wild mice with live fat worms

Question
I live in a wooded area and at this time of the year I get a variety of wild mice trying to live in my 132 year old house.  It's kind of hard to keep them out.  In the past few days I have killed by traps, several, but I noticed in the last two rounds of dead mice, the seem to be leaving some sort of fat black oval shaped worm, something like a grub worm.  The worm seems to be smooth on the top and the bottom has rippled ridges, rather wide, maybe about 7 ridges running side to side from front to back.  I would say, if they are being expelled from the dead mice, that they are rather large for the tiny creatures.  They measure about 3/4 inches long and 1/2 inches round- top to bottom-side to side.  These beasties are still alive and moving, but they can't seem to get anywhere.  I've never seen anything like this and  it is very  alarming.  Can you tell me what this is?  Is it dangerous?

Answer
Dear Lynn,

In my over 1600 questions I have often found that I will get a completely new issue and suddenly three people will write about it independently within a week. But I did NOT expect this one. A few days ago a girl sent me a photo of a baby wild mouse with what looked like a filthy abscess on its rear.  Before she could give it the warm baths I was recommending, she found the mouse looking good and the parasite sitting there looking disgusting. I cant believe I'm getting another letter about them!

Anyway it means I can answer your question of how they attach to the mouse. They simply burrow in. Here is the original question with the photo:

http://en.allexperts.com/q/Mice-3824/2011/9/house-mouse-large-opening.htm

The person who found that is trying to find out what they are. I am going to ask a few vet and wildlife Facebook friends about them. To tell the truth I am pretty grossed out about the whole thing, but, mouse issues are mouse issues and they are all important!!

Please let me know if you find anything out, and I will do the same for you. As for them being dangerous to people... wow I hope not! I will try to find that out too.

In the meantime, could you describe what condition the mice were in?




UPDATE 1: My other questioner found out it is the larva of the Rodent Bot Fly.
UPDATE 2:  Apparently they are edible, so I don't think you have to worry. I'm not sure how to cook them, though...


Thanks so much.

squeaks,

Natasha