The two vaccines used in South Africa’s vaccination programme, those from Johnson & Johnson and Pfizer/BioNTech, have both been shown to be highly effective against COVID-19, particularly in preventing hospitalisation and death. But protection may wane over time and new variants may or may not render these vaccines less effective. Adele Baleta unpacks what we do and do not know about the potential need for booster shots and surveys some of the studies that will help fill the gaps.
Local researchers have welcomed impressive phase III findings for the Russian-made Sputnik V vaccine published this week in the Lancet medical journal. It is the sixth COVID-19 vaccine found to be effective in preliminary data from a phase III randomised controlled trial and the fourth to have phase III findings published in a leading medical journal.