I'm deathly afraid of anything worm-like: earthworms, maggots, ant larvae, catterpillars, leeches, and parasites.
One time, I came across a pile of maggots in front of my neighbor's garage. I didn't scream - I couldn't scream, since fear had closed up my throat. I just stared...
That's the official word for the phobia.
Everytime I see a worm on the footpath, usually after it has been raining, I just think "EWW", then I get anxious, and start nervously looking around on the floor, treading carefully and me feet start to feel really tingly.