Is the New Coronavirus Airborne? Here’s What Scientists Are Saying

As the world continues to deal with the coronavirus pandemic, one question that keeps coming up is whether COVID-19 can be transmitted through the air.

Recently, 239 scientists in 32 countries have written an open letter to the World Health Organisation (WHO) arguing there is mounting evidence the airborne route is a possibility in the transmission of COVID-19.

Similar to a lot of issues to do with the pandemic, what seems to be a relatively straightforward question is deceptively complex. The answer is still not known for sure.

Why do we need to understand the modes of transmission?

Understanding how coronavirus is transmitted from one person to the next enables us to design effective public health interventions to minimise the risk of transmission.

The reason why we’re advised to maintain 1.5 metres of distance from others because there’s consensus one of the main ways the virus spreads is via large droplets.

The size of the “large” droplets are usually greater than 5 micrometres and are propelled from an infected person’s nose or mouth in their mucus and saliva when they sneeze, cough or talk.

Thanks to gravity, these large droplets don’t generally travel far before landing. If you position yourself more than 1.5 metres from someone who might be infected, the possibility is you’ll be clear of the droplets’ path.

Similarly, understanding these large droplets can land on surfaces and that the virus can survive on these surfaces means we know we need to wash our hands and not touch our face to avoid transferring the virus to our mouth, nose or eyes.

Until now, the WHO has mentioned these large droplets are the major source of COVID-19 transmission. But the authors of the open letter suggest they are suspecting airborne transmission.

Why COVID-19 could be relation between an airborne transmission?

In its simplest interpretation, airborne transmission refers to the ability of a virus to be spread by droplets small enough to be suspended in the air. These droplets are less than 5 micrometres in size and are generally referred to as aerosols.

Whereas large droplets can only travel short distances, these smaller droplets, in theory, can be spread further, or can linger in a room even after an infected person has left.

Evidence supporting the notion that transmission of COVID-19 can occur via the airborne route takes several forms:

First, laboratory studies have demonstrated that SARS-CoV-2, the coronavirus that causes COVID-19, can be aerosolised, and can survive for up to four hours in this form.

Second, genetic material from SARS-CoV-2 has been detected in aerosols sampled at hospitals, including two hospitals in Wuhan, China from which the pandemic emerged. But it’s important to note the presence of this genetic material doesn’t necessarily mean the virus is infectious in this form.

Perhaps the strongest evidence, however, comes through the various case reports of super-spreading events. These have been instances in which many people appear to have been infected with coronavirus in the absence of close contact.

One notable early example was from a choir practice in the United States where almost 50 people were infected while two died even though they maintained physical distance.

Another instance is an outbreak in Guangzhou, China, where ten people from three families contracted COVID-19 after dining in a restaurant. Non-infected people were not in close contact with any infected person, but those who became infected were in the direct line of one air conditioning unit. 

The study of this pandemic is not yet peer-reviewed but is part of the evidence the authors of the open letter draw on.

What are the implications of airborne transmission?

Airborne transmission of this novel coronavirus is potentially a worry, because if it occurs often, it means the virus may be commonly transmitted in the absence of close contact. It also raises the possibility the virus may travel on air currents, and even be transmitted through air conditioning unit. This means social distancing may not always be an effective way, and in particular, crowded indoor areas with poor ventilation pose a major threat.

So where does this leave us?

The key question is not whether airborne transmission is theoretically possible; it certainly is. But rather, how significant is its role in the transmission of COVID-19 is?

If, for example, most transmission of SARS-CoV-2 happens via large droplets and the airborne route plays a role only occasionally, this has very different implications to a scenario where the airborne route is a significant mode of transmission.

Reassuringly, the precautions that have been implemented to limit spread of the virus, such as social distancing, have been largely successful so far in most of Australia. This suggests even if the virus can be spread by the airborne route, it’s not likely to be a major route of transmission.

Over to you

Given what we know, the dilemma is whether to employ the precautionary principle and assume the airborne route plays a vital role in disease transmission — and adjust infection control measures accordingly. This may take the form of encouraging wider use of masks and looking at increasing ventilation in enclosed spaces.

The other approach is to wait for more definitive evidence before changing the public health advice. We will await with interest the WHO’s response to the open letter. Till then, we encourage to keep practicing social distancing, use a mask and hand wash for at least 20 seconds.