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— simonthong aka kitty poo (@KittyPo80176717) July 18, 2022
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Effectiveness of a fourth dose of covid-19 mRNA vaccine against the omicron variant among long term care residentsโฆ. | โฆ@bmj_latestโฉ A 4th dose increased protection against infection, symptomatic infection, and severe outcomes during Omicron. https://t.co/7HqnTnYwnC
— Carlos del Rio (@CarlosdelRio7) July 12, 2022
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A 4th dose in frailer elderly gives extra protection, but mainly against severe outcomes.
— Prof Peter Collignon (@CollignonPeter) July 12, 2022
The marginal effectiveness of a fourth dose versus a third dose was 19% against infection, 31% against symptomatic infection, and 40% against severe outcomes. https://t.co/qqLMfCdQpQ
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