People who become infected with the Delta variant even after being fully vaccinated may still pass the virus on, undermining hopes of herd immunity, new research suggests.
Scientists at the University of Oxford found levels of the virus could be just as high in people who get COVID despite having both jabs as in those who haven’t been vaccinated.
Dr Koen Pouwels, one of the lead researchers of the study, said: “The vaccines are better at preventing severe disease and are less effective at preventing transmission.
“The fact that you see more viral load (with the Delta variant) hints towards herd immunity being more challenging.”
Scientists from the COVID-19 Infection Survey have conducted regular PCR tests on more than 700,000 randomly selected people since December last year.
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Until mid-May, when the Alpha variant was the dominant form of the virus, the vaccines were highly effective at stopping infections.
But since then, a period when the more infectious Delta variant has dominated, the vaccines have been less able to block the virus.
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Professor Sarah Walker, Chief Investigator for the Survey, said: “We don’t yet know how much transmission can happen from people who get COVID-19 after being vaccinated – for example, they may have high levels of virus for shorter periods of time.
“But the fact that they can have high levels of virus suggests that people who aren’t yet vaccinated may not be as protected from the Delta variant as we hoped.”
The researchers stress that real-world data shows that the vaccines are still highly effective at reducing hospital admission and death.
Because volunteers in the study had regular PCR swabs and antibody tests the scientists were able to monitor immunity over time.
They found that two weeks after the second dose the Pfizer jab was 85% effective at preventing PCR-confirmed infection, considerably better than the AstraZeneca shot, which was 68% effective.
But the protection of the Pfizer jab waned more rapidly. Three months after the second dose it prevented 75% of infections, compared to 61% protection with the AstraZeneca jab.
“These two vaccines look like they are working in very different ways,” said Professor Walker.
“But it’s the rates of hospitalisations and deaths that we really need to keep our eye on.”
The study has been published as a pre-print and has not been peer-reviewed.
Dr Alexander Edwards, Associate Professor in Biomedical Technology at the University of Reading, said the results were “compelling”.
“Overall this study is excellent as it shows that although Delta is better at infecting vaccinated people than previous variants, the vaccines still work remarkably well.
“There are subtle differences between different vaccine types, and some changes over time, but they all work brilliantly.
“It does remain vital to remember that even if double jabbed, you can still get infected and pass the virus on.”
Prof Paul Hunter, Professor in Medicine at the University of East Anglia, said: “There is now quite a lot of evidence that all vaccines are much better at reducing the risk of severe disease than they are at reducing the risk from infection.
“The main value of immunisation is in reducing the risk of severe disease and death and the evidence available shows that protection lasts longer against severe disease than against mild disease and all current UK vaccines are very good at this even against the Delta variant.”
A judo Olympian has said her family is “devastated” after the discovery of body in the search for her missing brother.
Lubjana Piovesana, 28, appealed for help to find her younger sibling, Luis, 26, on Saturday. He had not been seen since the early hours of Friday morning.
A body was found in the River Frome near Napier Road in Eastville, Bristol, at around 6pm today, Avon and Somerset Police said.
Formal identification is yet to take place, the force added.
In a post on Instagram, Ms Piovesana wrote: “Hello everyone, Luis has been found.
“We are completely devastated but he has passed away.
“I am grateful for everyone’s support. And I am so sorry this happened.
“Luis was my little brother and loved by everyone. I wish he could have seen the love from everyone. He will be remembered by us all.”
The post was signed off with a dove emoji.
Image: Luis Piovesana did not have any money or his mobile phone with him when he went missing, police said. Pics: Avon & Somerset Police
Mr Piovesana was last seen at around 3am on Friday at the Eastgate retail park, which is less than a 10-minute walk away from where the body was found.
He had travelled there by taxi from a venue in Little Ann Street, St Jude’s, a 10-minute drive away.
The 26-year-old’s family spent the weekend searching for him, and asked people to check their sheds and gardens.
His partner, Laurin Bohler, said loved ones had travelled from Birmingham to help.
Mounted officers and police drones were also involved in the investigation.
Ms Piovesana competed for Team GB before switching to the Austrian team, and defeated British competitor Lucy Renshall in the women’s -63kg judo event at the Paris Olympics last year.
A man has been jailed for life for murdering his son’s girlfriend after she returned home from the school run.
Officers from Dyfed-Powys Police were called to an address on Bigyn Road in Llanelli, Carmarthenshire, on 5 July last year.
Sophie Evans, 30, had sustained 72 separate injuries on the outside of the body, “all but three of them new injuries”.
Richard Jones, who is now 50, believed he was “being taken advantage of financially” by Ms Evans and his son, with whom she was in a relationship.
While the purpose of Jones’s visit was “purely normal”, he confronted her on that morning about his suspicions and Ms Evans’s reaction was such that Jones “lost [his] temper”.
He subjected Ms Evans to “gross violence” before ultimately strangling her and leaving the property to run errands, including ordering a new bank card and buying pastries from a bakery.
Image: Richard Jones. Pic: Dyfed-Powys Police
‘Last time on their school run’
During sentencing on Monday, the defendant kept his head bowed for most of the hearing.
He will have to serve at least 20 years behind bars before he can be considered for release by the parole board.
Swansea Crown Court heard Ms Evans was the mother of two young children.
Passing his sentence, Judge Geraint Walters said Ms Evans “had just taken her two children for the last time on their school run” prior to the attack.
“She wasn’t to know that when she parted company with them that morning,” he added.
The court heard the Jones believed he was being defrauded by Ms Evans and his son.
“There is clear evidence, that in the days leading up to this, that you had begun harbouring thoughts that Sophie Evans and your own son were in fact financially scamming you,” he said.
“What precisely brought about that view is difficult to determine.”
Judge Walters said Jones “lost [his] temper when [he] didn’t get the answer that [he] thought [he] deserved”.
He added that, having lost his temper, the defendant “subjected [Ms Evans] to gross violence over a period of time, before you ultimately extinguished her life by strangulation”.
The court was told in evidence that at the time of the attack, Ms Evans was wearing only a bath towel.
‘The rock of our family’
In a victim personal statement, Ms Evans’s sister Kerry Quinlan told the court she was “the rock of our family”.
She said Ms Evans was taken from them in a “senseless and cruel act”.
“Words cannot express fully how much of a loss this has been to her children,” she added.
“When they cry themselves to sleep wanting their mum, she isn’t there and never will be.”
Ms Quinlan added that Jones had “taken everything from us, all in the most despicable way possible”.
Ms Evans’s partner at the time, and the defendant’s son, Jamie Davies, said in a victim personal statement, read on his behalf, that they had both “trusted” Jones, and that Ms Evans had even been planning the defendant’s 50th birthday.
“The thought of having to live my life without Sophie causes me extreme pain and heartache,” he added.
Prosecuting, Michael Jones KC said the offence was aggravated by the defendant’s previous convictions and the fact Ms Evans was murdered in her home.
In mitigation, David Elias KC said there was a “lack of premeditation”.
A third man has been charged with murder over a house fire that killed a mother and her three children in Bradford last year.
Bryonie Gawith, 29, Denisty Birtle, nine, Oscar Birtle, five, and 22-month-old Aubree Birtle were killed in the fire on 21 August 2024.
Sharaz Ali, 39, from Bradford, has been charged with four counts of murder and one count of attempted murder.
He will appear at Bradford Magistrates Court today.
Two other men, Mohammed Shabir, 44, and Calum Sunderland, 25, both of Keighley, are due to go on trial next week after pleading not guilty to murdering Ms Gawith and the three children, and attempting to murder Ms Gawith’s sister, Antonia.
The children’s father Jonathan said at the time he was “absolutely distraught” by the “sudden loss” of his fiancee and “three beautiful children”.
“Bryonie and I were together for a long time, and we had a good life together. She was a beautiful woman and a loving mother to Oscar, Aubree and Denisty,” he said.
“I loved them with all my heart and if I had the chance, I would take their place in a heartbeat. I cannot imagine life without them.”
A family statement added: “Our B (Ms Gawith) was the life and soul of the party, music was a big part of her life, she loved music, singing and dancing, she would always be singing and dancing with Chuch (Denisty), Oggy (Oscar) and Strawberry (Aubree).
“B was always a really happy, joyful, bubbly beautiful woman, who cared for everyone and was loved by everyone, her kids were everything to her, her whole life.
“Oggy had the cheekiest smile, he was cheeky but he was a shy boy, Strawbs was shy and bashful with big blue eyes and blonde hair and Chuch was a beautiful, confident, outgoing and creative young girl.
“We are still trying to comprehend what has happened to our beautiful family. No words can describe how we are feeling and no words could ever make up for the profound loss we are now faced with.”