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Britain's biotech firm Avacta Group on Monday (January 10) announced halting sales of its Covid-19 rapid antigen lateral flow test AffiDX to replace antibodies in the device and increase its ability to diagnose the Omicron variant. The company stated that AffiDX is capable of detecting Omicron when the virus is present in high numbers in samples, but the sensitivity of the test reduces at lower viral loads. The performance of all rapid antigen tests came under scanner in wake of a large number of mutations in the Omicron variant. AffiDX contains both a proprietary Affimer reagent and a commercially available antibody. The Affimer reagent detects the Omicron variant with the same sensitivity as the Delta variant, and performance of the antibody is paired with the Affimer reagent in the test. This has been affected by the additional Omicron mutations, the firm said. Alastair Smith, chief executive of Avacta Group, said: "Our determination to only provide high quality, high performance diagnostic tests has led us to the correct decision to pause all marketing of the AffiDX® lateral flow antigen test. We have, of course, been unable to market the product in the UK since October 2021, as the product continues to await approval under the new CTDA regulatory process.

England is set to reopen temporary field hospitals to contain a possible overspill of inpatients due to a surge in coronavirus cases, the national health service said Thursday. Fuelled by the highly contagious Omicron variant, daily cases have ballooned, standing at more than 183,000 on Wednesday. NHS England said it would start building the structures in the grounds of eight hospitals in cities including London, Bristol and Leeds from this week, with each designed to house around 100 extra patients. "Given the high level of Covid-19 infections and increasing hospital admissions, the NHS is now on a war footing," National medical director Stephen Powis said. The extra beds are designed for patients who are recovering from illnesses, including those who no longer have Covid, to free up space and staff to treat large numbers of virus cases.

The NHS Covid-19 vaccination programme has administered more than 40 million second doses following a bumper week that saw over 200,000 people coming forward for their second jab. Last week, more than 65,000 people aged 18 and over also stepped up to get their first dose of the Covid-19 jab. The NHS continued to encourage people to come forward for their first, second or third doses. Recent data from the UK Health Security Agency (UKHSA) showed that two doses of the vaccine are not enough to avoid the Omicron infection, but a booster significantly increases protection against the variant. Since the start of vaccination programme, NHS England has administered more than 113 million jabs in total. However, more than 1.1 million people aged 18 and over have still not come forward for their second dose.

British scientists said on Thursday (December 30) they would be studying whether higher doses of a cheap and widely used steroid called dexamethasone could work better for patients with severe Covid-19 compared to the standard low doses. Last year, the same scientists conducting the large trial, dubbed RECOVERY, showed that dexamethasone was able to save the lives of Covid-19 patients in what was called a "major breakthrough" in the coronavirus pandemic. They had found that a 6 mg daily dose of dexamethasone, which is used to reduce inflammation in diseases such as arthritis, cut death rates by around a third among the most severely ill Covid-19 patients in hospitals. "Given how quickly the Omicron variant is spreading, we can expect to see patients admitted to hospital with severe Covid-19 for a while to come," said Peter Horby, an Oxford University professor co-leading the trial.