these types of "Fluke" was the reason for a thorough parasite cleanse that I did afterwards. I gained 5 kg weight spontaneously afterwards, which is quite estonishing because I am a meager type.
Only then it came upon me that those flukes could easily have been grapefruit cells.
Next time I will put the juice through a sieve so I can be sure. And for you I would recommend to do a precise test if these are really flukes. Since they, if cells, have been in the GI tract so long, their content may have been replaced against something preveilant in the GI tract. That is no evidence for me.
But of course, if the juice was fine filtered, no such big cells from a grapefruit could have entered.