So we have another account of worms without any evidence...... next time someone passes a worm, please take pictures, or even better take it to a vet or some elsewhere they can have it tested.
If indeed it where a tape worm and it passed through the body, then it would be evidence for the view that parasitic infestation has difficulty taking hold where conditions aren't suited for it.
Parasites are real, in fact I have blood parasites living in me right now, that I have had for well over a decade, probably picked up from a tick bite, and because of my past heath issues my immune system was unable to clear them from the body. In my experience the best way to deal with possible parasite issues is to build, nourish and strengthen the body at the cellular level through optimizing the diet and lifestyle. Cooking everything, sterilizing everything, and avoiding all germs or worms is not an option. The people who try to do so, usually make themselves sick, because they never develop natural immunity to, or mutuality with, the lifeforms which share this world.
Parasites are not the original issue with most people who become infested. Case by case if you where to visit with those people who have become ill from parasite infections you will probably find a number of other environmental factors involved which allowed the parasite to gain hold in the body to begin with.
Statistics are bulkshit that leave out all the really relevant info.....example- 40,000 Americans die of complications from the flu virus every year, yet I doubt many of us here on this forum are lying awake in fear of the upcoming flu season. The people who die of the flu , like those who become ill with parasites are typically unhealthy due to other issues. What modern medicine has diagnosed as an infectious disease organism is more often a symptom of another condition.