Image 1: Frozen cross-sectional slices of neutered male piglet (body live weight=5.9 kg), vaccinated with Circovac spiked with black ink and NFID Valery. (Lower left: first rostral slice; lower right: second slice-injection site; upper right: third caudal slice). (Original image, flatbed scanner settings: 1200 dpi; 10200X14040 pixel, Jpeg).