Answer:
Recombinant DNA vaccines are known as third generation vaccines. These are the purest, highest potency vaccines. These are produced by using genetically engineered plasmids. These plasmids have gene inserts for the surface proteins of a pathogen that can elicit immunity but do not result in infection. After that plasmids are inserted in bacteria or yeast cells where they express the viral proteins. These proteins are injected into the human host as vaccine, where they are recognised as foreign elements and an immune response is elicited. Recombinant DNA vaccine is used for treating diseases such as hepatitis-B, polio, etc.
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