in healthcare,
public transit, and even our homes. And while it’s too late to stop
COVID-19, it’s not too early to think about our next pandemic.
The benefits of copper, quantified
We should have seen it coming, and in reality, someone did.
In 1983, medical researcher Phyllis J. Kuhn [67]wrote the first
critique of the disappearance of copper she’d noticed in hospitals.
During a training exercise on hygiene at Hamot Medical center in
Pittsburgh, students swabbed various surfaces around the hospital,
including toilets bowls and door knobs. She noticed the toilets were
clean of microbes, while some of the fixtures were particularly dirty
and grew dangerous bacteria when allowed to multiply on agar plates.
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[Photo: Backiris/iStock]“Sleek and shining stainless steel doorknobs
and push plates look reassuringly clean on a hospital door. By
contrast, doorknobs and push plates of tarnished brass look dirty and
contaminating,” she wrote at the time. “But even when tarnished,
brass—an alloy typically of 67% copper and 33% zinc—[kills bacteria],
while stainless steel—about 88% iron and 12% chromium—does little to
impede bacterial growth.”
Ultimately, she wrapped her paper up with a simple enough conclusion
for the entire healthcare system to follow. “If your hospital is being
renovated, try to retain old brass hardware or have it repeated; if you
have stainless steel hardware, make certain that it is disinfected
daily, especially in critical-care areas.”
Decades later, and admittedly with funding from the [68]Copper
Development Association (a copper industry trade group), Keevil has
pushed Kuhn’s research further. Working in his lab with some of the
most feared pathogens in the world, he has demonstrated that not only
does copper kill bacteria efficiently; it also kills viruses. (In 2015,
he even [69]demonstrated this phenomenon with a precursor to COVID-19,
coronavirus 229E).
In Keevil’s work, he dips a plate of copper into alcohol to sterilize
it. Then he dips it into acetone to get rid of any extraneous oils.
Then he drops a bit of pathogen onto the surface. In moments it’s dry.
The sample sits for anywhere from a few minutes to a few days. Then he
shakes it in a box full of glass beads and a liquid. The beads scrape
off bacteria and viruses into the liquid, and the liquid can be sampled
to detect their presence. In other cases, he has developed microscopy
methods which allow him to watch—and record—a pathogen being destroyed
by copper the moment it hits the surface.
The effect looks like magic, he says, but at this point, the phenomena
at play is well-understood science. When a virus or bacteria strikes
the plate, it’s flooded with copper ions. Those ions penetrate cells
and viruses like bullets. The copper doesn’t just kill these pathogens;
it destroys them, right down to the nucleic acids, or reproductive
blueprints, inside.
“There’s no chance of mutation [or evolution] because all the genes are
being destroyed,” says Keevil. “That’s one of the real benefits of
copper.” In other words, using copper doesn’t come with the risk of,
say, over-prescribing antibiotics. It’s just a good idea.
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In real-world testing, copper proves its worth
Outside of the lab, other researchers have tracked whether copper makes
a difference when used in real-life medical contexts–which includes
hospital door knobs for certain, but also places like hospital beds,
guest-chair armrests, and even IV stands.
In 2015, researchers working on a Department of Defense grant compared
infection rates at three hospitals, and found that when copper alloys
were used in three hospitals, it [70]reduced infection rates by 58%. A
similar study was done in 2016 inside a pediatric intensive care unit,
which charted [71]a similarly impressive reduction in infection rate.
But what about expense? Copper is always more expensive than plastic or
aluminum, and often a pricier alternative to steel. But given that
hospital-borne infections are costing the healthcare system as much as
[72]$45 billion a year—not to mention killing as many as 90,000
people—the copper upgrade cost is negligible by comparison.
Keevil, who no longer receives funding from the copper industry,
believes the responsibility falls to architects to choose copper in new
building projects. Copper was the first (and so far it is the last)
antimicrobial metal surface approved by the EPA. (Companies in the
silver industry tried [73]and failed to claim it was antimicrobial,
which actually [74]led to an EPA fine.) Copper industry groups have
registered over 400 copper alloys with the EPA to date. “We’ve shown
copper-nickel is just as good as brass at killing bacteria and
viruses,” he says. And copper nickel doesn’t need to look like an old
trumpet; it’s indistinguishable from stainless steel.
As for the rest of the world’s buildings that haven’t been updated to
rip out the old copper fixtures, Keevil has a piece of advice: “Don’t
remove them, whatever you do. These are the best things you’ve got.”
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About the author
Mark Wilson is a senior writer at Fast Company who has written about
design, technology, and culture for almost 15 years. His work has
appeared at Gizmodo, Kotaku, PopMech, PopSci, Esquire, American Photo
and Lucky Peach
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