A conversation with my (real or imagined?) Parasite

Oh Parasite! Reveal thyself!
I know you are in there you sneaky amoeboid
Slyly skirting the microscope's probing eye
Slithering into the oblivion of muddy latrines

Oh Parasite! Give me some peace!
I plead with you as my stomach bulges
And my guts squish and groan apocalyptically
Can't we work out a deal? You take some you give some?

"But that goes against my nature"
You say as you suck on those succulent nutrients
That I selflessly provide al gusto suyo
"Just keep it coming and no one will get hurt"

Oh Parasite! Depart thyself!
I threaten as my hand reaches weakly for the phone
And the med office is dialed once again
My cry is desperate: Will you ever be gone for good?