Different vaccines may yield different trial results – but experts say we shouldn't compare

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Digital generated image of COVID-19 vaccine bottles standing on cubes on white background visualising idea of competitions ceremony award 1/2/3 place.
Digital generated image of COVID-19 vaccine bottles standing on cubes on white background visualising idea of competitions ceremony award 1/2/3 place.
Andriy Onufriyenko

Members of the public are comparing approved Covid-19 vaccines that have been rolled out worldwide and asking questions about which jabs are the safest and most effective. Some of these include the mRNA vaccines by Pfizer-BioNTech and Moderna and the viral vector vaccines developed by Oxford-AstraZeneca and Johnson & Johnson (J&J).

In South Africa, the J&J vaccine is being administered to healthcare workers during Phase 1 of the country's inoculation strategy.

Health Minister Zweli Mkhize recently announced that SA secured 20 million doses of the Pfizer vaccine.

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