B. pertussis colonies growing on Regan-Lowe medium yields which of the following colonial morphologic appearances?

a. Star-shaped colonies
b. Mercury-drop colonies
c. Yellow-pigmented colonies
d. Shiny black-pigmented colonies


B
Young colonies of B. pertussis and B. parapertussis are small and shiny, resembling mercury drops; colonies become whitish-gray with age (Figure 37-1).

Biology & Microbiology

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