World Health Organisation Collaborating Centre for Infectious Disease Epidemiology and Control Archives

Wednesday, 8 October, 2025

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44% of secondary COVID-19 infections may occur in pre-symptomatic window

MBriefWSM - August 19, 2020 0

Public use of surgical masks 'could help slow' COVID-19 pandemic's advance

MBriefWSM - April 8, 2020 0

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Tag: World Health Organisation Collaborating Centre for Infectious Disease Epidemiology and Control

44% of secondary COVID-19 infections may occur in pre-symptomatic window

Public use of surgical masks 'could help slow' COVID-19 pandemic's advance

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