Months after the SARS-CoV-2 coronavirus first entered our global conversations, countries around the world have begun to announce their plans to slowly but surely return to “normal”, lifting shelter-in-place orders.
How does the COVID-19 coronavirus spread?
There are three main ways that the COVID-19 coronavirus can spread from person to person. Avoiding exposure to these methods of transmission are your best weapon against the coronavirus.
From close contact
Since the coronavirus is spread through mucous membranes, which are the thin mucus-producing layers that line your airways, it is important to avoid close contact. This is how most infections occur.1,2
What you can do:
- Keep 2 meters apart from the next person in case they sneeze or cough.
- Do not share utensils, cups, dishes, pens, etc.
- Do not touch people. This includes handshakes, hugs, and other common forms of physical contact.
- Keep meetings small with enough space to be two meters apart or join with video conferencing
From contaminated surfaces
Coronavirus RNA (the basic building blocks that make up the virus) can get on almost any surface – plastic, wood, metal, clothes, and so on.3
When an infected person sneezes or coughs, they can infect surfaces with their mucous droplets. When you touch a contaminated surface, it gets on your hands (or other body part). And when you touch your face with this hand, you can infect yourself.
What you can do:
- Do not touch your face. Try wearing a mask so that you’re more aware when you touch your face, which can help you remember to minimize the contact your hands make with your face.
- Wash or sanitise your hands often. This is because although most people don’t intend to touch their face, they inevitably do. By washing and sanitizing your hands often, it reduces the risk of infection in case you do accidentally touch your face.
- Cover your coughs and sneezes to prevent spreading your own mucous. Wearing a homemade cloth facemask prevents you from spreading your mucous. Do not purchase N95 masks, as there is currently limited inventory and these masks are desperately needed by health workers.
- Change your clothes and remove your shoes when you get home. After you’ve finished changing or removing your shoes, immediately wash your hands or sanitise them. This gives you a fresh, germ-free start at home.
From contaminated air
When an infected person coughs or sneezes, not all of the mucous membrane that’s released lands on surfaces – there is a portion of that mucous that remains airborne.4,5
If the air is left unfiltered after dozens of coughs or sneezes over the course of several hours, the airborne concentration of the virus can become very high.
In fact, in hospital settings or in the homes of people who are infected, the airborne concentration may become so high that simply breathing in an environment adjacent to an infected person could be linked to infections without proper infection control measures (although not all experts agree on this).6,7
This is why health workers, medical professionals, and first responders need special safety equipment, such as N95 masks.
It’s important to note that without the presence of infected persons constantly coughing or sneezing, airborne coronavirus transmission is highly unlikely.
What you can do:
- Keep 2 meters apart from the next person so that you are out of harm’s way in case they sneeze or cough.
- Do not purchase N95 masks during times like these when inventory is low. When you refrain from purchasing such items, it helps enable medical workers, professionals, and first responders to have the necessary equipment they need to be safe.
- Avoid stagnant air. Keep your HVAC running on fan "ON" setting—not "AUTO"—to ensure that the air is always moving. If there is no HVAC in your office, keep windows open as often as possible. This helps ensure that airborne viruses are diluted to non-critical levels.
There’s growing evidence that the number of new COVID-19 cases may be starting to drop as strict stay-at-home and shelter-in-place orders have effectively “flattened the curve” of infection.
But even as governments and businesses lift restrictions, the danger of the coronavirus is still real. Make sure you and those around you are consistently taking the proper measures to protect yourselves.
IQAir is a Swiss-based air quality technology company that since 1963 empowers individuals, organizations and communities to breathe cleaner air through information, collaboration and technology solutions.
 Peiris JS, et al. (2003). The severe acute respiratory syndrome. DOI: 10.1056/NEJMra032498
 Lu C, et al. (2020). 2019-nCoV transmission through the ocular surface must not be ignored. DOI: 10.1016/S0140-6736(20)30313-5
 Chin AWH, et al. (2020). Stability of SARS-CoV-2 in different environmental conditions. DOI: 10.1016/S2666-5247(20)30003-3
 Xie X, et al. (2007). How far droplets can move in indoor environments--revisiting the Wells evaporation-falling curve. DOI: 10.1111/j.1600-0668.2007.00469.x
 Van Doremalen N, et al. (2020). Aerosol and surface stability of SARS-CoV-2 as compared with SARS-CoV-1. DOI: 10.1056/NEJMc2004973
 Santarpia JL, et al. (2020). Transmission potential of SARS-CoV-2 in viral shedding observed at the University of Nebraska Medical Center. DOI: 10.1101/2020.03.23.20039446
 Cheng VCC, et al. (2020). Escalating infection control response to the rapidly evolving epidemiology of the coronavirus disease (COVID-19) due to SARS-CoV-2 in Hong Kong. DOI: 10.1017/ice.2020.58