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The Omicron variant of coronavirus is less likely to cause long Covid than previous variants, according to the first peer-reviewed study of its kind from the UK. Researchers at King's College London, using data from nearly 100,000 people who logged their Covid symptoms via an app, found the odds of developing long Covid after infection were 20 per cent to 50 per cent lower during the Omicron wave in the UK compared to Delta. The figure varied depending on the patient's age and the timing of their last vaccination. Long Covid, which includes prolonged symptoms ranging from fatigue to 'brain fog', can be debilitating and continue for weeks or months. It is increasingly being recognised as a public health problem, and researchers have been racing to find out if Omicron presents as big a risk of long Covid as previously dominant variants. The study from King's is believed to be the first academic research to show Omicron does not present as great a risk of long Covid, but that does not mean long Covid patient numbers are dropping, the team said. While the risk of long Covid was lower during Omicron, more people were infected, so the absolute number now suffering is higher. "It's good news, but please don't decommission any of your long Covid services," lead researcher Dr Claire Steves said, appealing to health-service providers.

British drugmaker AstraZeneca says it's confident that its new version of COVID-19 antibody treatment could protect immunocompromised patients against all known virus variants. Laboratory studies show the antibody, called AZD3152, neutralises all known variants of COVID-19 and AstraZeneca has support from regulators to make the treatment available by the end of this year, the company's vaccines head Iskra Reic said on Tuesday (April 18). AstraZeneca plans, pending more positive data and regulatory approval, to make the antibody available by the end of 2023. These types of therapies are most needed for people with compromised immune systems, either because of underlying conditions or because they are undergoing immune suppressing treatments. They account for nearly 2% of the global population. AstraZeneca's AZD3152, it new COVID-19 antibody, was acquired through a $157 million deal last year with British biotech start-up RQ Bio. The British drugmaker will likely make future investments like its current partnerships with RQ Bio but did not have any deals to announce, said Reic, a long-time AstraZeneca executive who has led the company's vaccines and immune therapies unit since it was formed in late 2021, during the pandemic.

It is not sustainable to give Covid-19 booster shots every three to six in the long term, Britain's chief scientific adviser said on Tuesday (January 4), even though the booster rollout is needed in the short term to combat the Omicron variant. "It would be a situation that isn't tenable to say everyone's going to need to be having another vaccine every three or six months. "That's not the long-term view of where this goes to," Patrick Vallance said at a news conference, adding that annual booster shots against Covid-19 might be necessary, similar to flu shots.

The world has never been in a better position to end the Covid-19 pandemic, the head of the World Health Organization said on September 14, his most optimistic outlook yet on the years-long health crisis which has killed over six million people. "We are not there yet. But the end is in sight," WHO Director-General Tedros Adhanom Ghebreyesus told reporters at a virtual press conference. That was the most upbeat assessment from the UN agency since it declared an international emergency in January 2020 and started describing Covid-19 as a pandemic three months later. The virus, which emerged in China in late 2019, has killed nearly 6.5 million people and infected 606 million, roiling global economies and overwhelming healthcare systems. The rollout of vaccines and therapies have helped to stem deaths and hospitalisations, and the Omicron variant which emerged late last year causes less severe disease. Deaths from Covid-19 last week were the lowest since March 2020, the U.N. agency reported.

There is a realistic possibility of large waves of Covid-19 infection in the future in Britain and such waves might even be considered likely, epidemiologists who model the Covid-19 pandemic to inform government advice have said. Prime minister Boris Johnson has ditched legal restrictions in England, saying that, while the pandemic was not over, Britain needs to learn to live with Covid. The Scientific Pandemic Influenza Group on Modelling, Operational sub-group (SPI-M-O) said the emergence of new viral variants was the biggest unknown factor in the medium-to-long term, along with waning population immunity and changes in mixing patterns. "Large future waves of infection that need active management to prevent detrimental pressure on the health and care sector are, at least, a realistic possibility (high confidence) or likely (medium confidence)," SPI-M-O said in a consensus statement published on Friday.

US biotech firm Moderna will build a new research and manufacturing centre in Britain to develop vaccines against new Covid-19 variants, other respiratory illnesses and help improve readiness for any future pandemics. The facility is expected to start producing shots in 2025 and Britain has made a commitment to buy Moderna's vaccines for the next decade under the agreement. Moderna's Covid-19 vaccines, which use messenger RNA (mRNA) technology, were among those deployed in Britain to tackle the crisis and enable prime minister Boris Johnson to reopen the economy from stringent lockdowns. Moderna chief executive Stephane Bancel said the priority was to develop a shot combining refreshed boosters against Covid, flu and Respiratory Syncytial Virus (RSV). "By building a plant in the UK, we are also providing the UK Government - which has a long term partnership with us, with this agreement - with the ability to be pandemic ready," Bancel said on Wednesday.