Figure 1. A) Nursery piglets showing clinical signs compatible with porcine hemagglutinating encephalomyelitis coronavirus (PHE-CoV). Nonaffected pigs of the same age are also shown. B) Muscle layer of stomach from affected piglet showing perivascular cuffing (arrow); hematoxylin-eosin stain, magnification ×100. C) Brainstem from affected piglet showing satellitosis (arrows) and gliosis; hematoxylin-eosin stain, magnification x400. D) Brainstem from affected piglet showing positive label of neuron perikarion (arrows); nitroblue-tetrazolium imunohistochemical stain, magnification x400.