Wheat gluten is used in quite a few dry foods, so you can bet the contamination is gonna spread to other brands, too.
Even worse, the FDA has found a different toxin - melamine, a plastic - than was identified by the original lab (a rat poison). My guess is that BOTH substances have contaminated the wheat gluten at different times . . . One other possibility - the wheat gluten isn't the only contaminated substance contained in these cat foods.
I'll bet this has been happening off and on for quite some time too, and has just now been detected.
That's what you get for feeding cats grains, which aren't part of their natural diet, anyhow. Cats are carnivores. Feed them MEAT. They aren't setup to handle the carbohydrates and plant toxins found naturally in grains, let alone pesticides, fertilizers and other manufactured chemical residues found on cheap grains imported from China.
It is a little outrageous that Menu Foods, which controls the manufacture of something like 80% of all the canned food in North America, can't be bothered to systematically test their ingredients for contaminants. You'd think with those kind of economies of scale, routine testing would be performed as a matter of course. It's not like it would add more than a penny a can to the cost of their product (if that much).