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Pfizer and Moderna say COVID-19 vaccines wane over time

      

      

        
          By Brian Chang | 
          chinadaily.com.cn |
          Updated: 2021-09-17 00:07
        
        
          
          
          
          
        

      



      

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On Wednesday, Pfizer and Moderna said the efficacy of their COVID-19 vaccines wane over time.

        
      


      
      
    

      

        
        
      

    
        
        

          
        
          
        

         
        
      
      
    
        
      
      
    
   
      
        

        
      

      

        
      

        
       
        
      

    
        
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