Interesting... wonder if it’s a distribution thing. It was when Diamond had their problem last year, it was all their food East of the Rockies.
I suspect that just given normal product distribution patterns, the contaminated food did end up clustered in a few areas. This would explain why most vets are reporting no increase at all in kidney failure cases, while a few are reporting a major increase.
NYC’s Animal Medical Center, a big teaching/research hospital that gets referral cases from all over the region, scrutinized the test results of 143 pets they treated for renal failure between March 17-20, and found only 5% to be related to contaminated food.
http://www.amcny.org/foodrecall/renalfailure.pdf