I've see this before. I think it is fluke poop. The poop is contained in a membrane, which the body attacks, covering it with mucus.
I have pics on my website. They are in tiny little beads if you look really close.
It is very distinct under the microscope.
When I completed my parasite meds, I passed a parasite that actually bled red blood cells. I have not seen these things since. Shroom