Regeneron antibody saves lives in some hospitalized Covid patients, study finds

“If they have, there’s no need to give them more. If they haven’t got antibodies of their own, then giving them this combination of two antibodies by an intravenous infusion then actually reduces their chances of dying by a fifth.”

In these so-called seronegative patients, who were infected but who had not mounted their own antibody response, the benefit was dramatic. The addition of the monoclonal antibody cocktail reduced the percentage of patients who died from 30% to 24%. That is a 20% relative reduction. It means that for every 100 patients who were treated with the antibody cocktail, six fewer died.