NEW YORK - Moderna’s new Covid-19 vaccine is five times better at boosting antibodies than its original jab, results have suggested.

The pharmaceutical firm said early clinical trials showed that the next-generation jab produced 9,500 units of antibody in vaccinated individuals compared to a maximum of 1,800 units with an original booster jab.

The company’s chief medical officer said that the new vaccine could boost a person’s antibodies to such high levels that a booster may only be needed annually.