I have four black Australorp hens that are 20 wks. Over the past two weeks two of them have developed a sneeze with alot of caked up snot on the beak. I was positioning one of them in my arms to give an injection of Tylan and while searching for a good spot to give the shot in the breast I saw a worm of some kind moving under the skin. It was red and thin, it looked like a vein but it was moving. I had to do a double take and watch it for a few minutes. It is definately a worm. What type is this and could it be causing the trouble they have been having?