People over 1.8m may be 'twice as likely' to contract new coronavirus

  • A survey of 2 000 people showed those over 1.8m had a higher risk of contracting SARS-CoV-2.
  • The findings support the theory that the virus is spread through aerosol transmission.
  • This makes mask wearing even more critical than previously thought.

A new survey that gathered data from 2 000 people in the UK and US showed men taller than 6ft (1.8m) have double the risk of being diagnosed with SARS-CoV-2, the virus that causes Covid-19.

The research was carried out by data scientists in the UK, US and Norway, and was led by experts at the University of Oxford.

The findings don't suggest tall people are genetically more vulnerable to infection. Instead, the researchers point out that the virus could spread through aerosol transmission, which involves tiny bug-containing particles that remain suspended in the air after being exhaled.

The researchers, therefore, hypothesise that taller people are at a higher risk of being infected because they are exposed to more of these particles. The results were published in the preprint server, and have yet to be peer reviewed.

Aerosol transmission of SARS-CoV-2

As the virus has been confirmed to spread via respiratory droplets, aerosol transmission has been hotly debated by scientists over the past few months. Droplets are bigger than aerosols and travel relatively short distances, whereas aerosols can accumulate in poorly ventilated areas and are carried by air currents.

The World Health Organisation (WHO) recently updated its scientific brief and conceded that aerosol Covid-19 transmission "cannot be ruled out".

"Short-range aerosol transmission, particularly in specific indoor locations, such as crowded and inadequately ventilated spaces over a prolonged period of time with infected persons, cannot be ruled out," the WHO website states.

The organisation previously ruled out the possibility that aerosol transmission of the virus was likely to occur outside a hospital setting, but after a letter, published in the journal Clinical Infectious Diseases implored public health agencies to consider this mode of transmission, their guidance changed.

Data suggests a shift

Researchers of the recent study say their findings would not have been possible if downward droplet transmission was the only transmission mechanism of SARS-CoV-2.

Of the 2 000 people surveyed, 339 people were over 1.8m.

"The results of this survey in terms of associations between height and diagnosis suggest downward droplet transmission is not the only transmission mechanism, and aerosol transmission is possible," said co-author Professor Evan Kontopantelis from The University of Manchester in a news release

Kontopantelis added: "This has been suggested by other studies, but our method of confirmation is novel." 

We should all be wearing face masks

Current non-pharmaceutical interventions to curb the spread of the virus include physical distancing of one to two metres, but this is based on the assumption that the virus is only spread via respiratory droplets, by direct contact with infected persons, or by contact with contaminated objects and surfaces.

If SARS-CoV-2 does indeed spread via aerosols, this means wearing cloth face masks is even more important in controlling the rise of infections than previously believed.

Kontopantelis explained: "Though [physical] distancing is still important because transmission by droplets is still likely to occur, it does suggest that mask-wearing may be just as, if not more, effective in prevention."

In addition to mask wearing, Kontopantelis added that air purification in interior spaces should also be further explored.

We live in a world where facts and fiction get blurred
In times of uncertainty you need journalism you can trust. For 14 free days, you can have access to a world of in-depth analyses, investigative journalism, top opinions and a range of features. Journalism strengthens democracy. Invest in the future today. Thereafter you will be billed R75 per month. You can cancel anytime and if you cancel within 14 days you won't be billed. 
Subscribe to News24
Voting Booth
The ANC's leadership race is heating up. Who do you think will be elected party president at Nasrec in December?
Please select an option Oops! Something went wrong, please try again later.
Nkosazana Dlamini-Zuma has got it in the bag
6% - 207 votes
I foresee a second term for Cyril Ramaphosa
81% - 2672 votes
Don’t discount a Zweli Mkhize win
12% - 407 votes
Rand - Dollar
Rand - Pound
Rand - Euro
Rand - Aus dollar
Rand - Yen
Brent Crude
Top 40
All Share
Resource 10
Industrial 25
Financial 15
All JSE data delayed by at least 15 minutes Iress logo
Editorial feedback and complaints

Contact the public editor with feedback for our journalists, complaints, queries or suggestions about articles on News24.