In order to prevent others from getting sick, you need to track down all of the animals that traveled with the prairie dogs to see if other animals are sick as well. After much work, you're able to find each of the animals. Interestingly enough, you find that one of the Gambian giant rats from the shipment on April 23 died a few days after it arrived at the pet store.
Since the Gambian giant rats were imported from Ghana, you suspect that they may have infected the prairie dogs during the transport. But, there's no way to know for sure until you track the Gambian giant rats back to Africa