E. S. Williams,¹ V. M. Becerra,¹ E. T. Thome,² T. J. Graham,³ M. J. Owens,¹ C. E. Nunamaker<sup>4

1</sup>Wyoming State Veterinary Laboratory, University of Wyoming, Box 950, Laramie, Wyoming 82070, USA
²Wyoming Game and Fish Department, Research Laboratory, University Station, Box 3312, Laramie, Wyoming 82071, USA
³Box 478, Basin, Wyoming 82410, USA
⁴Plant Science Division, University of Wyoming, Laramie, Wyoming 82071, USA