A tortoise may be a carrier but show no outward signs of the disease. URTD is easily transmitted to other tortoises. The need for minerals may be the reason that wild tortoises in some areas eat soil and pebbles. Pet tortoises do this too. This does not necessarily cause problems, but in pet tortoises impactions have been associated with eating pebbles.
Intestinal parasites are a hidden problem.
Have your tortoise checked by a vet. Tortoise Group can provide you with a list of veterinarians experienced with tortoises. Washing hands after handling can prevent spread of any Salmonella to you and small children who tend to put their fingers in their mouths. Tortoise shell was sometimes powdered and used to relieve stomach and urinary tract problems among the Yavapai indians.