Glaxo Says Its Antibody Drug Works Against Omicron

GlaxoSmithKline PLC and Vir Biotechnology Inc. said their Covid-19 antibody treatment retained effectiveness against the Omicron variant in laboratory studies, even as early data suggests that similar treatments work less well against the highly mutated strain.

The results provide hope that at least one monoclonal antibody therapy—a form of treatment that has proven useful in blunting severe disease—will remain effective against Omicron, which has been detected in dozens of countries including the U.S. since it was identified by scientists in South Africa two weeks ago.