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

Anita Huberman, CEO Surrey Board of Trade. (File photo: Tom Zytaruk)
Surrey Board of Trade calls for ‘immediate’ government help for businesses shut down

‘Don’t punish all businesses for the sins of a few,’ CEO Anita Huberman says

The 3D Digital Breast Tomosynthesis Mammography machine, new to the Surrey Breast Health Clinic at the Jim Pattison Outpatient Care and Surgery Centre. (submitted photo)
New 3D breast-cancer technology in Surrey ‘has already helped so many women’

Digital breast tomosynthesis new to Surrey Breast Health Clinic

Helen Watson, posing for a photo for her 100th birthday, turned 105 on Saturday (Nov. 21). (File photo)
South Surrey Spanish Flu survivor marks 105 years

Helen Watson has packed a lot into life – including being in two pandemics

Provincial health officer Dr. Bonnie Henry updates B.C.’s COVID-19 situation at the B.C. legislature, Nov. 23, 2020. (B.C. government)
B.C. daily COVID-19 cases hits record 941 on Tuesday

Further restrictions on indoor exercise take effect

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
Canada’s inability to manufacture vaccines in-house will delay distribution: Trudeau

First doses of COVID-19 vaccine expected in first few months of 2021, prime minister says

Beaver Creek RCMP Cpl. Robert Drapeau, left to right, Gary Bath, Lynn Marchessault, Payton Marchessault, Rebecca Marchessault and Tim Marchessault pose in this recent handout photo near the Canada-U.S. border crossing near Beaver Creek, Yukon. A family reunion trip for the woman from Georgia that left them stranded ended on a bright note when Bath drove them to the Alaskan border following an appeal for help. THE CANADIAN PRESS/HO, Gary Bath *MANDATORY CREDIT*
Help from B.C. man allows American family to reunite in Alaska

Lynn Marchessault drove from Georgia to the Alaska border to join her husband, who serves in U.S. military

Cannabis bought in British Columbia (Ashley Wadhwani/Black Press Media)
Is it time to start thinking about greener ways to package cannabis?

Packaging suppliers are still figuring eco-friendly and affordable packaging options that fit the mandates of Cannabis Regulations

There are 32 active outbreaks in seniors' homes in the Fraser Health region.
MAP: See the locations of 32 active COVID-19 outbreaks in Fraser Health seniors’ homes

There are 32 active outbreaks in assisted-living, long-term care homes and seniors’ rental buildings

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

(Pixabay.com)
Man, 28, warned by Kootenay police to stop asking people to marry him

A woman initially reported the incident to police before they discovered others had been popped the question

Winston Blackmore (left) and James Oler (right) were sentenced on separate charges of polygamy this week in Cranbrook Supreme Court.
No more charges expected in Bountiful investigation, special prosecutor says

Special prosecutor says mandate has ended following review of evidence from Bountiful investigations

(Ashley Wadhwani/Black Press Media)
Refuse to follow B.C.’s mask mandate? Face a $230 fine

Masks are now required to be worn by all British Columbians, 12 years and older

Most Read