Which among the following statements does not characterise Escherichia coli (E. coli)?

E. coli and other facultative anaerobes constitute about 0.1% of gut flora.

E. coli is a gram-negative, facultatively aerobic, rod-shaped bacterium.

E. coli is a very versatile host for the production of heterologous proteins.

E. coli was one of the first organisms to have its genome sequenced.

E. coli normally colonises an infant's gastrointestinal tract within 40 hours of birth.