Johnson & Johnson says its single-dose vaccine is 72-percent effective in preventing Covid-19 in the United States but a lower rate of 66-percent is observed globally. In South Africa it is only 57-percent effective - this follows a large trial conducted across three continents and against multiple variants. - Smile 90.4FM

Johnson & Johnson says its single-dose vaccine is 72-percent effective in preventing Covid-19 in the United States but a lower rate of 66-percent is observed globally. In South Africa it is only 57-percent effective – this follows a large trial conducted across three continents and against multiple variants.