Answer:
-They do not use live viruses
-The vaccine with mRNA never enter the nucleus
-The vaccine ilicits an immune response
-The cell breaks down the mRNA after it delivers its instructions.
Step-by-step explanation:
mRNA vaccines are a new class of vaccine which can be used to fight against infectious pathogens such as, for example, viruses. These vaccines are based on the design of a messenger RNA (mRNA) sequence that is introduced into de body to encode a protein of the pathogen (or even just a fragment of a protein) and consequently elicits an immune response after infection. Since pathogens need to produce many different proteins to be harmful to the host organism, a single mRNA molecule of the pathogen can trigger an immune response but does not cause the disease. mRNA vaccines don't enter into the nucleus of the cells and therefore they never interact with DNA. mRNA vaccines don't need viral vectors (e.g., adenoviruses) to be introduced inside the body. Moreover, traditional vaccines are those that use inactivated versions of the pathogen in order to trigger immune responses.