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The tier system’s mixed results in containing Covid-19 and the more infectious variant mean that a strict national lockdown may be necessary, warn Professor Andrew Hayward, Professor Robert West (both Ïã¸ÛÁùºÏ²ÊÖÐÌØÍø Epidemiology & Health) and Professor Christina Pagel (Ïã¸ÛÁùºÏ²ÊÖÐÌØÍø Mathematics).

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