Answer:
Recombinant DNA vaccines are produced by
using genetically engineered plasmids that have gene inserts possessing the
surface proteins of a pathogen. After the binding of pathogens to these surface
proteins, a weak immune response is elicited but it do not results in
infection.
These plasmids are inserted in bacteria
or yeast cells that expresses the viral proteins, which are then injected into
the human host as vaccine, where they are recognized as foreign and an immune
response is elicited.
Recombinant hepatitis-B vaccine
and polio vaccine are the examples.
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