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(a) Number of cases of SARS by date of onset (n=1896) and dates of important control measures, Beijing, March–May 2003 [1, 3, 4]. (b) Daily estimates of the effective reproductive number Rt with 95% confidence intervals where the grey region indicates Rt⩽1. HCW, Health-care worker; PPE, personal protective equipment; WHO, World Health Organisation; MOH, China Ministry of Health.
