Due to the scale and rapid development of farming, global food demand has shifted away from the pursuit of quality to demand for quantity. However, this is starting to change as consumers begin to pay more attention to food safety and demand the quality they deserve. 
Traditional breeding creates a variety of externalities and uncertainties such as frequent epidemics, antibiotics abuse and environmental pollution. Therefore it is imperative that industry enterprises step in and contribute new solutions to each link of livestock production—animal vaccines are a critical link.