It's also not actually sound to begin with. MERS was transmitted to humans from camels, which are not exotic at all in the middle east. Livestock frequently interacts with wild animals, and this isn't really preventable, especially against bats. Worse yet, livestock is generally kept in large groups in close proximity to each other, and once slaughtered is distributed quickly and widely. While it doesn't get the same media coverage, it is not that uncommon for diseased meat to make it into the food supply. While meat inspection practices go a long way to help, they for obvious reasons have a hard time dealing with new diseases.