I got two problems with this thread title:
- There is no “bad bad bad” to identify the source of the crazy.
- Which is it? “Never”, or “for awhile”. Pick one and stick to it.
As for the thread, Disgusting!
Whatever you do, don’t google Guinea worm.
Mean Mister Fish:
OMG. I messed up with word usage.
I missed that day in Honors English.
I’m sorry I bothered your English Language sensibilities.
I’ll endeavor to do better 
Endeavor to Persevere.
I watch the youtube channel “Mouse Trap Monday”, wherein the host tests out various types of mouse traps while filming the mice getting caught. A fair proportion of the caught mice have big botfly lumps on them; sometimes the lumps are as big as the mice themselves. Yuck.
The Mouse Trap Monday guy, Shawn Woods, lives in western Oregon. So botflies are a thing as far north as that.
Just don’t declare war on the Union, OK?
In Florida? That’s pretty rare. Human botfly doesn’t occur in Florida. There are a few animal botfly species that will very rarely accidentally parasitize humans, sounds like your friend got lucky 
Rearing out a human botfly from your own body is a time-honored tradition amongst entomologists working in tropical areas
Pit-tooey. I reckon…
My friend neglected to tell me they did a daycruise.
I guess she coulda got the botfly larva there.
She says she has a another lump behind her ear.
Not sure, but I think I would go to hospital and not leave til I was totally screened and cleaned.
I’ll bring my own bleach and burning sage.
Yes, and treatment of parasitic infections (including among humans) is its on-label use.
I do believe there have been a few threads on SDMB about fly strike, which vexes sheep and their butts.
But I don’t want to do a search to confirm whether my memory is correct, because it may lead me to find out that my memory is correct and I’d revisit some threads about fly strike.
Which I don’t want to do.
Depending on where the cruise was she could have picked it up. Botflies don’t directly lay eggs on their hosts, the grab another insect like a mosquito and lay the eggs on that; when the mosquito goes to feed on the host the eggs hatch and the larvae drop off and bore in.
Ivermectin or other antiparasitic drugs may kill them, but the larvae still need to be surgically removed or they’ll still be in there causing problems like sepsis.
One of my cats in Washington got them about 15 years ago. It required the vet opening up her back to get all of them. He said they see maybe one case a year here.
Times change as climate changes. Clearly, they are here and it’s just a matter of time until they are endemic.
I kinda hate you, now😳
In 2002 I found a (dead) odd-looking rotund fly, but didn’t know what it was:
On recently reviewing old photos, I took advantage of the spectacularly useful Google Lens and learned that it was a rodent bot fly from the genus Cuterebra
Well, hold on. The cruise theory is still a possibility. And let’s not confuse animal bot flies with human bot flies, as mozchron has pointed out.
But it’s in any case no fun thinking about how Alien wasn’t made up out of whole cloth. If you’re in search of more horrifying nature stuff, look up ichneumon wasps.
Not to be dense, but how does a fly know the difference between Man or Beast?
Or the mosquito carrier, for that matter?
Do they even care?