At an “inorganic farm” of “melon factory” the melons would have been spayed to remove and kill contaminants reducing the chance of this happening. The “organic” farm is far more likely to not use unnatural cleaners and use “natural” fertilizers. They even allow their animals to free range into the melon patch.
I do not believe the problem is the 'farm'. I believe they hired uneducated unsanitary workers who are cheap labor. The melons were contaminated after they were cut into and processed. I grow melons and I always wash them before I ever cut into them. I have yet to find a way to keep out the 'wild' birds, squirrels, rabbits, bugs, worms, flies, etc., from having their free range over my melon patch.
“Under USDA organic standards, manure must be subjected to proper thermophilic composting and allowed to reach a sterilizing temperature. If raw animal manure is used, 120 days must pass before the crop is harvested if the final product comes into direct contact with the soil. For products which do not come into direct contact with soil, 90 days must pass prior to harvest.”