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Monday, Aug 04, 2025

UK government panel claims Covid mutation with 35% death rate a ‘realistic possibility,’ suggests new strains may ‘evade’ vaccines

UK government panel claims Covid mutation with 35% death rate a ‘realistic possibility,’ suggests new strains may ‘evade’ vaccines

A British government science panel has claimed that a coronavirus variant with a 35% fatality rate – akin to that seen in the Middle East Respiratory Syndrome (MERS) – could emerge, and that vaccine booster doses may be needed.
A report issued on Friday by the Scientific Advisory Group for Emergencies (SAGE) looked at a series of hypothetical scenarios related to Covid-19 variants, finding it a “realistic possibility” that a mutation could appear with a case fatality rate comparable to SARS (10%) or MERS (35%), both of which belong to the coronavirus family.

While the body said that existing vaccines would remain effective against “serious disease” from such a variant except in the case of “significant drift” in the virus’ spike proteins, it nonetheless added that “an increase in morbidity and mortality would be expected even in the face of vaccination,” as inoculation does not “fully prevent infection in most individuals.”

The report suggested a number of ways to deal with a more deadly mutation, including “vaccine booster doses to maintain protection against severe disease” and measures to limit the introduction of new variants from abroad.

SAGE also considered the likelihood of a variant that “evades current vaccines,” saying that could occur in several ways. The most likely cause would be a form of genetic variation known as “antigenic drift,” which happens when a virus mutates to a point when antibodies that prevented infection caused by previous strains no longer work.

The panel deemed that “almost certain” to happen to some degree. A “worst-case” scenario described in the paper might occur when a patient’s immune system was no longer able to produce antibodies for new variants, either due to its past contact with the virus or as a result of “previously experienced vaccines.” Such a doomsday scenario would make it “difficult to revaccinate” patients, but the researchers concluded that outcome was “less likely”.

The same agency released a separate report on vaccines on Friday, which found that immunity is “highly likely” to diminish over time, suggesting “there will be vaccination campaigns against SARS-CoV-2 for many years to come.”

However, the report on variants also noted that the novel coronavirus could follow an evolutionary path that sees it become more transmissible but less virulent, with SAGE drawing a comparison with “common colds.” It added that, while this is “unlikely in the short term,” it could later become a “realistic possibility” as the virus fully adapts to its human hosts.

SAGE concluded that the UK should continue to “proactively support” a global vaccination drive, saying that could help reduce the likelihood of “dangerous variants emerging in other parts of the world”. It also called for increased investment in viral surveillance to keep tabs on mutations.

To date, the UK has tallied some 5.8 million coronavirus infections and just shy of 130,000 fatalities, according to data compiled by Johns Hopkins University in the US. While the country saw a lull in cases over the spring, summer has brought a new spike, which officials attribute to the more contagious Delta variant first observed in India. Daily deaths have topped 100 several times over the last week, also marking an increase on the spring tally, with new cases per day in the tens of thousands.

Despite the recent surge, however, the British government moved ahead with its planned reopening earlier this month, lifting most of its Covid restrictions after imposing months of crippling lockdowns and business closures. Prime Minister Boris Johnson has defended the move as necessary, but nonetheless urged Britons to exercise “all the right prudence and respect for other people and the risks that the disease continues to present.”
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