One sick person can affect 1/3 of your office staff just by touching a door handle, refrigerator handle or cabinet handle.  One sure way to kill germs is by wiping down door handles, phones and desks including the mouse to your computer with disinfecting wipes.  If you regularly wipe down the countertops, tabletops, and coffee pot handles of the break room it will greatly reduce the number of viruses in the office.  Consult your family practice doctor if you find yourself getting sick.