Children’s immune systems are better at recognising the coronavirus as a threat, helping to explain why they suffer less severely from Covid-19, research has found.
Scientists said children’s airways produced strong antiviral proteins that stopped the virus in its tracks without having encountered it before.
Adults have a more adaptive immune system that is trained to recognise threats it has seen before – which is the principle behind vaccination.
But children have a stronger innate response that recognises dangers automatically, researchers said.
“The innate immune system of children is more flexible and better able to respond to new threats,” said Dr Masahiro Yoshida, one of the authors of the University College London study.
He described a very quick immune response in children that “helps to explain why they are less severely affected by Covid-19”.
Children can still spread the virus, and are recommended for vaccines in many countries. School-age children had the highest rates of infection in the UK in the week ending on December 17.
But rates of serious illness and death are very low – fewer than 100 people under 15 have died from Covid-19 in England. Scientists said this was not previously fully understood.
The UCL study explained that the airway proteins, known as interferons, give a signal to nearby cells to tighten their defences against an intruding virus.
Adults produce them too, but they were found to be stronger, more numerous and generated more quickly in children.
Interferons have been studied as a possible therapy for Covid-19, while researchers say a nasal swab could be used to measure the immune response in adults.
The findings are based on blood samples from 78 people, including children and adults infected by the virus.
This produced a data set of more than 650,000 individual cells that revealed dozens of cell types in the airways and blood – including some never previously described.
In addition, children were less prone to a dangerous effect in which the immune system works against the body by attacking infected cells. This is known as a cytotoxic response.
“Once the virus has spread to several areas of the body, organ damage can be caused by the immune system trying and failing to control the infection,” said Dr Marko Nikolic, another UCL study author.
“Our study shows that not only do children respond better initially, if the virus does enter the blood the cytotoxic response is less forceful.”
The research from UCL, the Wellcome Sanger Institute and their collaborators is published in Nature.
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THE BIO
Favourite book: ‘Purpose Driven Life’ by Rick Warren
Favourite travel destination: Switzerland
Hobbies: Travelling and following motivational speeches and speakers
Favourite place in UAE: Dubai Museum
South Africa v India schedule
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The story in numbers
18
This is how many recognised sects Lebanon is home to, along with about four million citizens
450,000
More than this many Palestinian refugees are registered with UNRWA in Lebanon, with about 45 per cent of them living in the country’s 12 refugee camps
1.5 million
There are just under 1 million Syrian refugees registered with the UN, although the government puts the figure upwards of 1.5m
73
The percentage of stateless people in Lebanon, who are not of Palestinian origin, born to a Lebanese mother, according to a 2012-2013 study by human rights organisation Frontiers Ruwad Association
18,000
The number of marriages recorded between Lebanese women and foreigners between the years 1995 and 2008, according to a 2009 study backed by the UN Development Programme
77,400
The number of people believed to be affected by the current nationality law, according to the 2009 UN study
4,926
This is how many Lebanese-Palestinian households there were in Lebanon in 2016, according to a census by the Lebanese-Palestinian dialogue committee
Company profile
Date started: 2015
Founder: John Tsioris and Ioanna Angelidaki
Based: Dubai
Sector: Online grocery delivery
Staff: 200
Funding: Undisclosed, but investors include the Jabbar Internet Group and Venture Friends
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West Brom: Livermore (79'), Rondón (88' )
Liverpool: Ings (4'), Salah (72')
The five pillars of Islam
Multitasking pays off for money goals
Tackling money goals one at a time cost financial literacy expert Barbara O'Neill at least $1 million.
That's how much Ms O'Neill, a distinguished professor at Rutgers University in the US, figures she lost by starting saving for retirement only after she had created an emergency fund, bought a car with cash and purchased a home.
"I tell students that eventually, 30 years later, I hit the million-dollar mark, but I could've had $2 million," Ms O'Neill says.
Too often, financial experts say, people want to attack their money goals one at a time: "As soon as I pay off my credit card debt, then I'll start saving for a home," or, "As soon as I pay off my student loan debt, then I'll start saving for retirement"."
People do not realise how costly the words "as soon as" can be. Paying off debt is a worthy goal, but it should not come at the expense of other goals, particularly saving for retirement. The sooner money is contributed, the longer it can benefit from compounded returns. Compounded returns are when your investment gains earn their own gains, which can dramatically increase your balances over time.
"By putting off saving for the future, you are really inhibiting yourself from benefiting from that wonderful magic," says Kimberly Zimmerman Rand , an accredited financial counsellor and principal at Dragonfly Financial Solutions in Boston. "If you can start saving today ... you are going to have a lot more five years from now than if you decide to pay off debt for three years and start saving in year four."
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Benefits of first-time home buyers' scheme
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- Discounts on sales price of off-plan units
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- Mortgages with better interest rates, faster approval times and reduced fees
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Read more about the coronavirus
Who are the Sacklers?
The Sackler family is a transatlantic dynasty that owns Purdue Pharma, which manufactures and markets OxyContin, one of the drugs at the centre of America's opioids crisis. The family is well known for their generous philanthropy towards the world's top cultural institutions, including Guggenheim Museum, the National Portrait Gallery, Tate in Britain, Yale University and the Serpentine Gallery, to name a few. Two branches of the family control Purdue Pharma.
Isaac Sackler and Sophie Greenberg were Jewish immigrants who arrived in New York before the First World War. They had three sons. The first, Arthur, died before OxyContin was invented. The second, Mortimer, who died aged 93 in 2010, was a former chief executive of Purdue Pharma. The third, Raymond, died aged 97 in 2017 and was also a former chief executive of Purdue Pharma.
It was Arthur, a psychiatrist and pharmaceutical marketeer, who started the family business dynasty. He and his brothers bought a small company called Purdue Frederick; among their first products were laxatives and prescription earwax remover.
Arthur's branch of the family has not been involved in Purdue for many years and his daughter, Elizabeth, has spoken out against it, saying the company's role in America's drugs crisis is "morally abhorrent".
The lawsuits that were brought by the attorneys general of New York and Massachussetts named eight Sacklers. This includes Kathe, Mortimer, Richard, Jonathan and Ilene Sackler Lefcourt, who are all the children of either Mortimer or Raymond. Then there's Theresa Sackler, who is Mortimer senior's widow; Beverly, Raymond's widow; and David Sackler, Raymond's grandson.
Members of the Sackler family are rarely seen in public.
Like a Fading Shadow
Antonio Muñoz Molina
Translated from the Spanish by Camilo A. Ramirez
Tuskar Rock Press (pp. 310)
Mohammed bin Zayed Majlis
Dhadak
Director: Shashank Khaitan
Starring: Janhvi Kapoor, Ishaan Khattar, Ashutosh Rana
Stars: 3
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COMPANY PROFILE
Name: Lamsa
Founder: Badr Ward
Launched: 2014
Employees: 60
Based: Abu Dhabi
Sector: EdTech
Funding to date: $15 million