Pregnant women shouldn't eat salads?

"The Weighty Responsibility of Drinking for Two"

The most interesting lines, to me, in this article about drinking during pregnancy are:

Just try to buy unpasteurized cheese in England, or to eat salad in France when you’re pregnant,” wrote a friend living in York, England. (Many French obstetricians warn patients that raw vegetables are risky.)

I hate salads. I had briefly taken up eating them because it is healthy after all. I'm not pregnant, but after reading this I now have an excuse to stop eating them.