related_tweet: @greekleft @craig_a_spencer although az was not approved in the usa, fda said mixing between pfizer and moderna is ok for booster. if you take a step back, each vaccine shot is mimicking covid to trick your immune system. any booster shot should work. 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  be safe out there.