This is true. Computer keyboard are one of so many. There was a question before that say's....what is the dirtiest part of your house. 90 percent said, the toilet, wrong...our toilet we cleaned it everyday and we used a dissenfectant to kill bacteria. The correct answer is the kitchen since this where we do our food, and bacteria are attractable to food. Sure we've cleaned our kitchen but we cannot eliminate every bacteria that come from vegetable, meat, fruit, utensil, chopping board, knife, table top and many more.