A microbiologist is reading stool culture plates. She sees an organism that has a large, mucoid pink colony on MAC. What is a good presumptive identification of this organism?
A) Enteric pathogen
B) Escherichia/Citrobacter-like organism
C) Klebsiella/Enterobacter-like organism
D) Haemophilus influenzae

Question

Quizplus · Accepted Answer

Klebsiella and Enterobacter are both known to produce mucoid, pink-colored colonies on MAC. This is due to production of an exopolysaccharide called colanic acid. However, further testing would be needed to confirm the exact species of organism present.

A Microbiologist Is Reading Stool Culture Plates