People wear face masks as they walk along a street in Montreal, Sunday, Oct. 18, 2020, as the COVID-19 pandemic continues in Canada and around the world. THE CANADIAN PRESS/Graham Hughes

People wear face masks as they walk along a street in Montreal, Sunday, Oct. 18, 2020, as the COVID-19 pandemic continues in Canada and around the world. THE CANADIAN PRESS/Graham Hughes

Canada updates COVID-19 guidelines to include airborne transmission, following U.S., WHO

New information was updated after top doctor recommended triple-layer masks

The Public Health Agency of Canada quietly updated its COVID-19 guidelines this week to include aerosol, or airborne, transmission of the virus.

The move came sometime late Tuesday (Nov. 3) or early Wednesday morning, within 24 hours of the country’s chief medical officer recommendation that masks should be triple-layered, including a filter.

READ MORE: Third layer’s the charm: Canada’s top doctor unveils new face mask recommendations

In a section within Canada’s COVID-19 online information hub titled “How COVID-19 spreads,” the modes of transmission have been updated.

“COVID-19 spreads from an infected person to others through respiratory droplets and aerosols created when an infected person coughs, sneezes, sings, shouts, or talks. The droplets vary in size from large droplets that fall to the ground rapidly (within seconds or minutes) near the infected person, to smaller droplets, sometimes called aerosols, which linger in the air under some circumstances,” the website reads.

The new statement does acknowledge that the “relative infectiousness of droplets of different sizes is not clear.”

The updated information cites outbreaks that occurred in settings with poor ventilation, with the agency said “suggest that infectious aerosols were suspended in the air and that people inhaled the virus.” Those settings include choir practice, fitness classes and restaurants.

“Transmission in these settings may have been facilitated by certain environmental conditions, such as re-circulated air,” the agency’s COVID-19 information reads.

“There is no evidence at this time that the virus is able to transmit over long distances through the air, for example, from room to room through air ducts. It is still unclear how easily the virus spreads through contact with surfaces or objects.”

The prior statements on COVID-19’s mode of transmission included only close contact, meaning “breathing in someone’s respiratory droplets after they cough, sneeze, laugh or sing,” as well as contaminated surfaces and common greetings such as hugs, handshakes and kisses.

Canada’s move came months after other public health agencies began to update their COVID-19 transmission guidelines.

In July, the World Health Organization (WHO) released data suggesting that airborne transmission can spread the novel coronavirus.

“Airborne transmission of the virus can occur in health care settings where specific medical procedures, called aerosol generating procedures, generate very small droplets called aerosols. Some outbreak reports related to indoor crowded spaces have suggested the possibility of aerosol transmission, combined with droplet transmission, for example, during choir practice, in restaurants or in fitness classes.”

In October, the U.S. Centre for Disease Control (US CDC) stated that “COVID-19 can sometimes be spread by airborne transmission,” citing situations where people more than six feet away from others still got infected with the virus.


@katslepian

katya.slepian@bpdigital.ca

Like us on Facebook and follow us on Twitter.

Want to support local journalism during the pandemic? Make a donation here.

Coronavirus

Just Posted

Mike Farnworth, pre-pandemic. (File photo)
Farnworth says SPS recruiting not distracting cops from investigating shootings

‘That’s simply not the case,’ Public Safety Minister Mike Farnworth told the Now-Leader on Friday

Little House Alcohol & Drug Addiction Recovery Society COO Debbi McKenzie stands in front of the society’s namesake facility with Phoenix Drug Alcohol Recovery and Education Society CEO Keir Macdonald. (Submitted photo)
Delta’s Little House Society merging with Surrey-based Phoenix Society

Merger ‘came together in a really organic way’ as societies have been working together for two years

Police and fire crews were in the 18500-block of 18 Avenue around 9 p.m. Thursday (May 13, 2021). (Curtis Kreklau photo)
PHOTOS: Police investigating South Surrey vehicle fire

Unclear if blaze in the 18500-block of 18 Avenue related to Burnaby shootings: RCMP

Surrey teacher Derek Duke gets vaccinated for COVID-19 at the North Surrey clinic on Wednesday, March 24. (submitted photo: Fraser Health)
COVID-19 cases among staff drop 60% after vaccinations: Surrey school district

School-based staff first eligible for vaccine March 24

Darlene Bennett, right, speaking about her murdered husband Paul at a press conference in 2018. (File photo: Tom Zytaruk)
Widow of Surrey murder victim seeking referendum vote on policing transition

Darlene Bennett files application with Elections BC seeking binding referendum vote

Prince Rupert was one of the first B.C. communities targeted for mass vaccination after a steep rise in infections. Grey area marks community-wide vaccine distribution. (B.C. Centre for Disease Control)
B.C. tracks big drop in COVID-19 infections after vaccination

Prince Rupert, Indigenous communities show improvement

A COVID-19 patient receives oxygen outside a hospital in Jammu, India, Wednesday, May 12, 2021. (AP/Channi Anand)
B.C. donates $500K to Red Cross COVID-19 relief efforts in India

The money will provide oxygen cylinders and ambulances for patients in communities grappling with the virus

Police are asking the public for help identifying a suspect who allegedly hurled anti-Asian slurs at a family in a Richmond drive-through on May 1. (Benjamin Wong/Screen grab)
Suspect at large in racist tirade at Richmond drive-thru, says RCMP

The Caucasian man was recorded May 1 yelling anti-Asian slurs at a Richmond family in the lineup

B.C. Public Safety Minister Mike Farnworth debates the province’s latest measure to control crime, March 10, 2021. The legislation allows police to impound vehicles used to transport weapons and further restricts sale of vehicle and body armour. (B.C. legislature video)
B.C. seeking ways to ‘name and shame’ gangsters, minister says

Mike Farnworth appeals to family members to talk to police

Jonathan Prest had to climb way up to the top of a dead red cedar tree to rescue a terrified cat, but he made it up and down successfully. (Facebook photos)
Tree cutter rescues cat stuck 100 feet up a dead and dried-out cedar

Jonathan Prest put himself in extreme peril to get a terrified cat out of a dangerous situation

The Greater Victoria School District continues to face backlash over its wording and approach to Indigenous learners in its 2021-2022 budget talks. (Black Press Media file photo)
School district’s approach to Indigenous learners leaves Victoria teachers ‘disgusted’

Backlash grows over ‘pattern of colonial thinking permeating the leadership’

Italian-Canadian prisoners at the Kananaskis prisoner of war camp in Alberta. (University of Calgary/Contributed)
Italian moved to Okanagan with hope; he ended up being sent to a WWII internment camp

Raymond Lenzi shares his grandfather’s story ahead of Canada’s planned formal apology to Italian-Canadians

Then-minister Rich Coleman, escorted by Victoria Police, makes his way to the east wing amid a protest blocking the legislature entrances before the throne speech in Victoria, B.C., Tuesday, Feb. 11, 2020. THE CANADIAN PRESS/Chad Hipolito
B.C. money laundering inquiry testimony ends today with reappearance of Rich Coleman

Responsible for the gaming file off and on from 2001 to 2013, Coleman been recalled after his initial testimony to the Cullen Commission last month

Colin Dowler rests in hospital recuperating from wounds suffered from a grizzly bear attack north of Campbell River. He was able to end the struggle by stabbing the bear in the neck with a knife like the one he is holding. Photo submitted
‘Bad-ass dude that took on a grizzly bear’ doesn’t let 2019 B.C. attack bring him down

Campbell River’s Colin Dowler gets on with his life as his rehabilitation continues

Most Read