What kind of worm is this and what is best dewormer?

[WannaFarm]

I just lost my second chicken this week.

The worm looks a lot like a maggot (fly larvae) to me. The problem is, I don't know if it came out of her, or was on her, because she had been laying in the same spot since last evening.



Thanks is advance.

 

[RoosterAl]

That is a fly maggot.