There are several types of vaccines, each with unique characteristics and mechanisms of action:
Live-attenuated vaccines: Contain weakened pathogens that can replicate but do not cause disease. Inactivated vaccines: Contain killed pathogens that cannot replicate. Subunit vaccines: Include only parts of the pathogen, such as proteins or polysaccharides. Toxoid vaccines: Contain inactivated toxins produced by the pathogen. mRNA vaccines: Use messenger RNA to instruct cells to produce a protein that elicits an immune response. Viral vector vaccines: Use a harmless virus to deliver genetic material from the pathogen to cells.
