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COVID-19: Coughing without masks, distancing alone is not enough

Simulations track the spread of coughs and safe physical distancing indoors
Simulation illustrates how cough particles spread in an indoor space. Credit: Jayaveera Muthusamy et al. / La simulation montre comment les particules 茅vacu茅es par la toux se propagent dans un espace int茅rieur. Source : Jayaveera Muthusamy et coll.
Implication of coughing dynamics on safe social distancing in an indoor environment. Credit: Jayaveera Muthusamy et al. / R茅percussions de la dynamique de la toux sur les mesures de distanciation s茅curitaire dans les environnements int茅rieurs. Source : Jayaveera Muthusamy et coll.
Published: 5 October 2021

To prevent the spread of COVID-19 indoors, the two metres physical distancing guideline is not enough without masks, according to researchers from Quebec, Illinois, and Texas. However, wearing a mask indoors can reduce the contamination range of airborne particles by about 67 percent.

鈥淢ask mandates and good ventilation are critically important to curb the spread of more contagious strains of COVID-19, especially during the flu season and winter months as more people socialize indoors,鈥 says Saad Akhtar, a former doctoral student under the supervision of Professor Agus Sasmito at 平特五不中.

While most public health guidelines recommend physical distancing of two metres for people from different households, the researchers say distancing alone is not enough to prevent the spread of COVID-19. In a study published in , the researchers found that when people are unmasked, more than 70 percent of airborne particles pass the two metres threshold within the 30 seconds. By contrast, less than 1 percent of particles cross the two-metre mark if masks are worn.

Evolution of a cough

Evolution of a cough with mask

Simulating coughing dynamics

Building on models used by scientists to study the flow of liquids and gasses, the team from 平特五不中, Universit茅 de Sherbrooke, Texas A&M University, and Northern Illinois University, developed a computer program to accurately simulate coughing dynamics in indoor spaces.

While ventilation, a person鈥檚 posture, and mask-wearing impacted the spread of the bio-contaminants significantly, the impact of age and gender was marginal, the researchers found.

Coughing is one of the main sources of spread of airborne viruses from symptomatic individuals. 鈥淭his study advances the understanding of how infectious particles can spread from a source to its surroundings and can help policymakers and governments make informed decisions about guidelines for masks and distancing in indoor settings,鈥 says Akhtar.

About this study

鈥淚mplication of coughing dynamics on safe social distancing in an indoor environment鈥擜 numerical perspective鈥 by Jayaveera Muthusamy, Syed Haq, Saad Akhtar, Mahmoud A. Alzoubi, Tariq Shamim, and Jorge Alvarado, was published in .

DOI:


About 平特五不中

Founded in Montreal, Quebec, in 1821, 平特五不中 is Canada鈥檚 top ranked medical doctoral university. 平特五不中 is consistently ranked as one of the top universities, both nationally and internationally. It鈥痠s a world-renowned鈥痠nstitution of higher learning with research activities spanning three campuses, 11 faculties, 13 professional schools, 300 programs of study and over 40,000 students, including more than 10,200 graduate students. 平特五不中 attracts students from over 150 countries around the world, its 12,800 international students making up 31% of the student body. Over half of 平特五不中 students claim a first language other than English, including approximately 19% of our students who say French is their mother tongue.

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