We don’t yet have an
in-depth understanding of the novel coronavirus, including how it’s transmitted
through the air. But a recent preliminary study published in the New England
Journal of Medicine gives us some clues.
Part of the reason the
coronavirus is so frightening is its invisibility. We can’t see where it
lingers and have no idea if we’re coming into contact with it. Sure, we’re
social distancing (if you’re not, you better start) but can we still encounter
the virus in the air at the grocery store or outside?
Researchers examined how
long the coronavirus lasted on surfaces like steel and plastic (up to three
days ― yikes). They also looked at how long the virus stayed in the air in the
form of an “aerosolized particle.”
Aerosolized particles are
essentially microscopic, and they’re formed when fluids containing the virus
are expelled from a person and cling to dust or moisture in the air and hang
there. The researchers found that airborne coronavirus particles stayed
floating for up to three hours before falling and clinging to a new surface.
Before you panic, there’s
something important to note: This study was conducted in a very controlled setting.
The likelihood of encountering the virus in this form is low for an average
person, experts have previously told HuffPost. The virus doesn’t stay in the
air enough to be a risk to people who are not physically near someone who is
infected.
This is because droplets
from someone sneezing or coughing are typically much heavier than an
aerosolized particle.
“The experimental aerosols
used in labs are smaller than what comes out of a cough or sneeze, so they
remain in the air at face-level longer than heavier particles would in nature,”
Carolyn Machamer, a professor of cell biology whose lab at the Johns Hopkins
School of Medicine, said in a Q&A.
However, the phenomenon is
a concern for health care workers. Aerosolized particles can easily form in
medical settings during intubation or some other types of procedures like
scoping or CPR. This is why proper protective equipment like respirator masks are
so imperative for people on the front lines of the pandemic.
You should not be
excessively worried about encountering the coronavirus in the air on your daily
walk around the neighborhood.
Linsey Marr, an expert in
virus transmission by aerosol at Virginia Tech in Blacksburg, told the New York
Times that you should think of airborne coronavirus transmission like cigarette
smoke. Marr, who was not affiliated with the study, said that the closer and
sooner you are exposed to the person who exhaled the smoke, the more of a whiff
you might get. The exposure decreases the further away you are and the longer
the time has passed.
“It sounds scary,” she
said, referring to the study’s findings, “but unless you’re close to someone,
the amount you’ve been exposed to is very low.”
In other words, you should
not be excessively worried about encountering the coronavirus in the air on
your daily walk around the neighborhood.
Instead, your real concern
should be focused on surfaces. Say you get into an elevator. You should be more
careful about touching the buttons than about breathing potentially
contaminated air.
Respiratory droplets are
still believed to be the most common mode of coronavirus transmission. If the
virus was truly airborne, experts think we’d see way more cases of COVID-19,
the illness caused by the virus, than we already have.
Regardless, all of this is
why social distancing and lockdowns are so important. The farther away you are
from others, the less likely it is that you’ll come into contact with the virus
― whether it’s through direct exposure, touching a surface or aerosolized
particles. You never know who or what could be infected; research is finding
that more people don’t know they have the illness and are stealth transmitters
of the virus.
Also, continue to wash your
hands. Spend at least 20 seconds using warm water and soap (it doesn’t matter
what kind) and a clean towel or paper towel to dry them off. Take the time to
do it every time you come home, before eating, after using the bathroom and
whenever else you think it’s necessary.
It may feel like an
overreaction, but it isn’t. Taking this seriously is the only way we can slow
the spread and flatten the curve.
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