In 1982, the first recombinant DNA vaccine for livestock was developed. An advantage of the vaccines made through recombinant DNA technology is that they use only a small portion of the original microbe. Conventional vaccines use killed or weakened forms of the disease-causing microbe.</>

Disease-causing genes are not included in the genetically engineered vaccines. Therefore, the recombinant vaccines build up the body’s immunity without the risk of causing disease. They can be developed at a higher speed as compared to conventional vaccines, the development of which can take 20 to 30 years.