Physicochemical 
                
             | 
              | 
        
        
            
                 
                
             | 
            
                 
                
             | 
            
                 
                (S)
             | 
        
        
            
                 
                
             | 
            
                 
                
             | 
            
                 
                
             | 
        
        
            
                 
                
             | 
            
                 
                
             | 
        
        
            
                 
                
             | 
            
                 
                
             | 
        
        
            
                 
                
             | 
            
                 
                (S)
            | 
        
        
            
                 
                
             | 
            
                 
                (S)
             | 
        
        
            
  | 
        
        
            | Stability of Infectivity (effects) | 
        
        
            
                 
                
             | 
        
        
            
                 
                
             | 
            
                 
                
             | 
            
                 
                
             | 
        
        
            
                 
                
             | 
            
                 
                
             | 
            
                 
                
             | 
        
        
            
                 
                1:200
             | 
            
                 
                <3.2 dex
             | 
            
                 
                5.7 dex
             | 
        
        
            
                 
                
             | 
        
        
            
  | 
        
        
            | Virion Morphology | 
        
        
            
                 
                Spherical particles
             | 
            
                 
                100 nm
             | 
        
        
            
                 
                104 nmnm
             | 
            
                 
                nm
             | 
        
        
            
                 
                Electron microscopy
             | 
            
                 
                Envelope observed
             | 
            
                 
                
             | 
        
        
            
  | 
        
        
            | Morphogenesis | 
        
        
            
                 
                
             | 
            
                 
                
             | 
            
                 
                
             | 
        
        
            
                 
                
             | 
            
                 
                
             | 
        
        
            
  | 
        
        
            | Hemagglutination | 
        
        
            
                 
                Yes
             | 
            
                 
                SM serum ext. by acetone
             | 
            
                 
                Goose
             | 
        
        
            
                 
                5.7-5.9
             | 
            
                 
                5.75
             | 
        
        
            
                 
                4dC - 37dC
             | 
            
                 
                37dC
             | 
        
        
            
                 
                Difficult to obtain good hemagglutinin.
             | 
        
        
            
                 
                HI, CF, and NT
             | 
        
        
            
                 
                Difficult to obtain good hemagglutinin.
             | 
        
        
            |   |