I was really vigilant with listeria risk with first pregnancy and pretty careful with this one - till I visited MoVida in Melbourne and ate raw, air-dried wagyu beef, runny truffled eggs and spanish jamon (cured meat). Within hours I got the panics and started worrying about it, but the risks are really low, even if you do dumb stuff like I did. There is a good article on BB about it somewhere, and the health dept stats will show you the incidence is REALLY low.