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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                1:1000
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                <0.8 dex
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                6.6 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
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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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                5.7-7.6
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                6.4
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                37dC, 27dC, 25dC
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                27dC
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                Prototype strain failed to produce hemagglutinin, but strain
               6234 yielded a low-titered HA.
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                CF, NT, IFA
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                Prototype strain failed to produce hemagglutinin, but strain
               6234 yielded a low-titered HA.
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