GENEVA (BLOOMBERG) - Coronavirus shots should be rolled out to over 100 countries in the next couple of weeks, from 84 at present, with a shortage of supplies the limiting factor, said one of the leaders of the World Health Organisation's vaccine initiative.

"If we had more doses, we could make these available," Seth Berkley, chief executive officer of Gavi Alliance, a public-private partnership that works to provide vaccines for developing countries, told CBS News' "Face the Nation".