A vial of some of the first 500,000 of the two million AstraZeneca COVID-19 vaccine doses that Canada has secured through a deal with the Serum Institute of India in partnership with Verity Pharma at a facility in Milton, Ont., on Wednesday, March 3, 2021. THE CANADIAN PRESS/Carlos Osorio - POOL

A vial of some of the first 500,000 of the two million AstraZeneca COVID-19 vaccine doses that Canada has secured through a deal with the Serum Institute of India in partnership with Verity Pharma at a facility in Milton, Ont., on Wednesday, March 3, 2021. THE CANADIAN PRESS/Carlos Osorio - POOL

Federal panel recommends 4-month gap between COVID vaccine doses due to limited supply

The recommendation applies to all COVID-19 vaccines currently approved in Canada

The National Advisory Committee on Immunization (NACI) is supporting B.C.’s decision to delay the second doses of COVID-19 vaccines by up to four months.

“NACI recommends that in the context of limited COVID-19 vaccine supply jurisdictions should maximize the number of individuals benefiting from the first dose of vaccine by extending the second dose of COVID-19 vaccine up to four months after the first,” the committee said in a decision published Wednesday (March 3).

The recommendation applies to all COVID-19 vaccines currently approved in Canada; Pfizer-BioNTech, Moderna and the newly approved AstroZeneca vaccine.

B.C. announced the decision to delay the second booster shot for four months on Monday, which health officials said could mean that all adults in the province could have their first dose by July.

READ MORE: Most B.C. adults could get their first COVID vaccine shot by July: health officials

Both provincial health officer Dr. Bonnie Henry and NACI said that its rationale was based on both the current available vaccine supply and data from other countries.

A study published by the University of Cambridge in the U.K., which has not yet been peer-reviewed, suggests that a single dose of the Pfizer-BioNTech vaccine can reduce the number of asymptomatic COVID-19 infections by 75 per cent.

In Israel, researchers studied the effects of a single dose of the same vaccine and published their findings in The Lancet medical journal, concluding that it was 85 per cent effective against symptomatic COVID-19 infections.

Also in The Lancet, a U.K. study found that the Oxford-AstraZeneca vaccine is 81 per cent effective when its second dose is given three months after the first, compared with 55 per cent efficacy after six weeks.

The national advisory committee noted that since the COVID-19 vaccines are still new, its unknown how long the protection of one or both doses lasts for.

“Experience with other multi-dose vaccines after a single dose suggests persistent protection could last for six months or longer in adolescents and adults,” NACI said in its statement. “Longer-term follow-up of clinical trial participants and those receiving vaccination in public programs will assist in determining the duration of protection following both one and two doses of vaccination.”

The national advisory committee added that it’s unknown how a delayed booster shot regime will affect the spread of variants of concern, including the U.K. and South African ones. However, NACI notes that there is “currently no evidence that an extended interval between doses will either increase or decrease the emergence of variants of concern.”

The committee noted that all three currently approved vaccines have shown “promising early result” against the U.K. variant B.1.1.7.

READ MORE: COVID-19 wage and rent subsidies, lockdown support to be extended until June

– with files from The Canadian Press


@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.

Coronavirusvaccines

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

Just Posted

In a feature article published April 10, 2021 in The Times of London, ‘headlined British Columbia has what it takes to rival Napa Valley,’ the valley is praised extensively for its natural beauty and wine. (File photo)
From the U.K. with love: Okanagan wine, scenery receives international praise

The Times of London newspaper recently featured the valley in a wine and travel piece

The currently vacant lot on Main Street where a Dairy Queen, retail and residential spaces have been approved to go into. (Town of Oliver)
Main Street in Oliver is getting a Dairy Queen and residential units

Oliver council gave its approval to fill the empty lot with DQ and residential units

A dumpster was on fire behind a residential complex in downtown Penticton Tuesday afternoon. (Brennan Phillips Western News)
Dumpster fire extinguished in downtown Penticton

There has been a string of dumpster fires lately

FILE — In this March 31, 2021 file photo, a nurse fills a syringe with a dose of the Johnson & Johnson’s one-dose COVID-19 vaccine at the Vaxmobile, at the Uniondale Hempstead Senior Center, in Uniondale, N.Y. The U.S. is recommending a “pause” in administration of the single-dose Johnson & Johnson COVID-19 vaccine to investigate reports of potentially dangerous blood clots. In a joint statement Tuesday, the Centers for Disease Control and Prevention and the Food and Drug Administration said it was investigating clots in six women in the days after vaccination, in combination with reduced platelet counts. (AP Photo/Mary Altaffer, File)
72 new COVID-19 cases in Interior Health

This brings the total number of cases in the region to 9,666 since the pandemic began

Fire rips through shop in small South Okanagan town

The building was destroyed despite community efforts to fight the fire

Restaurant patrons enjoy the weather on a patio in Vancouver, B.C., Monday, April 5, 2021. The province has restricted indoor dining at all restaurants in B.C. due to a spike in COVID-19 numbers. THE CANADIAN PRESS/Jonathan Hayward
B.C.’s COVID-19 indoor dining, drinking ban extending into May

Restaurant association says patio rules to be clarified

Skogie’s Express Tunnel Wash on Anderson Way in Vernon. (Submitted photo)
Lawsuit dismissed after vehicle damaged while inside Okanagan car wash

Civil Resolution Tribunal dismisses driver’s claim following a collision inside Skogie’s car wash in Vernon

The future of the Eagle Pass Lookout cabin is being discussed. (File photo)
Options presented for future of former Eagle Pass fire lookout in Shuswap

Stakeholders met in 2020 to discuss the restoration, or possible removal of the cabin

(Mayor Cindy Fortin - Peachland)
Peachland mayor declines early vaccination offer

Mayor Cindy Fortin said she wants seniors, immunocompromised individuals to get the shot first

B.C. Premier John Horgan speaks at the B.C. legislature. (B.C. government)
Tougher COVID-19 restrictions in B.C., including travel, still ‘on the table’: Horgan

John Horgan says travel restrictions will be discussed Wednesday by the provincial cabinet

Conservation officers caught three men over fishing bull trout in Kinbasket Lake. (Facebook)
B.C. men fined $1.7K for overfishing near Revelstoke, Golden

The seized fish were donated to the Golden Food Bank

NorKam secondary student Karis Wilson in the outfit that got her sent home from school on Feb. 23, 2021. (Kamloops This Week photo)
Clothing that ‘detracts from learning process’ removed from SD73 student dress code

Policy change underway after student in knee-length dress, long-sleeve turtleneck sent home

Protesters occupied a road leading to Fairy Creek Watershed near Port Renfrew. (Submitted photo)
B.C. First Nation says logging activist interference not welcome at Fairy Creek

Vancouver Island’s Pacheedaht concerned about increasing polarization over forestry activities

Flow Academy is not accepting membership applications from anybody who has received a dose of the vaccine, according to a password-protected membership application form. (Submitted image)
B.C. martial arts gym refusing patrons who have been vaccinated, wear masks

Interior Health has already issued a ticket to Flow Academy for non-compliance with public health orders

Most Read