Pfizer claims 3rd dose 'strongly' boosts protection against Delta variant

A third dose of the Pfizer/BioNTech COVID-19 vaccine can "strongly" boost protection against the Delta variant -- beyond the protection afforded by the standard two doses, suggests new data released by Pfizer on Wednesday.

The data posted online, which are expected to be discussed in a company earnings call on Wednesday morning, suggest that antibody levels against the Delta variant in people ages 18 to 55 who receive a third dose of vaccine are greater than five-fold than following a second dose.

Among people ages 65 to 85, the Pfizer data suggest that antibody levels against the Delta variant after receiving a third dose of vaccine are greater than 11-fold than following a second dose.

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There's "estimated potential for up to 100-fold increase in Delta neutralization post-dose three compared to pre-dose three," researchers wrote in the Pfizer data slides.

The data have not yet been peer-reviewed or published.

The data also show that antibody levels are much higher after a third dose than a second dose against the original coronavirus variant and the Beta variant, first identified in South Africa.

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Canada

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McGill University says pro-Palestinian demonstrators 'refuse' to collaborate, encampment violates policies

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Toronto transit workers vote 'overwhelmingly' in support of strike mandate

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World

Columbia University threatens to suspend pro-Palestinian protesters after talks fail

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NATO chief chides members as Ukraine's allies say slow arms deliveries have helped Russia

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'Great enigma': Amateur archaeologists unearth mysterious Roman object

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A devastating tornado tore through a Nebraska town the day before this couple's wedding. They celebrated in the dark anyway

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Politics

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Global measles cases nearly doubled in one year, researchers say

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Sci-Tech

Northern Ont. beekeeper advising others to have colonies tested for chemicals

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Cybersecurity expert weighs in on the possibility of a U.S. ban of TikTok

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Cisco reveals security breach, warns of state-sponsored spy campaign

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Entertainment

Anne Hathaway reveals she's now five years sober

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Billie Eilish announces 'Hit Me Hard and Soft' arena world tour

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Business

Philips will pay US$1.1 billion to resolve U.S. lawsuits over breathing machines that expel debris

Medical device maker Philips said Monday it will pay US$1.1 billion to settle hundreds of personal injury lawsuits in the U.S. over its defective sleep apnea machines, which have been subject to a massive global recall.
Majority of aspiring homeowners awaiting rate cuts before buying: BMO survey

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'Deeply unhappy' grocery shoppers plan to boycott Loblaw-owned stores in May

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Lifestyle

Historic church in Vancouver for sale for $10M

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Gold watch worn by richest passenger aboard Titanic sells for record-breaking US$1.5 million

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Canada's oldest hat store still going strong after 90 years

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Sports

Montreal's Felix Auger-Aliassime through to Madrid fourth round after Mensik retires

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Mike Tyson details regime of abstinence as bout with Jake Paul is sanctioned as professional fight

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Autos

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'I was scared': Ontario man's car repossessed after missing two repair loan payments

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Toronto

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Calgary

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Ottawa

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Montreal

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Edmonton

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Atlantic

Third youth charged with second-degree murder in death of 16-year-old: Halifax police

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Bedford man charged with stunting after vehicle clocked at 248 km/h: N.S. RCMP

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Police investigating alleged threats at 2 Halifax high schools

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Winnipeg

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A timeline of the Jeremy Skibicki case

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Jets forward Namestnikov hospitalized after taking puck to side of the head

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Regina

USask study highlights more concerns with proposed Bunge-Viterra merger

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Kindersley, Sask. man facing drunk driving charges after fatal crash with cyclist

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Saskatchewan highlights preparations made ahead of wildfire season

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Kitchener

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Saskatoon

Kindersley, Sask. man facing drunk driving charges after fatal crash with cyclist

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New funding aims to get more First Nation people working in Sask. energy, mining sectors

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Northern Ontario

Human skeletal remains found in Chelmsford area of Greater Sudbury, police say

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'Deeply unhappy' grocery shoppers plan to boycott Loblaw-owned stores in May

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One taken to hospital after car flips over in Sudbury

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London

Arson charge laid after fire set outside downtown London, Ont. residence

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London man charged with sexual assault following alleged downtown incident

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'I'm grateful for every new day': $20-million donation transforms LHSC cancer care

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Barrie

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Barrie police seek alleged car-bombing suspect

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Sentencing hearing adjourned for teen murderer

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Windsor

Motorcycle driver dead after crash with car on Dougall Avenue

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Sentencing delayed for Windsor denturist convicted of sex offences

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Two weekend fires under investigation

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Vancouver Island

London Drugs stores remain closed Monday after 'cybersecurity incident'

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Historic church in Vancouver for sale for $10M

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Kelowna

B.C. breweries take home awards at World Beer Cup

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B.C. man rescues starving dachshund trapped in carrier: BC SPCA

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Search crews called in after missing Kelowna senior's truck found

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Lethbridge

RCMP in Coaldale, Alta., area conduct check stops, pull over more than 200 vehicles

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Bandits get hat trick from Logan Sawyer en route to 8-2 win over Okotoks

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Sault Ste. Marie

Northern Ont. volunteer firefighters compete in challenge

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Sault impaired driving suspect left gas nozzle in vehicle, drove away

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Freezing rain warning for parts of northern Ontario

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N.L.

'I feel honoured to say I was his friend': Wayne Gretzky remembers Bob Cole

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Voice of 'Hockey Night in Canada' Bob Cole never considered moving out of St. John's

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Cenovus fined $2.5 million for biggest oil spill in Newfoundland and Labrador history

Cenovus Energy has been ordered to pay a $2.5-million fine for its role in the largest offshore oil spill ever recorded in Newfoundland and Labrador.

Pfizer claims 3rd dose 'strongly' boosts protection against Delta variant

CTVNews.ca Top Stories

WATCH | So you haven't filed your taxes yet…

WEATHER | Wet, cold and snowy start to the week prompts weather warnings/statements

WATCH So you haven't filed your taxes yet…

WEATHER Wet, cold and snowy start to the week prompts weather warnings/statements