Hey, I grew up on a farm with more than a dozen cats always around.
It doesn't mean that either you or I haven't been affected over the years.
Once infected, you are always infected. But our T-cells keep it at bay through most of our years.
I understand that in France, 85% of the population tests positive for T. Gondii. Read the Wikipedia reference on it.
http://en.wikipedia.org/wiki/Toxoplasmosis