PRO/AH/EDR> COVID-19 update (56): meat facility outbreak, vacc 2nd dose, routes, WHO, global

COVID-19 -- Canada
Abstract
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The emergence of SARS-CoV-2 variants raises concerns about their resistance to neutralizing antibodies elicited from previous infection, or from vaccination. Here we examined whether sera and monoclonal antibodies from convalescent donors, prior to and following a single immunization with the Pfizer or Moderna mRNA vaccines, neutralize the Wuhan-Hu-1 strain and a variant, B.1.351 from South Africa. Prevaccination sera weakly neutralized Wuhan-Hu-1 and sporadically

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