The Thing About Bot Flies...
They are too large to land on hosts and transfer their larvae. Instead, they catch unsuspecting smaller flying insects and attach their larvae to them. Then they let the unsuspecting smaller flying insect loose. The unsuspecting smaller flying insect flits around carefree and happy, lands on an animal, and the bot fly larva drops onto its new host. The larva burrows deep into the animal's skin, eating the animal's "meat", until it is fully grown and drops from the host animal.
If that host animal happens to be human, then the only thing to do is suffocate the larva and pull it out. It's a nasty process. Just remember that it is always easier (and less nasty) to prevent bot fly larvae from infecting you in the first place. If you do become infected, it is best to take immediate action before the larva has time to feast on your "meat" and grow.
For those who still don't get it, here is the bot fly...
Here is the larva:
Inside Hillary Clintons Secret Takeover of the DNC https://www.politico.com/magazine/story/2017/11/02/clinton-brazile-hacks-2016-215774
And here is poor old DU
Meanwhile, the bot fly who planted the larva is super happy: