They don’t live in the stomach, but the colon.
I’ve read about the tape test, and understood it to work as follows: you apply the tape before going to sleep, then settle down for the night. The little beasties come out right on cue and get stuck to the tape, and you just harvest your “catch” in the morning. So you can do this all by yourself, with no help needed from a passing stranger. 
If you want to sound fancy, the scientific name for pinworm is Enterobius vermicularis.
I don’t think an infection would just die out on it’s own too easily. Each female worm can produce up to 10,000 eggs and it only takes a few hours for the eggs to mature to the juvenile worm stage. So when the adults die after producing eggs there’ll be plenty of little ones to take their place.
I’m not sure what the latin for misplaced apostrophe is.
And risk an explosion? No thanks.
No, but you have to re-eat the eggs (gag-gag) don’t you?
Pardon me while I go vomit…
I can see Sean Connery doing a commercial for pinworm shields. “Stop those pesky pinworms while you sleep. Use Anal Bum Covers and you’ll never be itchy again. Ask for them by name.”
Well… yeah, but they’re microscopic. You’ll never notice.
<newt> “They mostly come at night. Mostly.” </newt>
My butt itches now.
I did a Staff Report on this subject that ran about three years ago. And if I’m gonna be bothered to actually do a Staff Report, by god, everyone is gonna READ that sucker. It will answer most of your pinworm questions. I was merciful, though, and did NOT link to any pinworm pictures.
geep.
Bleach enema, immediately.
Lieu should be along shortly to impart knowledge in his own special way.
The problem is, usually the ingestion occurs while sleeping. Not much you can do about that, really.
Weah, wut wu wotta weep 'em waurm…"
spits a dozen pinworms into hand… coughs
Yeah, but you gotta keep 'em warm.
puts 'em back in mouth… casts…
ZIIIiiiiiiiiiirrrrrrraaaaa… Weah Waby!
I should add that pinworms are hardly the creepiest parasite a human can suffer. You want weird and disturbing, check out Guinea worm.
Wait, if everyone has them living in their colon, what’s the point of doing the test? And I get the cycle, but how does it start? Where do the pinworms come from to begin with?
How is that possible?
I don’t even really want to know, but yet I am compelled to ask …
After the medication, do they come out ALL AT ONCE?
Ah, the joys of the wormy parasites. Back when I was a lab tech, we had a formaldehyde jar filled with a tapeworm from some patient - it was a gallon jar, and it was full of worm. One worm.
(Just for the record, I think Butt Loungers would make a great band name.)
Apparently, roundworms are good for fighting allergies. I dunno if pinworms apply.
If they find out that guinea worms are good for arthritis, I’m simply going to live with swollen joints in later years, though. Unless they can be trained to do tricks, like slither out of your leg blisters to fetch your slippers and such. Then I’d consider it.
Well, to be blunt, while you’re asleep, you scratch your ass, then scratch your mouth. Your sleeping self is a damn slob!