Here's a pretty good video about the problem in general. https://youtu.be/nyG-np0S0ZQ
The jist is that a lot of this is from consolidation at all levels. There are fewer grocery stores and distributors which has ultimately made hard to know where food ultimately comes from.
Couple that with deregulation and the dismantling of the government regulatory agencies under DOGE and we get what we have.
It's harder for casual shopper to know where their food comes from. But having worked in food production facilities that couldn't be further from the truth. You'd be surprised how meticulously tracked every part of the, supply chain is. down to the specific row in a field where something is picked.
(That's what makes this recent outbreak so atypical - either there was a massive screw up or someone is hiding something).
People also are not aware that the US has (or at least had) one of the most meticulous food inspection regimes in the world. Agency inspectors actually drop in and inspect facilities regularly. The EU might have more stringent food regulations, but as a reminder people were able to slip horse meat into the beef supply for decades before being caught - something like that would be inconceivable in the US.