The World Health Organization's Special Envoy on Covid-19 said the announcement yesterday of a potential vaccine by Pfizer and BioNTech was great news, but one vaccine may not be enough to combat the virus.
The two companies said their experimental vaccine was more than 90% effective, in what could be a major victory in the fight against the coronavirus pandemic.
Protection in patients was achieved seven days after the second of two doses, and 28 days after the first, according to preliminary findings on the Pfizer and BioNTech vaccine.
Speaking on RTÉ;s Morning Ireland, Dr David Nabarro said the WHO is watching a number of vaccines that are in phase three trials and is hopeful that some will be licensed next year.