Bacteria

Bacteria were single-celled lifeforms.

Known species of bacteria included staphylococcus (TAS episode & novelization: The Infinite Vulcan) and streptococcus. (TOS novel: The Rise and Fall of Khan Noonien Singh, Volume 1)

Unlike viruses, bacteria were easy to see under a microscope and fairly easy to kill. (TLE novel: Catalyst of Sorrows)

Volition was a S'ti'ach game involving competitions between fast-breeding bacteria. (TTN novel: Sword of Damocles)

In 1999, the Melacron learned how to turn common bacteria into cures for a variety of diseases. (TNG - Double Helix novel: The First Virtue)

In 2266, Spock noted that a shrunken Montgomery Scott at microscopic size would be menaced by airborne bacteria. (TOS comic: "Dwarf Planet")

In 2267, James T. Kirk reflected that bacteria had more respect for privacy than Leonard McCoy did. (TOS novel: Final Frontier)

By 2376, grasses, microbes and bacteria were the only lifeforms on Banea. (VOY - Dark Matters novel: Ghost Dance)

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