Everything you need to know about polio as Canada plans to start testing wastewater - National Post

So far, no cases have been identified in Canada, but most people infected with polio have no symptoms and can still give the virus to others for weeks

So far, no cases have been identified in Canada, but most people infected with polio have no symptoms and can still give the virus to others for weeks A worker walks alongside the Newtown Creek Was… [+8153 chars]

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