"AI Overview

How Often Should You Wash Your Office Coffee Mug? Never ...

An unwashed coffee cup can harbor a significant number of bacteria, with studies showing that a high percentage of mugs are contaminated with germs of various types, including those linked to colds, flu, and even diarrhea. The number of bacteria can vary greatly depending on factors like how often the cup is used, who else might use it, and how it's cleaned.

Here's a more detailed look:

Contamination is common:
Studies have found that a large proportion of coffee mugs, even those used only by one person, are contaminated with bacteria.

Potential for illness:
Some of these bacteria can be harmful, potentially leading to illness, especially if someone is immunocompromised.

Source of contamination:
Bacteria can be transferred to the cup from hands, other surfaces, and even from residual liquids left in the cup.

Regular washing is key:
Washing the cup with hot, soapy water after each use, and drying it properly, can help minimize the risk of bacterial contamination.

Shared mugs pose a higher risk:
If a cup is shared with others, the risk of contamination increases, especially if proper cleaning procedures are not followed."