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

Justin Bond’s Bahrain 1 took a team around a year to construct. It gets its name because the Sheik of Bahrain is a major sponsor of the team. / Photo courtesy of Justin Bond.
Mission dragracer wins Atlanta race, ousts back-to-back world champion

Justin Bond goes quarter-mile in 5.738-seconds, beating champ Stevie ‘Fast’ Jackson on home turf

Former UFV Cascades wrestling coach Arjan Singh Bhullar is now the ONE heavyweight champion after defeating Brandon Vera via TKO in round two on Saturday in Singapore. (ONE Championship)
Former UFV wrestling coach wins MMA championship

Arjan Singh Bhullar captures ONE heavyweight title, first Indian origin fighter to achieve honour

Jamie and Erin O’Neill, who are renting a 107-year-old house at 45837 Knight Rd., are wanting to save it from the wrecking ball and move it when it comes time for the owners of the house to build a new house on the property. They are pictured here outside the home on Tuesday, May 11, 2021. (Jenna Hauck/ Chilliwack Progress)
Chilliwack couple wants to save 107-year-old home from demolition, asking for community support

O’Neills have less than year to find new property, raise funds to move Knight Road house

Archway Community Services is among local agencies receiving one-time grants through the Civil Forfeiture Crime Prevention and Remediation grant program. (Photo courtesy of Archway)
Nine Abbotsford projects receive $345K in civil forfeiture grants

Funds awarded to projects aimed at prevention of crime and domestic violence

Karl Eha showing off a fishing rod that was originally made in 1972. Patrick Penner photo.
Mission’s Eha Sports offering store credit for old fishing gear, plans to donate to poor Latin American children

Karl Eha recalls time as hungry kid in post-war Germany, says fishing kept him full

Daily confirmed COVID-19 cases reported to B.C. public health, seven-day rolling average in white, to May 12, 2021. (B.C. Centre for Disease Control)
B.C. preparing ‘Restart 2.0’ from COVID-19 as June approaches

Daily infections fall below 500 Friday, down to 387 in hospital

The Independent Investigations Office of BC (IIO) (File Photo)
Police watchdog investigating after man found dead in Surrey following a wellness check

IIO says officers ‘reportedly spoke to a man at the home before departing’

On Friday, May 14 at Meadow Gardens Golf Club in Pitt Meadows, Michael Caan joined a very elite club of golfers who have shot under 60 (Instagram)
Crowds at English Bay were blasted with a large beam of light from an RCMP Air-1 helicopter on Friday, May 14. THE CANADIAN PRESS/Marc Grandmaison
Police enlist RCMP helicopter to disperse thousands crowded on Vancouver beach

On Friday night, police were witness to ‘several thousand people staying well into the evening’

People shop in Chinatown in Vancouver on Friday, February 5, 2021. THE CANADIAN PRESS/Jonathan Hayward
Vancouver community leaders call for action following 717% rise in anti-Asian hate crimes

‘The alarming rise of anti-Asian hate in Canada and south of the border shows Asians have not been fully accepted in North America,’ says Carol Lee

Sinikka Gay Elliott was reported missing on Salt Spring Island on Wednesday, May 12. (Courtesty Salt Spring RCMP)
Body of UBC professor found on Salt Spring Island, no foul play suspected

Sinikka Elliott taught sociology at the university

The first Black judge named to the BC Supreme Court, Selwyn Romilly, was handcuffed at 9:15 a.m. May 14 while walking along the seawall. (YouTube/Screen grab)
Police apologize after wrongly arresting B.C.’s first Black Supreme Court Justice

At 81 years old, the retired judge was handcuffed in public while out for a walk Friday morning

Surrey RCMP in the 4900-block of 148th Street, a short road just off of King George Boulevard, on May 15, 2021 after a male was allegedly assaulted with a “pipe-like” weapon that morning. (Photo: Shane MacKichan)
Surrey RCMP investigating after person reportedly injured with ‘pipe-like’ weapon

Police investigating incident in the 4900-block of 148th Street

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

Most Read