Buzz
Hand sanitizer has been flying off the shelves, with two stores I visited last weekend completely sold out. A viral tweet has also been spreading misinformation, claiming it’s ineffective against viruses. To clarify, hand sanitizer can indeed kill coronavirus, but it’s not essential for your safety.
What is the mechanism behind hand sanitizer?
The alcohol in hand sanitizer breaks down the protective outer layer of many germs, though it’s less effective against bacterial spores or non-enveloped viruses. However, it does work against most other pathogens.
Coronaviruses possess an outer envelope, which is advantageous in this context.
Are hand sanitizers part of the guidelines for preventing coronavirus?
Absolutely. The CDC, for instance, mentions this advice on their COVID-19 protection page:
When soap and water aren’t accessible, opt for an alcohol-based hand sanitizer containing at least 60% alcohol. However, always wash your hands with soap and water if they are visibly soiled.
Not every hand sanitizer contains alcohol, so it’s crucial to verify the label.
Is handwashing more effective than using hand sanitizer?
Yes, though hand sanitizer serves as a useful alternative when soap and water aren’t available or if your hands are visibly soiled.
Substances like mucus or dirt on your hands can shield microorganisms from the alcohol’s effects. Therefore, washing your hands is essential if they aren’t clean.
When washing your hands, any soap will do (antibacterial isn’t necessary), and scrub for at least 20 seconds, roughly the time it takes to hum “Happy Birthday” twice.
