I bet the gorillas got it from the food their handlers touched (or sneezed on). But my wife still has contacts at the zoo and Wild Animal Park. She tells me the gorillas got over it quickly, like a common cold. Other species may get it, but the only one I would worry about is domestic cats. Most other species either are solitary (meaning they don't spread it) or don't have much contact with humans (meaning they don't give it to us).

Isolation to prevent spread is another great reason to keep your pet cat inside. They could pick it up from another outdoor cat, and kill your grandmother. Pet ferrets, too.