Delusional infestation is one type of manifestation of Delusional Disorder. I experienced it in 2012, when I began believing that I had intestinal parasites. I became quasi-obsessed with colon cleansing, thanks in part to Dr. Schulze. I didn’t stop believing that I had intestinal parasites, despite the medical tests that showed that I didn’t have any infestation, until after my Delusional Disorder diagnosis. I continue to self-treat with natural remedies such as ginger and garlic to prevent such an infestation, just in case. No harm in that, right?