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Although vaccines cannot be used to treat a person who is sick, they can help to prevent infections. Vaccinations tell the body to create "memory cells," which will function later to create antibodies against certain pathogens.

When a person is vaccinated, what are they injected with?

A. Antibodies to a disease bacterium.
B. Weakened viruses or antigens from the virus.
C. Live, inactive viruses.
D. Blood from a person who has had the disease.

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Final answer:

Vaccines introduce weakened pathogens to stimulate immune responses and create long-term immunity. Immunization provokes immune responses without causing sickness, resulting in protection against various diseases. Memory cells store antigen information, enabling quick and robust immune responses upon re-exposure to pathogens.


Explanation:

Vaccines work by introducing weakened forms of pathogens or their products to stimulate the production of protective antibodies or T cells without causing the disease. For example, the Pfizer-BioNTech and Moderna COVID-19 vaccines consist of a piece of the virus's genetic material (mRNA).

Through immunization, the body is deliberately exposed to a pathogen to provoke an immune response and memory cell formation. This process establishes long-term immunity against diseases like measles, mumps, and chicken pox.

Memory cells play a crucial role in vaccination by storing information about specific antigens, allowing the immune system to mount a faster and stronger response upon re-exposure to the pathogen.


Learn more about Vaccination here:

https://brainly.com/question/47941435


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