Which organism may be mistaken for a lactose fermenter on MacConkey agar because of colonies exhibiting a purple hue on the media?
a. Acinetobacter spp.
b. P. luteola
c. S. maltophilia
d. Bordetella holmesii
A
Although a nonlactose fermenter, Acinetobacter spp. produces colonies that exhibit a purplish hue and may cause the organism to be mistaken for a lactose fermenter. The other organisms are nonlactose fermenters as well; however, they do not demonstrate this characteristic.
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Fill in the blank(s) with the appropriate word(s).
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