Numerous bacterial species are adept at roughing it out. Some live in boiling hydrothermal vents, deep under the Earth’s crust, and some even inhabit cold tundra. However, if you ask most germs where they would most want to reside, they’d probably choose a kitchen sponge.
It turns out that the very instrument we use to clean our glasses and plates is teeming with microorganisms. The bacterial paradise is a sponge. They are moist, warm, and brimming with wholesome food particles for the microorganisms to consume.
New information on the bacterial microbiome of old kitchen sponges was released in 2017 by Markus Egert, a scientist from Furtwangen University in Germany. In those sponges, he found an astounding 362 types of bacteria.