Physicochemical 
                RNA, Single Strand
             | 
              | 
        
        
            
                 
                10
             | 
            
                 
                No
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                (S)
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             | 
        
        
            
                 
                
             | 
            
                 
                
             | 
        
        
            
                 
                
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             | 
            
                 
                (S)
            | 
        
        
            
                 
                
             | 
            
                 
                (S)
             | 
        
        
            
  | 
        
        
            | Stability of Infectivity (effects) | 
        
        
            
                 
                Stable at pH 6-9, inactivated at pH 3-5.
             | 
        
        
            
                 
                20%
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                3.0 dex
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                5.5 dex
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                5%
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                loss of 5 dex
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             | 
        
        
            
                 
                0.1%
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                0.5 dex
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                5.0 dex
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                Sensitive to interferon (9); resistant to 6-azauridine (9,11)
             | 
        
        
            
  | 
        
        
            | Virion Morphology | 
        
        
            
                 
                Spherical
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                70 nm
             | 
        
        
            
                 
                nm
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                nm
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                Electron microscopy
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                None
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  | 
        
        
            | Morphogenesis | 
        
        
            
                 
                Cytoplasm
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                Area of endoplasmic reticulum (9)
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  | 
        
        
            | Hemagglutination | 
        
        
            
                 
                No
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                SMB ext. by sucrose-acetone
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                Goose
             | 
        
        
            
                 
                5.75-7.2
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                4dC - 20dC
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                Other sources for antigen prod.:  infant rat brain, CE cell cult. 
              fluid; all were neg.
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                CF, NT (12,13)
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                Other sources for antigen prod.:  infant rat brain, CE cell cult. 
              fluid; all were neg.
             | 
        
        
            |   |