Wash your hands and use hand sanitizer to ensure that germs are not on your hands. Think about it next time you turn a door knob, hold the door for someone else, pick up the sugar to add to your coffee, use a public phone or whenever you're around other people. If you're not near a restroom use hand sanitizer to ensure you're not carrying around any germs.
Also, clean your work area. Most people spend most of their time at work, so make sure that you disinfect your area and it stays clean.
Use a Humidifer and/or Saline Nasal Spray»