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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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