WHO ‘advises against’ 2 COVID treatments that may not work on Omicron variants

COVID-19 has since evolved, and evidence from lab tests suggests the two therapies have limited clinical activity against the latest offshoots of the virus.

Two COVID-19 antibody therapies are no longer recommended by the World Health Organization (WHO), on the basis that Omicron and the variant’s latest offshoots have likely rendered them obsolete.

The two therapies – which are designed to work by binding to the spike protein of SARS-CoV-2 to neutralize the virus’ ability to infect cells – were some of the first medicines developed early in the pandemic.

READ MORE: Global cases of COVID, monkeypox trending down, but WHO warns against complacency

The virus has since evolved, and mounting evidence from lab tests suggests the two therapies – sotrovimab as well as casirivimab-imdevimab – have limited clinical activity against the latest iterations of the virus. As a result, they have also fallen out of favor with the U.S. health regulator.

On Thursday, WHO experts said they strongly advised against the use of the two therapies in patients with COVID-19, reversing previous conditional recommendations endorsing them, as part of a suite of recommendations published in the British Medical Journal.

GSK GSK.L and partner Vir Biotechnology’s VIR.O sotrovimab – which has generated billions in sales and became one of the British drugmaker’s top sellers last year – was pulled off the U.S. market by the U.S. Food and Drug Administration (FDA) in April.

Given the United States had begun to question sotrovimab’s clinical effectiveness against Omicron as early as February, the WHO’s realization is coming a little late, said Penny Ward, visiting professor in pharmaceutical medicine at King’s College London.

“Now WHO has issued this recommendation, it will be interesting to see how many other countries align with it,” she said.