Masks did not reduce risk of COVID infection after first Omicron wave, UK research shows

masks did not reduce risk of covid infection after first omicron wave, uk research shows

A lady in a face mask looks at her phone amid the coronavirus disease (COVID-19) Omicron wave in Singapore, February 17, 2022.

After the first Omicron wave, many of the risks of Covid infection changed. Before February 2022, wearing face masks and being over 70 were credited with a reduced risk of being infected by others – but not after that, according to a new study at the University of East Anglia (UEA) in Norwich, the UK.

The analysis of official data found that several risk factors for infection altered significantly as the dominant variant in the UK and most countries around the world changed from Delta to Omicron in December 2021. These included wearing a mask, a history of foreign travel, household size, whether people were working or retired, and contact with children or people over the age of 70. In addition, traveling abroad was not associated with increased risk prior to February 2022 but then became a significant risk.

Lead author Prof. Paul Hunter of Norwich Medical School said: “Early in the pandemic, there were many studies published looking at risk factors for catching the new Coronavirus, but far fewer studies after the first year or so. Our research shows that there were changes in some risk factors around the time that the Omicron BA.2 variant became dominant.”

'Not particularly surprising'

Co-author Dr. Julii Brainard said: “This isn’t totally surprising because laboratory evidence suggests that the Omicron variant was better able to infect the cells lining the upper respiratory tract than previous variants, and so be more transmissible.  “Management of infection risk needs to be agile, adapting to epidemic development and better-quality information when it emerges. To prevent infections, we need to have a good view of which factors might be most or least relevant. If those factors can change, we need to be alert to that happening.”

masks did not reduce risk of covid infection after first omicron wave, uk research shows

Jerald Bagley, 57, receives the Moderna coronavirus disease (COVID-19) booster vaccine targeting BA.4 and BA.5 Omicron sub variants at Skippack Pharmacy in Schwenksville, Pennsylvania, U.S., September 8, 2022. (credit: REUTERS/HANNAH BEIER)

Jerald Bagley, 57, receives the Moderna coronavirus disease (COVID-19) booster vaccine targeting BA.4 and BA.5 Omicron sub variants at Skippack Pharmacy in Schwenksville, Pennsylvania, U.S., September 8, 2022. (credit: REUTERS/HANNAH BEIER)

The team published the study in the journal PLOS titled “Changing risk factors for developing SARS-CoV-2 infection from Delta to Omicron.”

The researchers analyzed data available from England’s Office for National Statistics (ONS) COVID survey, which compared infection rates with an ongoing household survey of the population to estimate the number of people with infections.

From November 2021 to May 2022, the ONS also asked people questions about their circumstances and habits to see if those factors could be linked to the risk of positivity. “We used this dataset to look for constancy or change in the importance and direction of potential risk factors for testing positive. We applied a statistical method called meta-regression to do this,” Hunter added.

In November 2021, always wearing face masks at work, school, or in enclosed spaces was connected with a reduced risk of being infected in both adults and children, but after the first Omicron wave, it was not. Living in a house with five or more people was a risk at the beginning, but by the end of the study period, people in larger households (four and above) had negligibly greater risk than people living in single-person households.

Early overseas travel was not associated with increased risk, but later on, it was. Working in health or social care or in contact with others was often found to be important in the first year of the pandemic but was not associated with an overall higher or changing risk of infection in the study period. Being a member of an ethnic minority was strongly associated with increased risk in the first few months of the UK epidemic. Still, it posed a lower risk and no significant trend change during the study’s full monitoring period.

Being retired was associated with reduced risk compared to those in work overall, but any protective effect had disappeared by February 27, 2022, which coincided with the start of the second Omicron wave. By the end of February 2022, it became apparent that there was a decrease in risk for adults living with children aged 16 or under. People under 70 who lived with someone aged 70 or older initially had a lower likelihood of testing positive, but this protective effect diminished by about mid-February 2022.

The researchers said the balance of evidence shows that wearing face coverings reduce transmission of respiratory infections in community settings and reduce transmission of the virus, but the question is by how much.

Systematic review of pre-pandemic evidence and analysis of original survey data during the pandemic both indicated that mask-wearing could or did reduce transmission by about 19%, but these conclusions were derived mainly from data prior to the emergence of Omicron variants.

This latest research found that prior to Omicron BA.2, never wearing a mask was associated with an increased risk of around 30% in adults and 10% in children. However, by the second Omicron wave (mid-to-late February 2022 onwards), mask-wearing had no protective effect on adults and possibly increased the risk of infection in children.

“It should not be a surprise that risk factors change during a pandemic due to a highly infectious disease with a short duration of immunity like COVID-10,” Hunter said. “We offer some possible explanations for why the changes may have happened, but we would need more focused research to understand for sure why there were changes in some risk factors,” Brainard concluded.

OTHER NEWS

15 minutes ago

"I'd take a cut" - When Michael Jordan said he'd "love to see" Larry Bird on the Chicago Bulls in 1990

15 minutes ago

‘Badly handled’: Labor’s renewables projects causing ‘real disconnect’ with Australians

16 minutes ago

Oscar-nominated French actor Anouk Aimée, who starred in La Dolce Vita, dies aged 92

17 minutes ago

Wales blow as flanker Jac Morgan ruled out of summer Tests through injury

17 minutes ago

Struggling to hear the television? Here are seven simple steps to boost your hearing

17 minutes ago

Revealed: How England unwind with drill music - and James Morrison! - and who controls the speakers as Gareth Southgate's players settle into their plush Euro 2024 resort

17 minutes ago

Georgia's Khvicha Kvaratskhelia - who had 45 shots on target in Serie A this season - is 5/1 to have two or more against Turkey in their Euro 2024 opener today

17 minutes ago

Nick Knowles, 61, enjoys a day at the races with chic fiancée Katie Dadzie, 33, as they lead the star-studded turnout on day one of Royal Ascot

17 minutes ago

Video: Ruidoso fire: Immediate evacuation ordered in New Mexico village as map shows areas affected with major highways closed

17 minutes ago

Video: Adorable moment girl, 7, who beat cancer and is now in need of a lung transplant finds out she is going to Taylor Swift's Eras Tour on its 100th show

17 minutes ago

Kenan Thompson Reveals What He Believes Is The Key To ‘Saturday Night Live’s Enduring Success

17 minutes ago

French actress Anouk Aimée, a Golden Globe-winner for her role in 'A Man and a Woman,' has died at 92, her agent says

17 minutes ago

French actress Anouk Aimée, a Golden Globe-winner for her role in 'A Man and a Woman,' dies at 92

17 minutes ago

Euro 2024: Kylian Mbappé set to miss next France game - sources

17 minutes ago

Sources: Jeff Van Gundy agrees to be Clippers' lead assistant

20 minutes ago

US Navy developing new sea-launched nuclear missile

20 minutes ago

Revolut launches new loyalty scheme - and you could get free air miles

20 minutes ago

France get off to winning start against Austria but given Kylian Mbappé scare

20 minutes ago

Best affordable wedding dresses of 2024 for a stunning look that won't break the bank

20 minutes ago

China's property measures give sales a boost, but only in big cities

20 minutes ago

Never mind the politics. The Bank of England must cut interest rates now to save the economy

20 minutes ago

Turkey vs Georgia: Euro 2024 prediction, kick-off time, TV, live stream, team news, h2h, odds today

20 minutes ago

Winter Storm Warning for Two States as 15 Inches of Snow Could Hit

21 minutes ago

14-year-old among those injured after being struck by gunfire at 63rd St. beach

22 minutes ago

Vicky Pattison sports a stylish puff-sleeve dress and a wacky green fascinator with a giant cookie on it as she attends first day of Royal Ascot

22 minutes ago

Authorities crack down on illegal IPTV boxes after a man who sold them is finally jailed for four-and-a-half years - after he went on the run when convicted over £350,000 scheme

22 minutes ago

Jahvid Gadd learns his fate over brutal attack of a woman in her Mildura home

22 minutes ago

Harry Garside reveals the one distraction that helped him through his court case ordeal after Olympics 2024 star was falsely accused of domestic violence by ex-girlfriend

22 minutes ago

Red Wiggle Caterina Mete shares pregnancy update ahead of welcoming twin baby girls

22 minutes ago

AMANDA PLATELL: Lies, vicious rumours and dirty tricks: So who IS trying to kill of Strictly Giovanni?

24 minutes ago

KZN Premier officially takes his place at province’s helm, announces new Cabinet

25 minutes ago

Deadly Premier League fixture run involving Arsenal and Liverpool to all but decide title

25 minutes ago

Man Utd fixtures 2024/25 in full: Erik ten Hag faces difficult Christmas and tough run-in

25 minutes ago

Orlando Pirates legend compares star to Real Madrid prodigy

25 minutes ago

‘I racked up £68k of student debt for a degree I don’t even use’

25 minutes ago

Economic policies dominate Iran's presidential debate ahead of June 28 vote

25 minutes ago

First Time Since 2014, Opposition To Get Leader In Lok Sabha But It May Not Be Rahul Gandhi

25 minutes ago

Gas to play a ‘very significant role’ in firming up Australia’s energy supply: Littleproud

26 minutes ago

Jaylen Brown, Jayson Tatum, Al Horford, team work lead Celtics to 18th NBA championship

26 minutes ago

Turkey vs Georgia LIVE: Euro 2024 team news, line-ups and more ahead of Group F match today