Recently a student came into the lab and wanted to work with our microbiology department to see which type of money had the most bacteria on it. The answer: “The $1.00 bill” Coins had some but not near the level as a dollar bill.
A similar article “How Much Dirt and Bacteria is on Money” highlighted these same facts. We always tell our kids and workers to wash their hands after going to the bathroom or after you have been in a public place. How many times do we ask cashiers if they have washed their hands. You may think twice when receiving your change.