Under what circumstance might slow-growing mycobacteria appear to produce colonies in a few days?
A)When the inoculum is too heavy
B)When subcultured to an enriched medium
C)When incubated at slightly warmer temperatures
D)When kept in the light

Question

Quizplus · Accepted Answer

The rate of growth is an important criterion for determining the initial category of an isolate.The dilution of the organism used to assess the growth rate is critical.Slow-growing mycobacteria appear to produce colonies in less than 7 days if the inoculum is too heavy.Rapid-growers usually produce colonies within 3 to 4 days after subculture.Even a rapid-grower,however,may take longer than 7 days to produce colonies initially because of the inhibition by a harsh decontaminating procedure.Therefore the subculture must determine the growth rate and pigment production.

Under What Circumstance Might Slow-Growing Mycobacteria Appear to Produce Colonies