I've never heard of that one before, not even my GP nor obgyn mentioned that, so I'd say it's a myth. Yes cat's poo should be avoided, however it's not as bad as u think. Many cat's have already had 'toxoplasmosis', and so are immune to it, like we get chicken pox. Cats that eat birds & mice are more likely to get it & it grows in their poo, but takes 24hrs to grow, like abs said. If u have an indoor cat then chances are extremely small of ur cat getting it. My obgyn said that even if ur cat does have it, it can only be an issue in the first tri (at least I think that's what he said) & that the chances of me getting it if my cat had it was 3%, but nevertheless, DH has agreed to do the litter tray whilst I'm pg.