Physicochemical 
                
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                (S)
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                (S)
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                (S)
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            | Stability of Infectivity (effects) | 
        
        
            
                 
                
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                1:1
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                6.2 dex
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                6.4 dex
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                5.2 dex
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                6.0 dex
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                1:100
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                6.1 dex
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                6.4 dex
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            | Virion Morphology | 
        
        
            
                 
                
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                <220 nm
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                nm
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                nm
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                Millipore filtration: After filtration = 6.4 dex;
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            | Morphogenesis | 
        
        
            
                 
                
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            | Hemagglutination | 
        
        
            
                 
                No
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                SMB ext. by sucrose-acetone
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                Goose
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                5.8-7.6
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                4dC, 27dC
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                CF, NT
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