CMV is a fairly serious issue in my line of work - considering the high chance of employees being and/or getting pregnant.
CMV is passed via bodily fluids, majorly poo and wee but sometimes saliva too - so personal hygeine is the major preventative factor. Usually anyone who's had anything to do with changing lots of nappies will have been exposed and therefore immune. Most prevelent in children under 2.
There has only been one gazetted case in my industry where a pregnant worker had a baby affected by CMV. So for someone not in a position where they would be handling bodily fluids from young children on a regular basis, the risks of getting it would be much lower.
I don't know how CMV could be congenital - the V stands for Virus.
My staff considering pregnancy are advised to be tested for CMV immunity prior to getting pregnant. If they are not immune, they cannot have contact with under 2's whilst pregnant.
I think some people are confusing 'congenital' with 'genetic.' Congenital means that you're born with it, so as Lions and Bears says, it could be picked up in utero, or from the birth canal during delivery. Genetic means it's in your genes.
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