Comment by CodeWriter23

I don't know what their QA looks like but I don't think it's too big a stretch to think they retain samples of every batch and culture for such pathogens. Just to have the ammo to fight back.

It is entirely possible mishandling could cause this. Like the many times I've gotten home from Trader Joe's to find the 'associate' unpacking the box sliced the product package open with their box cutter.