SA vaccine trial shocked by how many people already had Covid-19
‘We did not anticipate high number of asymptomatic people, which shows how extensive infection rate is’
Almost a fifth of the 474 South Africans screened for SA’s Covid-19 vaccination trial were excluded from participation due to underlying conditions, including untreated hypertension, a lead researcher told Times Select.
Sub-investigator Clare Cutland said of that number, 202 had been enrolled in the trial and vaccinated to date.
She said 35 of the 162 patients enrolled by Monday (21%) tested positive for Covid-19 before receiving the vaccine...