Sure it wasn't a small bird (size of a sparrow with bird like feet and claws) that somehow got into the leg of your pants and in it's panic to be free it stabbed you with its beak. Birds carry all sorts of disease which could account for your fever

On 07/10/2016 at 0:00 PM, nikmar said:

Tarantula hawk wasp.

 

Not sure if its what your looking for but i got the heeby jeebies big time.

These things are right up there with Bullet Ants as the most painful stings on the Planet Earth!