Question

Vaccination offers protection against future exposure to pathogens because it _______. A. stimulates the complement system B. triggers clonal expansion of lymphocytes C. promotes inflammation D. enhances the activity of macrophages

Answer 1

Vaccination offers protection against future exposure to pathogens because it triggers clonal expansion of lymphocytes

Importance of alive and dead vaccines

Infectious agents (viruses or bacteria) whose virulence has been reduced by a series of treatments are used in live attenuated vaccines.

• One way is to culture the virus for which a vaccine is being created on cells of another species for an extended length of time.
• This causes it to replicate less efficiently in humans while maintaining its immunizing impact.
• This process was used to create the OPV.

Following vaccination or spontaneous infection, the pathogen causes lymphocyte proliferation that recognizes its antigens and forms a long-lasting immunological "memory."

• When the pathogen resurfaces, these cells respond by neutralizing it before it causes harm to the body.
• Subunit vaccinations, unlike live attenuated vaccines, do not include living components and are thus deemed safe for at-risk patients

Hence, the correct answer is option B

Learn more about live attenuated vaccines here,

brainly.com/question/13051586

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