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

Get local stories you won't find anywhere else right to your inbox.
Sign up here

Just Posted

A fire Sunday, Nov. 22, 2020 about 5 p.m. at the Canoe Forest Products plywood plant was extinguished quickly. (File photo)
Fire at Canoe Forest Products plywood plant quickly extinguished

Fire started in veneer dryer during afternoon of Sunday, Nov. 22

RCMP Cpl. Cory Lepine pictured at BC Livestock Producers Co. in Kamloops, Nov. 16. (Phil McLachlan - Black Press Media)
Meet B.C.’s only cowboy cop; a voice for the livestock industry

Cpl. Cory Lepine serves as a bridge between the law and those who make a living off the land

Métis carver and elder John Sayer works at the Storefront School in Salmon Arm on Thursday, Nov. 19, helping students learn to carve and sharing his culture, while, in background, student William Dicer hones his carving skills. The masks pictured will be placed on trees in Little Mountain Park as part of a student project. (Martha Wickett - Salmon Arm Observer)
Video: New faces to emerge from the forest in Salmon Arm’s Little Mountain Park

Students at Storefront School join Métis elder in project that will add small carvings to trees

Revelstoke Mountain Resort was voted Best Ski Resort in Canada in the 2020 World Ski Awards. (Liam Harrap/Revelstoke Review)
Revelstoke Mountain Resort voted best in Canada

The World Ski Awards announced the 2020 winners

Kyle Charles poses for a photo in Edmonton on Friday, Nov. 20, 2020. Marvel Entertainment, the biggest comic book publisher in the world, hired the 34-year-old First Nations illustrator as one of the artists involved in Marvel Voice: Indigenous Voices #1 in August. THE CANADIAN PRESS/Jason Franson
VIDEO: Indigenous illustrator of new Marvel comic hopes Aboriginal women feel inspired

Kyle Charles says Indigenous women around the world have reached out

Join Black Press Media and Do Some Good
Join Black Press Media and Do Some Good

Pay it Forward program supports local businesses in their community giving

Minister of Justice and Attorney General of Canada David Lametti speaks with the media following party caucus in Ottawa, Tuesday, January 28, 2020. THE CANADIAN PRESS/Adrian Wyld
Exclusion of mental health as grounds for assisted death is likely temporary: Lametti

Senators also suggested the exclusion renders the bill unconstitutional

Claudio Mastronardi, Toronto branch manager at Carmichael Engineering, is photographed at the company’s offices in Mississauga, Ont., Thursday, Nov. 19, 2020. As indoor air quality becomes a major concern in places of business, HVAC companies are struggling to keep up with demand for high quality filtration systems. THE CANADIAN PRESS/Chris Young
Business is booming for HVAC companies as commercial buildings see pandemic upgrades

‘The demand right now is very high. People are putting their health and safety ahead of cost’

Bank of Montreal, located on Burrard Street in downtown Vancouver. (Google Maps)
Heiltsuk man files human rights complaint against Vancouver police, BMO after bank arrest

Pair remains distraught after employee falsely reports fraud in progress leading to their arrest

LeAnne Jakubeit, a prominent Penticton business woman and wife of former Penticton mayor Andrew Jakubeit, has died after a battle with cancer. Her death was announced Saturday, Nov. 21, 2020 on The Grooveyard’s Facebook page. (The Grooveyard / Facebook)
Prominent Penticton businesswoman dies after battle with cancer

LeAnne Jakubeit opened iconic Penticton record store The Grooveyard 30 years ago

(Phil McLachlan - Capital News)
Device found on Walmart parking lot confirmed false: Kelowna RCMP

Banks Road around Walmart was closed off on Nov. 22

BCHL
BCHL pushes back season start due to provincial health orders

The delay is minimal, just six days, for now. But the league is open to starting up after Christmas

Prime Minister Justin Trudeau speak to the media about the COVID-19 virus outside Rideau Cottage in Ottawa, Friday, Nov. 20, 2020. THE CANADIAN PRESS/Adrian Wyld
Long-awaited federal rent subsidy program for businesses hurt by COVID-19 opens today

The new program will cover up to 65 per cent of rent or commercial mortgage interest

Most Read