ONS: Impact of Delta and calendar time on symptoms reported by individuals testing swab positive – preliminary analysis of data (to 12 July 2021), 22 July 2021
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ONS: Impact of Delta and calendar time on vaccine effectiveness against new SARS-CoV-2 infection and Ct/viral burden in infections post-vaccination – preliminary analysis on data (to 12 July 2021), 22 July 2021
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Pfizer Covid vaccine declines faster than AstraZeneca: study
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