A number of Covid-19 vaccine candidates are undergoing late-stage trials and if successful, may be used to inoculate millions from as early as next month.

Singapore has been in talks with pharmaceutical companies working on some of them, to secure doses for people here, said Health Minister Gan Kim Yong.

They include Pfizer, the United States company which announced that the vaccine it is developing with German company BioNTech has proven 90 per cent effective in clinical trials.