DNA vaccines are a type of third-generation vaccine. They work by using a copy of DNA to trigger an immune response

Pros of DNA vaccines: 

• The ability to effectively stimulate different dimensions of the immune response, which provides longer-lasting immunity with fewer doses
• After testing for effectiveness and safety, they can be generated in large volumes at a much lower cost, making them more cost-effective than many other traditional vaccines
• Absence of live or dead infectious agents in the vaccines
• Lower risk of infection
• The immune response focused on the antigen of interest