Lou, my understanding also is that it is VERY uncommon - I read a British preg book that suggested something like 25 cases all up reported in about 5 years, only a handful of those reported in pregnancy and of those only 2 that were related to miscarriage - that's in a population of 50 million.. relax! (easier said than done, cos I still keep turning my nose up at some things, even though I know damn well it's safe! LOL!)