related_tweet: convalescent plasma &amp; variants 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
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  convalescent plasma is[] a therapy derived from the blood of patients who have recovered from covid-19, which contains antibodies to fight off the virus.