Immunity And Vaccinations Flashcards

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1
Q

What is a vaccination?

A

Introduction of appropriate disease antigens into the body

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2
Q

What types of disease antigens are in vaccines?

A
  • dead form of microorganism
  • attenuated (harmless version)
  • antigen
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3
Q

What is antigenic variability?

A

Change of surface protein by microorganisms in order to try and evade the immune system

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4
Q

Why do vaccines need to be modified yearly?

A

Antigenic variability- so mutated microorganism doesn’t evade immune system

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5
Q

What is the success of the vaccination (smallpox) due to?

A
  • stable virus (same antigen)
  • live vaccine (similar)
  • vaccine freeze dried (global distribution)
  • symptoms of disease obvious
  • easy administration of vaccine
  • doesn’t infect animals
  • villagers teach themselves
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6
Q

What is herd immunity?

A

Resistance to spread of contagious disease within a population that results in a sufficiently high proportion of individuals immune to disease especially through vaccination

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