smooth colony

smooth col·o·ny

a bacterial colony with a glistening, rounded surface; this type of colony is usually associated with increased virulence with respect to that of rough colonies.
Farlex Partner Medical Dictionary © Farlex 2012
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The isolate showed small, round, cream flat, smooth colony characteristics except on citrate agar it showed red brown, rust coloured colonies (Table 4).
It is of great interest that the recombination region of RRA1 and those of the clinical strains with smooth colony morphology, such as SP2 and NN2051, were the same.