I have to say that, while I'm no expert on zombie movies (basically, I've seen a handful of the Romero films, the Raimi movies, TWD and various 80s B movies), I've never seen one where zombies are "toxic." Yes, I've seen them bite people and infect them (not unlike rabies) but never seen one where their toxicity is such that insects and other organisms that eat dead rabid animals would be affected. Is there a movie like that?