Work on a single bacterium could easily consume a year.

A single bacterium-theearliest form of life-hastwo thousand enzymes.

A single bacterium would be enough, I heard.

Results: Decubitus ulcers are shown to be polymicrobial in nature with no single bacterium exclusively colonizing the wounds.

And from a single bacterium in the soil excavated by the Queen, millions could proliferate on any ant tissue left unprotected.

At such a rate, a single bacterium could theoretically produce more offspring in two days than there are protons in the universe.