10.1.7

Vaccination & Immunity

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Vaccination

Vaccination is the main technique for helping the immune system recognise and destroy pathogens. Immunising (making immune) a large proportion of the population will make it very hard for a pathogen to be spread. The process of vaccination is:

Inject a dead pathogen

Inject a dead pathogen

  • A vaccination injects a dead or inactive form of a pathogen into the blood.
Immune system recognition

Immune system recognition

  • White blood cells recognise that the antigens are foreign and produce antibodies against them.
Memory cells

Memory cells

  • Some of these white blood cells called memory lymphocytes remain in the blood as memory cells. If the same pathogen invades the body again, the memory lymphocytes can:
    • Produce antibodies faster.
    • Produce more antibodies. This means that the antibody concentration remains in the blood for longer.
Immunity

Immunity

  • Next time the same pathogen infects the vaccinated person, the immune system will destroy it before it can cause illness.
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Classification of Living Organisms

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Organisation of the Organism

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Movement Into & Out of Cells

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Biological Molecules

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Enzymes

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Human Nutrition

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Diseases & Immunity

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Gas Exchange in Humans

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Excretion in Humans

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Coordination & Response

15

Drugs

16

Reproduction

17

Inheritance

18

Variation & Selection

19

Organisms & Their Environment

20

Human Influence on Ecosystems

21

Biotechnology & Genetic Modification

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