It's quite the opposite. I have been told that I do not have IBS nor Crohn's, it is an imbalance of some sort, possibly the fruit juice fermenting in the gut which would explain the rashes and other symptoms and my muscle spasms are a lack of minerals and I have done numerous comprehensive stool analysis tests, colon mucosa analysis and blood tests with reputable laboratories and all have come back negative for parasites.
It seems like a common theme on these forums for some people to insist that every person has parasites and they are to blame for every unexplained condition.
Crohn's is quite real, just ask 4 of my colleagues who's loved ones are battling it. None of them have parasites.
Some things you can not explain and are often a result of genetics or poor health habits.