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(a) Corynebacterium kroppenstedtii (Ck) isolation subculture on horse blood agar after 48 h of incubation in aerobic conditions (original magnification, ×25). The first isolation was obtained after 4 days (not shown). (b) Ck isolation subculture on horse blood agar supplemented with 1% Tween 80 after 48 h of incubation in aerobic conditions (original magnification, ×25). The colonies were nonpigmented, small (diameter less then 1 mm), smooth, round, matt, and nonhaemolytic.
