They need to be kept cool, so they don’t travel well.Because they contain a small amount of the weakened live virus, some people should talk to their health care provider before receiving them, such as people with weakened immune systems, long-term health problems, or people who’ve had an organ transplant.Just 1 or 2 doses of most live vaccines can give you a lifetime of protection against a germ and the disease it causes.īut live vaccines also have some limitations. Live vaccines use a weakened (or attenuated) form of the germ that causes a disease.īecause these vaccines are so similar to the natural infection that they help prevent, they create a strong and long-lasting immune response. Inactivated vaccines are used to protect against: So you may need several doses over time (booster shots) in order to get ongoing immunity against diseases. Inactivated vaccines usually don’t provide immunity (protection) that’s as strong as live vaccines. Inactivated vaccines use the killed version of the germ that causes a disease. Subunit, recombinant, polysaccharide, and conjugate vaccines. There are several types of vaccines, including:
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