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April 30, 2020
By Fred MillerU of A System Division of Agriculture@AgNews479
Download MS Word version
Download related PHOTOSKristen Gibson: https://flic.kr/p/2iB1AhuCleaning a cell phone: https://flic.kr/p/2iVKxVa
FAYETTEVILLE, Ark. — So, you just had to slip out of COVID-19 isolation to pick up
a few essentials at the grocery. You observed social distancing, wore a mask and,
after you returned home and put your treasures away, you washed your hands and cleaned
your kitchen surfaces just to play it safe.
So far so good.
One question — where was your smartphone while you were out there?
Research has shown that SARS-CoV-2, the virus that causes COVID-19, transfers from
infected people onto surfaces by touching, coughing or sneezing, said Kristen Gibson,
associate professor of food safety and microbiology for the Arkansas Agricultural
Experiment Station, the research arm of the University of Arkansas System Division
From those surfaces, the virus can transfer to any human hands that touch them. Cell
phones have surfaces, Gibson said, and she’s especially mindful of touchscreen smartphones.
“Touchscreens are high-touch surfaces, just like doorknobs and elevator buttons,”
The greatest risk, Gibson said, is touchscreens that are tapped and prodded by multiple
users, like self-checkout screens at many stores, or the ones you sign with your fingertip
after swiping a credit card at the coffee shop drive-thru.
But the phone in your pocket is also at risk of exposure, Gibson said. A person’s
hands touch those public surfaces, then transfer whatever they pick up to their phone.
Gibson recommends not using a cell phone while out running errands — especially during
the COVID-19 pandemic. Leave it in a pocket or purse until returning home and washing
hands. But if that’s not possible, she advises cleaning the phone as soon as you return
It’s best, she said, to clean the phone first, using a damp screen-cleaning cloth
or a dry microfiber cloth. Then wash your hands. “The other way around, you risk contaminating
your washed hands while handling the phone to clean it.”
And remember, cell phones have surfaces on the back and sides, too. Gibson said it’s
important to clean every surface.
Research conducted by a University of Arkansas undergraduate honors student under
Gibson’s advisement in Dale Bumpers College of Agricultural, Food and Life Sciences
showed that a screen cleaning wipe with isopropyl alcohol and a dry microfiber cloth
were equally effective at removing bacteria from smartphone surfaces. Research by
other institutions has shown similar results removing viruses from different kinds
of surfaces, and Gibson believes such results would transfer to cell phone surfaces.
“And if your phone is in a case,” Gibson said, “you can remove it and clean the case
with warm, soapy water, or use a disinfectant wipe.”
She added that spray disinfectants may also be useful, but said she would not use
one unless the product is recommended for use on electronic devices.
Concerning those multiuser touchscreens, Gibson said she uses her knuckles instead
of her fingertips to tap those. She said stylus pens that have rubber tips for use
on smartphones and tablets may also be a good idea to avoid touching fingers to public
Gibson said alcohol-based hand sanitizers are a good intermediary step to clean hands
while out and about. But she said wash your hands when you return home.
World Health Organization research has shown that sanitizer formulations vary among
products. “Tests show they all have some ability to inactivate viruses,” Gibson said,
“but some are more effective than others. And things like how long we rub our hands
make a difference.”
“There’s a lot of variability in the products, in terms of alcohol content and use
of other ingredients,” Gibson said. “We can’t be certain they remove every trace of
“Washing your hands vigorously with soap and water for at least 20 seconds is the
only completely reliable method to be sure your hands are sanitized,” she said.
Gibson said much research remains to be done to measure the effectiveness of various
cleaning products and methods. Much research has been done for removing viruses from
surfaces in clinical settings, but little has been done in this regard for food industry
environments or other places, like homes.
“What we don’t know is what cleaning products or protocols are most effective,” she
said. “What is the transmission rate from surfaces to hands? These areas require investigation.”
To learn more about Division of Agriculture research, visit the Arkansas Agricultural
Experiment Station website: https://aaes.uark.edu. Follow us on Twitter at @ArkAgResearch and Instagram at ArkAgResearch.
About the Division of Agriculture
The University of Arkansas System Division of Agriculture’s mission is to strengthen
agriculture, communities, and families by connecting trusted research to the adoption
of best practices. Through the Agricultural Experiment Station and the Cooperative
Extension Service, the Division of Agriculture conducts research and extension work
within the nation’s historic land grant education system.
The Division of Agriculture is one of 20 entities within the University of Arkansas
System. It has offices in all 75 counties in Arkansas and faculty on five system campuses.
The University of Arkansas System Division of Agriculture offers all its Extension
and Research programs and services without regard to race, color, sex, gender identity,
sexual orientation, national origin, religion, age, disability, marital or veteran
status, genetic information, or any other legally protected status, and is an Affirmative
Action/Equal Opportunity Employer.
Media Contact: Fred MillerU of A System Division of AgricultureArkansas Agricultural Experiment Station(479) email@example.com