claim: low prevalence of sars-cov-2 antibodies in care homes affected by covid-19 ; a prospective cohort study in england
evidence_1: more than two-thirds of residents and staff members had detectable antibodies against sars-cov-2 irrespective of their nasal swab rt-pcr positivity or symptoms status.", "methods: residents and staff had a convalescent blood sample for sars-cov-2 antibody levels and neutralising antibodies by sars-cov-2 rt-pcr five weeks after the primary covid-19 outbreak investigation.", "conclusions: rt-pcr testing for sars- cov-2 significantly underestimates the true extent of an outbreak in institutional settings."
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
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