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

Damien Smith, with father Thomas Smith, is “frozen” with joy as he watches a special message Deadpool star Ryan Reynolds recorded for Damien’s 9th birthday on Tuesday, Nov. 24, 2020. (Contributed)
Shuswap boy celebrates 9th birthday with family, community and Ryan Reynolds

People from around the world send birthday cards showing young Canoe resident he’s not alone

Construction of the proposed Ross Street underpass may start in the spring of 2021. (City of Salmon Arm illustration)
Salmon Arm’s Ross Street underpass to go to tender but not without risk

City council gives nod to construction agreement after pondering insurance

Masks are now officially mandatory in all City of Campbell River facilities. (Black Press File Photo)
Interior Health reports 49 new COVID-19 cases overnight

302 cases remain active; two in hospital

A School District 83 trustee expressed concern regarding how employee and trustee expenses are reported during a review of the statement of financial information for the district's fiscal year end. (File photo)
Transparency concern raised over North Okanagan-Shuswap school district expenses

Employee and trustee expenses total more than $370,000 for fiscal year

Shuswap Theatre is seeking outdoor venues for its planned Dec. 18-20 performances of Once Upon a Time in the Shuswap. (File photo)
Shuswap Theatre focused on outdoor travelling Christmas show

Salmon Arm-based theatre troupe in search of possible outdoor venues

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

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

(Phil McLachlan - Capital News)
Garage in Kelowna burns to the ground, blaze deemed suspicious

Fire crews responded to the scene just after 4:30 p.m.

(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

(Ty Hainsworth / Facebook)
No injuries after fire rips through South Okanagan fruit stand

A fruit stand caught fire Tuesday afternoon, closing Highway 97 for two hours

A major reconstruction project on 32nd Avenue is nearing completion and the road is now re-opened to traffic between 33rd Street and 35th Street. (City of Vernon photo)
ROAD REPORT: More roundabouts coming to North Okanagan

New intersection lights up Dec. 13, 30th Street paving delayed, PV Road completed in Vernon

In this handout photo provided by the Philippine Red Cross, families stay at a temporary evacuation center at Catanduanes province, eastern Philippines, Sunday, Nov. 1, 2020, as Typhoon Goni hits the country. Families living near coastal towns have moved to evacuation centers as the strong typhoon makes landfall. (Philippine Red Cross via AP)
Okanagan community group organizes fundraiser for typhoon-hit Philippines

Over two million people have been affected by flooding, with about 500,000 forced to leave homes

Most Read