Healthcare workers must have a choice of Covid-19 booster vaccines, said the SA Medical Association (SAMA). This follows the news that Johnson & Johnson (J&J) won the right to run research on the

500 000 health workers who received the company’s shot in an initial study. SAMA said it was concerned because of potential evidence that a booster in the form of a messenger ribonucleic acid, or mRNA, vaccine such as those produced by Pfizer was potentially more effective than a second dose of a more traditional vector-based shot, such as that produced by J&J. – Bloomberg News

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