Celiac disease can't be prevented.
If you already have celiac disease, you can prevent symptoms—and damage to your small intestine—by eating a gluten-free diet.
Celiac Disease: Eating a Gluten-Free Diet
Some adults with celiac disease have a poorly functioning or nonfunctional spleen, which is a risk factor for developing a pneumococcal infection. For this reason, your doctor may recommend that you get immunized with the pneumococcal vaccine.