A colony of Klebsiella pneumoniae (right) and Escherichia coli (left) on Endo agar. Cultivation in an aerobic atmosphere,
37°C, 24 hours. Both bacteria are lactose positive. Klebsiella pneumoniae usually grows in larger, mucoid colonies on
Endo agar. For Escherichia coli on Endo is typical greenish metallic sheen (see here).