I am going to echo those above. I just enjoyed some nice Italian sub for lunch yesterday and have probably had over a hundred lunch meat sandwiches throughout this pregnancy alone. I've never in my life contracted listeriosis. The practice I use (the largest OBGYN facility in my area) has never had a patient contract listeriosis during pregnancy. They've been open for over 40 years. I'm not all that worried about it. Our last listeria outbreaks in America were caused by raw cheese, packaged salads (this was a big one), frozen packaged vegetables, even fresh apples!
I stay safer by choosing delis I trust to provide only fresh meat, or I use packaged meat from good brands like Applegate and eat the meat the day I open the package and the next day, and that's it. I like a nice, thick sandwich anyway and finish the package in 2 sittings. Haha. I've never gotten sick from a deli sandwich, but I have gotten sick from e.Coli in a cheeseburger at Wendy's. During this pregnancy. That was not fun!!!