SUMMARY: The polypeptide and antigenic profiles of Nichols strain and two other more recently isolated ‘street’ strains of have been compared. PAGE and immunoblotting identified a 34.5 kDa polypeptide present in the Nichols strain which was absent from one of the other street strains. This polypeptide was shown to be associated with the axial filament in Three other axial-filament-associated polypeptides of 37, 33 and 30 kDa were present in all strains examined. Axial filaments of all three strains were morphologically identical and all three strains were equally motile.


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