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IIRC listeria lives in the soil, so can be found on unwashed raw fruits and vegetables, and also in animals that we use for food. But because it is so readily destroyed by cooking, the main culprits are ready-to-eat foods that are contaminated after they are cooked/pasteurized but before they are packaged.
That's a lot of food. >

I'm the "FDA compliance guy" where I work, we make batteries for medical devices.
When I saw the full list of recalled products linked by /u/AudibleNod I just about fell out of my chair.  That's going to be a nightmare to manage.
I wonder how so much product got out the door before the Quality Manager got tipped off.  I'd imagine samples from each manufacturing lot would be tested and the shipments quarantined until cleared.
The FDA works backwards from many other countries, it's almost an honor system.  You are expected to be in full compliance at all times, and if the FDA visits for a surprise inspection your facility and records better be in order.  Otherwise you get major fines and possibly shut down.
We sell into Canada which requires an ISO certification BEFORE we can sell anything into the Canadian market.  I believe that's the smarter way to go.
At least for medical devices, the FDA is on the way to harmonizing with most ISO standards.  They don't officially recognize ISO officially, but if a facility has a certification then the FDA won't conduct surprise inspection - only if there has been a complaint/injury/death. >

These seem to be prepackaged meals more than anything, correct?