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GlaxoSmithKline (GSK) says initial tests of the antibody-based Covid-19 therapy it is developing with US partner Vir suggest the drug is effective against the Omicron variant. A GSK statement on Thursday (December 2) said that lab tests and a study on hamsters have demonstrated the sotrovimab antibody cocktail to work against viruses that were bio-engineered to carry a number of hallmark mutations of the new variant. The tests are continuing to confirm the results against all of the Omicron mutations, with an update expected by the end of the year, it added. The antibody is designed to latch on to the spike protein on the surface of the coronavirus, but Omicron has been found to have an unusually high amount of mutations on that protein. "Sotrovimab was deliberately designed with a mutating virus in mind," said Vir chief executive George Scangos, adding that the drug was targeting a region of the spike protein that was highly unlikely to mutate.