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Escherichia coli lactose positive colonies on MacConkey agar, E.coli colonies
microscope picture Gram-negative rods

Escherichia coli

Escherichia coli cultivated on MacConkey agar. Lactose positive colonies. Cultivation 24 hours in an aerobic atmosphere, 37°C.

Escherichia coli is the most common cause of urinary tract infections. Uropathogenic E. coli (UPEC) is responsible for approximately 90% of urinary tract infections (UTI) seen in individuals with ordinary anatomy. In ascending infections, fecal bacteria colonize the urethra and spread up the urinary tract to the bladder as well as to the kidneys (causing pyelonephritis), or the prostate in males. Because women have a shorter urethra than men, they are 14-times more likely to suffer from an ascending UTI.
Text: Wikipedia
Gram-negative, motile, rod-shaped bacterium.