Antibody cocktail drugs that offered great hope in treating Covid may be ineffective against worrying new variants of the virus, research suggests.
Lab tests found the experimental treatments, known as monoclonal antibodies, failed to neutralise strains which emerged in Kent, South Africa and Brazil.
The drugs are derived from cloning a single antibody, a virus-fighting protein, found in people who ve recovered from Covid. Scientists make thousands of copies of the antibody in a lab before injecting them into people who struggle to mount a natural immune response.
One of the most promising monoclonal antibody candidates, made by Regeneron in the US, was used on Donald Trump on October 2 last year during his Covid battle and may have helped him recover.
Monoclonal antibodies: great hope in Covid treatments fails against variants
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Jusqu à 80% moins de risque d infections à la COVID grâce à des anticorps de synthèse
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