https://www.reuters.com/business/healthcare-pharmaceuticals/jj-booster-84-effective-against-hospitalization-safrican-omicron-era-study-2021-12-30/
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A booster dose of Johnson & Johnson Inc's <a href="https://www.reuters.com/companies/JNJ.N" target="_blank">(JNJ.N)</a> single-dose COVID-19 vaccine was 84% effective at preventing hospitalization in South African healthcare workers who became infected as the…
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