Mostly anecdotal stories I have heard over the years in person and over the internet, people eating tons of greens, sprouts, highly alkalinizing foods etc and then passing tapeworms. it has to be a high quantity though.
How do you know it was not the toxic oxalic acid (beet greens, kale, spinach, etc.) found in some greens that was not what was getting rid of the worms if the story is true?