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Council of Chief Medical Officers of Health Communication: Use of Non-Medical Masks (or Facial Coverings) by the Public

OTTAWA, April 7, 2020 /CNW/ - Canadian public health guidance related to COVID-19 has been changing as the evidence base and our understanding of COVID-19 is rapidly evolving. We are continually looking at the evidence as it is being produced and working with our partners across the country and around the world to learn more. Now that more countries have had large numbers of cases and have analysed transmission patterns, recent studies provide evidence that transmission of the virus can happen from infected peoplea??before they develop symptoms. We refer to this as pre-symptomatic transmission.A  There is also evidence that some infected people who never develop symptoms are also able to transmit the virus. This is called asymptomatic transmission. We do not know how much of a role pre-symptomatic and asymptomatic transmission play in driving this epidemic at this timea??but we know that it is occurring among those with close contact or in close physical settings.While theA primary driver of the global pandemic of COVID-19 has been individuals with visible symptoms (coughing and respiratory droplets are key ways the virus is spread), evidence of asymptomatic or pre-symptomatic transmission points to the importance of everyone, even those who feel fine, following the proven methods of preventing transmission. To prevent transmission of COVID-19 here is what we know is proven:
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