The objective of this study was to develop a plant based product that can be fed to pigs to help induce the immune system to combat PRRSV. The GP5 neutralizing epitope and CTB were the parts of the plants that the researchers want to extract. It was found that  plant-produced CTB-GP5NE could efficiently bind to the mucosal GM1 acceptor, demonstrating it is biologically active. Taken together these results prove that CTB-GP5NE is an excellent candidate for oral vaccine against PRRSV. The researches state that the system to extract the plant products must be improved it if were to be introduced at a commercial level.