Esterases of 15 strains of 14 strains of and 13 strains of were resolved by horizontal electrophoresis in polyacrylamide-agarose gel. Esterase bands were defined by their range of activity towards several synthetic substrates and their sensitivity or resistance to di-isopropyl fluorophosphate. strains showed three to five major esterase bands and three minor bands. strains showed three or four major bands and one minor band. strains showed three to five major bands and one minor band. The comparative distribution of bands revealed that these three newly described species could be distinguished by the electrophoretic patterns of their esterases. Congruence was found between biotypes 1 and 2 of and These species-specific patterns were different from those of and previously characterized.


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