A tiny creature wrapped in slime
A useful little parasite
I'll take your food and drink your wine
I'll ask for more and you'll oblige.
Not a tapeworm. No, not quite.
'Twould be ironic! This is why:
In tapeworms I as well reside.
Now the question: What am I?
Hint 1:
I'm real. I'm not a creature from a fantasy movie or story.