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The world's first human challenge trial in which volunteers were deliberately exposed to Covid-19 to advance research into the disease was found to be safe in healthy young adults, one of the companies running the study said on Wednesday. The data supports the safety of this model which could theoretically provide a "plug and play" platform for testing therapies and vaccines using the original Covid-19 strain as well as variants of the virus, Open Orphan, which carried out the study, said in a statement. Open Orphan is running the project, launched a year ago, with Imperial College London, the UK government's vaccines task force and the clinical company  hVIVO. The trial infected 36 healthy male and female volunteers aged 18-29 years with the original SARS-CoV-2 strain of the virus and closely monitored them in a controlled quarantined setting. They will be followed up for 12 months after discharge from the quarantine facility.

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.

A fourth dose of Covid-19 vaccine is not needed at present, as latest data shows first booster provides high levels of protection against Omicron variant among older adults, says the Joint Committee on Vaccination and Immunisation (JCVI). After analysing latest data from the UK Health Security Agency (UKHSA), JCVI said: "There is no immediate need to introduce a second booster dose, or fourth jab, to the most vulnerable". Data from UKSHA revealed that single booster dose provides around 90 per cent protection against hospitalisation to those aged 65 and over, even after three months of jab. However, protection against mild symptomatic infection is short-lived and drops to around 30 per cent by about three months. The study, which looked at booster doses in those aged over 65, showed that with two vaccine doses, protection against the infection drops to around 70 per cent after three months and to 50 per cent after six months.

Britain on Monday (January 10) put the biggest private health companies on high alert to deliver crucial treatments such as cancer surgery should Omicron overwhelm National Health Service hospitals in England. The United Kingdom's death toll from the Covid-19 pandemic stands at 150,154, the world's seventh worst official Covid toll after the United States, Brazil, India, Russia, Mexico and Peru. Prime minister Boris Johnson has bet on refraining from lockdowns to deal with the Omicron variant which in recent weeks has swept across the UK, albeit with death rates significantly lower than previous waves. In a sign of just how stretched the NHS could become, health secretary Sajid Javid ordered England's NHS to strike a three-month deal with private health companies to allow patients to get treatments such as cancer surgery outside. "Millions of patients have already got their tests and treatment quicker thanks to our existing deal with independent providers," said David Sloman, NHS England chief operating officer and Covid incident director.

Health and social care workers in England, including those working in community pharmacy, will no longer have to have a Covid jab as a condition of employment from later this month, the government said on Tuesday (March 1). The government had announced on January 31 that it intended to revoke the regulations that made vaccination compulsory, subject to the results of a public consultation. The decision was taken because the Omicron strain of the virus was less severe than the Delta variant, and due to high rates of vaccination of people in the UK. Health secretary Sajid Javid told parliament in a written statement that more than 90,000 health and social care workers and members of the public responded to the consultation.

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.

The minimum Covid-19 self-isolation period in England will be cut to five days from seven if someone tests negative twice, health secretary Sajid Javid said on Thursday (January 13) - a move that could reduce staffing disruption in businesses and infrastructure. The rapid spread of the Omicron variant has fuelled a spike in Covid-19 cases to record highs in Britain, and the surge has cause major disruption to the staffing of hospitals, schools and transport as staff have to self-isolate. "We've made the decision to reduce the minimum self-isolation period to five full days in England," Javid told parliament. "From Monday, people can test twice before they go, leaving isolation at the start of day six." The government had previously reduced isolation period to seven days from 10 days to people in England who get a negative result on a rapid lateral flow test two days in a row.

A news report suggests the Department of Health and Social Care is aiming to be ready to start charging for Covid-19 tests which are currently free at the end of June. Britain has been increasingly dependent on rapid testing to try to tackle the more-transmissible Omicron variant, which has spread rapidly through the population but is less severe. The government has previously said it will end the universal free provision of easy-to-use lateral flow devices (LFDs) at a "later stage", with individuals and businesses bearing the cost. The Department of Health has declined to say what the tests cost, citing commercial contracts. One source has told the Reuters news agency they can run to £30 for a pack of seven. Free pick up from pharmacies The tests have been made freely available to order online or pick up from local pharmacies since April. The UK Health Security Agency said that between December 30 and January 5 more than 8 million LFDs were conducted, the highest weekly figure on record.

Genomic sequencing allowed the world to track new coronavirus variants throughout the pandemic. Now British researchers plan to use it to better understand a host of other respiratory pathogens, from influenza to respiratory syncytial virus (RSV). The work is aimed at shedding more light on known threats and, potentially, emerging ones, the team at the Wellcome Sanger Institute, working with the UK Health Security Agency, said. The world has never had access to the kind of real-time information for these viruses that scientists obtained on SARS-CoV-2 through sequencing millions of genomes, Ewan Harrison, head of the new Respiratory Virus and Microbiome Initiative, told reporters on Monday. That includes granular detail on how they transmit as well as how they evolve in the face of the human immune response. "We hope that by expanding our ability to sequence these viruses routinely, we can build upon the work that's going on COVID, and hopefully supercharge research efforts to understand the transmission of these viruses, but also to help develop new treatments and vaccines," Harrison said.