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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            | Virion Morphology | 
        
        
            
                 
                
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                nm
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                nm
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            | Morphogenesis | 
        
        
            
                 
                
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            | Hemagglutination | 
        
        
            
                 
                Yes
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                SMB ext. by sucrose-acetone
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                Goose
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                5.75-6.2
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                6.0
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                22dC-37dC
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                37dC
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                HA production is difficult, usually of poor titre
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                CF, NT, IFA
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                HA production is difficult, usually of poor titre
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