universal maskingCOVID-19SARS-CoV-2Hong Kong Department of Health
…ontrol, isolation of cases and quarantine of their contacts and universal masking. During this period, attack rates in Hong Kong were among the l…
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Programmes, procedures, policies, and other actions being evaluated. Examples include screening, surgery, public-health programmes.
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…ontrol, isolation of cases and quarantine of their contacts and universal masking. During this period, attack rates in Hong Kong were among the l…