Introduction
You take blood samples and nasal swabs from all affected horses and look to the pasture for any other clues, looking for any toxic plants or trees. You also take several samples from hay bales stored in the barn.
As you begin the necropsy on the dead mare using extra safety precautions, something in the back of you mind rings a warning bell
Your findings include severe pulmonary edema and congestion with bloodstained froth in the airways. Subcutaneous edema is present around the face, lips, and neck. Take several samples from lungs, kidneys, liver, intestine, brain, and mares fetus.