CMV is well heard of in childcare -so I can only speak from what we are advised - as it is mainly contracted from children under the age of 2 years. You can be tested prior to pregnancy (or during) to know if you are immune of not (if you have come in contact with it in your life before - most childcare workers have been).
In our industry we are instructed not to work with children under 2 if we are not immune - it is contracted from faeces, urine and saliva. They recommend careful hygeine - using gloves when changing nappies, etc and washing hands well.
I've heard of one case in childcare where someone did have a baby affected by it and she sued her employers successfully.