Hello,
Parasites are generally not going to kill a reptile quickly, unless the levels have been chronically high & the reptile is already ill from malnutrition, etc.
Most of the time, reptiles carry a very low level of parasites & worms as their normal intestinal flora which is necessary for healthy digestion.
If your dragon begins to show symptoms of lethargic behavior, loss of appetite & or energy & having runny or smelly stools, it is a good idea to get a fecal sample done to check the levels of parasites & worms.
Just keep everything clean & most of the time, your dragon should not get excessively high levels of parasites or worms. Remember that feeders, namely dirty crickets can carry pinworms or other parasites so make sure your feeders are clean. Don't keep dirty water in the tank, as well which harbors bacteria.
Tracie