︽    ︾



    
         
   ︾      
           H1N1    ︽ 
︾      
       ︽ 
          
           
           
          H1N1      
  
N2               
  H1N2  H3 N1  H3 N2                          H3 
             
          H1N1      H1N1 
   
             
           
          H1N1      
         
            
   H1N1       
          1%  4%  
   H1N1         
     H1N1     
         
  H1N1          
                 