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What is Janssen Vaccine Efficacy and Safety Study about?

1) This study evaluated the efficacy and safety of the Ad26.COV2.S vaccine for preventing COVID-19 in adults aged 18 and older. 2) Preliminary results found the vaccine was 66.9% effective at preventing moderate to severe COVID-19 at least 14 days after vaccination. Effectiveness was 66.1% at least 28 days after vaccination. 3) The most common side effects were pain at the injection site, headache, fatigue, and muscle aches, which generally resolved within 1-2 days. No serious safety concerns were ident

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