To the eyes of a god, mankind must appear as a species of bacteria which multiply and become progressively virulent whenever they find themselves in a congenial culture, and whose activity diminishes until they disappear completely as soon as proper measures are taken to sterilize them.
— Aleister Crowley

Think of the earth as a living organism that is being attacked by billions of bacteria whose numbers double every forty years. Either the host dies, or the virus dies, or both die.
Gore Vidal bacteria quote

[Bacteria] have an incredibly complicated chemical lexicon that ... allows bacteria to be multicellular. In the spirit of TED they're doing things together because it makes a difference.
— Bonnie Bassler

DNA ties us all together; we share ancestry with barracuda and bacteria and mushrooms, if you go far enough back.
— Spencer Wells

Salad bars are like a restaurant's lungs. They soak up the impurities and bacteria in the environment, leaving you with much cleaner air to enjoy.
— bacteria quotation by Doug Coupland