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Covid handwashing
1. Smokey Point Productions
Safety and Health Program
➧Handwashing
➧-Credit for slide show to Skaggs School of Pharmacy and
Pharmaceutical Sciences-
2. Effective Handwashing During the COVID-19 Pandemic
• How does the SARS-CoV-2 virus travel?
• What is the most effective way to remove virus
particles from my hands?
• What about using hand sanitizer?
3. How does the SARS-CoV-2 virus travel?
Through sneezes
Through coughs
Between people who are within
about 6 feet of one another
Touching an infected surface, then
touching your face (especially eyes,
nose and mouth)
Image by Robin Higgins on Pixabay
4. Why soap & water handwashing
is your #1 choice
➧ Coronavirus particles (virions) form weak chemical bonds
with cells on the surface of your skin
➧ Good handwashing with soap & water removes virus particles
in TWO significant ways
5. How soap & water handwashing works
➧ Scrubbing your hands with soap and water
physically overpowers the weak glue-like
bonds that exist between virus particles and
your skin cells
➧ Vigorously washing your hands for at least 20
seconds removes virus particles and allows
them to be rinsed away
MECHANISM #1 – physical
removal of the virus
6. Why soap & water handwashing is your #1 choice
(if you love science, this is so cool)
Soaps interact with the lipid (fatty) bilayer
in the envelope that surrounds viral RNA
and holds the virus together
Soap causes the lipid envelope to rip apart
and the coronavirus particle is destroyed
However, the soap needs enough time to work
(hence the 20-second rule! )
Pieces of destroyed virus particles are washed
down the drain
MECHANISM #2 –
destroying virus particles
7. Effective handwashing
➧ Handwashing using good technique is the BEST way to remove the virus
• Wet hands first with water, then apply soap (basic soap works fine)
• Produce lots of soapsuds
• Vigorously wash your hands for at least 20 seconds
• Don’t miss thumbs, wrists, between fingers, and other nooks and crannies
• Scrub the underside of fingernails every time your wash your hands
• Keep fingernails trimmed short to help keep them clean
• Rinse hands with water and dry thoroughly
8. Effective use of hand sanitizer
➧ Alcohol-based hand sanitizer kills coronavirus in a similar way
• Use sanitizer when soap and water is not handy
• If your hands are sweaty or visibly dirty, sanitizer won’t work very well.
Use soap and water instead.
• Use a sanitizer product with at least 60% alcohol content
• Apply sanitizer to one palm (read the label to learn the correct amount)
• Cover all surfaces of your hands and fingers to soak the virus in alcohol
• Be patient. Rub your hands together until they feel dry
9. To wrap up
➧Vigorous handwashing for 20 seconds with soap and water is the #1 choice
➧Hand sanitizer containing at least 60% alcohol, properly applied, is also effective
➧Regularly clean and disinfect frequently touched objects
• Tables, doorknobs, light switches, countertops, handles,
desks, phones, keyboards, toilets, faucets, sinks, tablets,
phones, touch screens, keyboards, remote controls
and other surfaces
10. References
➧ Palli Thordarson. The science of soap – here’s how it kills the coronavirus, in The Guardian, last updated March
18, 2020. Limited open license for educational use.
https://www.theguardian.com/commentisfree/2020/mar/12/science-soap-kills-coronavirus-alcohol-based-
disinfectants [accessed March 31, 2020].
➧ Hand Hygiene. Centers for Disease Control and Prevention. Available at
https://www.cdc.gov/oralhealth/infectioncontrol/faqs/hand-hygiene.html. [accessed March 31, 2020]
➧ Basic Scheme of a Virus image made available under the Creative Commons CC0 1.0 Universal Public Domain
Dedication. DEXi, August 22, 2017.
➧ Structure of an influenza virus. Modification of work by Dan Higgins, Centers for Disease Control and
Prevention. Available at https://tophat.com/marketplace/science-&-math/biology/textbooks/oer-openstax-
microbiology-openstax-content/1930/69842/ [accessed March 31, 2020].
➧ Resnick, B. How soap absolutely annihilates the coronavirus. Last updated Mar 27, 2020. Available at
https://www.vox.com/science-and-health/2020/3/11/21173187/coronavirus-covid-19-hand-washing-sanitizer-
compared-soap-is-dope [accessed March 31, 2020].
➧ Nail Hygiene. Centers for Disease Control and Prevention. Available at
https://www.cdc.gov/healthywater/hygiene/hand/nail_hygiene.html [accessed March 31, 2020].