Pfizer vaccine efficacy ‘decreases against Delta variant’
Data from Israel suggests jab is less effective at preventing infection with rapidly spreading strain of Covid
The effectiveness of the Pfizer-BioNTech vaccine in preventing Covid infection and symptomatic illness has dropped in Israel as the Delta variant spreads, according to a preliminary study.
The decline, reported by the country’s health ministry, has also coincided with the lifting of almost all coronavirus restrictions on 1 June, Israeli news site Ynet reports.
Data for the past month shows that the jab’s efficacy was 64% after two doses, down from 94% in May. But the vaccine was still 93% effective in preventing hospitalisations and serious illness - a relatively small drop from 98.2%.
Subscribe to The Week
Escape your echo chamber. Get the facts behind the news, plus analysis from multiple perspectives.
Sign up for The Week's Free Newsletters
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
Uptick in infection
“Israel has been one of the most successful countries in the world in tackling the pandemic,” says the BBC.
According to latest Oxford University tracking, 60% of Israel’s 9.3 million population have received both jabs, compared with about 50% in the UK.
After then prime minister Benjamin Netanyahu became the first person in Israel to receive a shot, on 19 December, the average number of daily confirmed Covid cases hit more than 8,000 in January but then declined to reach just double digits in May.
Sign up for Today's Best Articles in your inbox
A free daily email with the biggest news stories of the day – and the best features from TheWeek.com
However, “cases have ticked up since Israel lifted all remaining Covid-19 restrictions” at the start of June, reports the Financial Times. And experts are “blaming the highly transmissible Delta variant”, which was first detected in India.
A total of 324 new infections were reported in Israel yesterday, although the number of Covid-related deaths has remained very low.
The Delta variant is thought to be responsible for 90% of new cases recorded over the past two weeks in the country, which has used the Pfizer-BioNTech jab for “almost all vaccinated Israelis”, says The Times of Israel.
‘Preliminary signal’
Public Health England (PHE) has “also documented a drop in efficacy for the Pfizer jab against the Delta variant, though less severe”, says the FT.
A PHE study published in May found that the jab offered 88% protection against symptomatic infection from the Delta strain after two doses, compared with 93% against the Alpha variant (also known as the Kent variant).
In Israel, about half of adults infected during the ongoing Delta outbreak were fully inoculated with the Pfizer vaccine. The chair of Israel’s National Expert Panel on Covid-19, Ran Balicer, told the AFP news agency yesterday that the rise in new cases was a “preliminary signal” of “some decrease in vaccine effectiveness against mild illness - but not severe illness”.
But he stressed that it was “too early to precisely assess vaccine effectiveness against the variant”.
Responding to the new Israeli data, New York-based pharmaceutical giant Pfizer noted that the study was still preliminary and that existing evidence has shown that the jab works against a number of variants of concern, including Delta.
Contrast to UK
Israel’s reaction to the surge in Delta infections “stands in contrast with that of the UK”, says the FT. While Boris Johnson is pressing forward with a full lifting of Covid restrictions from 19 July, Israel is considering reintroducing the measures removed there last month.
Mandatory masks in public enclosed spaces have already been reinstated in a bid to stem the rise in cases, while doctors are calling for ministers to roll out vaccine booster shots.
And the Israeli government’s coronavirus cabinet is meeting today “to consider the reinstitution of restrictions” including social gathering limits, along with a return to the country’s “green passport” scheme for people who have been fully vaccinated, reports Ynet.
-
Why Man United finally lost patience with ten Hag
Talking Point After another loss United sacked ten Hag in hopes of success in the Champion's League
By The Week UK Published
-
Who are the markets backing in the US election?
Talking Point Speculators are piling in on the Trump trade. A Harris victory would come as a surprise
By The Week UK Published
-
Crossword: November 3, 2024
The Week's daily crossword
By The Week Staff Published
-
Long Covid: study shows damage to brain's 'control centre'
The Explainer Research could help scientists understand long-term effects of Covid-19 as well as conditions such as MS and dementia
By The Week UK Published
-
FDA OKs new Covid vaccine, available soon
Speed read The CDC recommends the new booster to combat the widely-circulating KP.2 strain
By Peter Weber, The Week US Published
-
Mpox: how dangerous is new health emergency?
Today's Big Question Spread of potentially deadly sub-variant more like early days of HIV than Covid, say scientists
By The Week UK Published
-
What is POTS and why is it more common now?
The explainer The condition affecting young women
By Devika Rao, The Week US Published
-
Brexit, Matt Hancock and black swans: five takeaways from Covid inquiry report
The Explainer UK was 'unprepared' for pandemic and government 'failed' citizens with flawed response, says damning report
By Harriet Marsden, The Week UK Published
-
The world is finally feeling less negative
Under The Radar Gallup's Global Emotions Report finds moods improving for first time in a decade, but are Ukrainians really less stressed than Brits?
By Chas Newkey-Burden, The Week UK Published
-
Should masks be here to stay?
Talking Points New York Governor Kathy Hochul proposed a mask ban. Here's why she wants one — and why it may not make sense.
By Anya Jaremko-Greenwold, The Week US Published
-
Covid might be to blame for an uptick in rare cancers
The explainer The virus may be making us more susceptible to certain cancers
By Devika Rao, The Week US Published