AQA · GCSE · Biology
Course version: 8461 · Version from Sept 2018
Students should be able to explain how vaccination will prevent illness in…
Full specification wording
Vaccination: Students should be able to explain how vaccination will prevent illness in an individual, and how the spread of pathogens can be reduced by immunising a large proportion of the population.
Vaccination makes a person immune to a specific pathogen without them suffering the disease.
Checked against the AQA 8461 specification (opens in a new tab) on .
- Point 1 of 3
- 2 key terms
Study notes
From the checked teaching notes for this specification point.
The idea
Vaccination makes a person immune to a specific pathogen without them suffering the disease. A vaccine contains a dead or inactive form of the pathogen, or antigens from it. White blood cells respond by producing antibodies and memory cells. If the live pathogen later enters the body, memory cells recognise its antigens and produce antibodies quickly, so the pathogen is destroyed before it causes illness. This protects the individual. When a large proportion of a population is immunised, the pathogen cannot easily pass from person to person, so the spread of disease is reduced. This protects people who are not vaccinated, including those who cannot be vaccinated for medical reasons. This is sometimes called herd immunity.
What earns the marks
- A vaccine contains a dead or inactive pathogen, or antigens from it, so it does not cause the disease.
- White blood cells respond to the vaccine by producing antibodies and memory cells.
- On later infection, memory cells recognise the pathogen's antigens and produce antibodies quickly.
- The pathogen is destroyed before it can cause illness, so the individual is protected.
- Immunising a large proportion of the population reduces the chance of the pathogen spreading between people.
- Reduced spread protects unvaccinated people, including those who cannot be vaccinated.
Common mistakes and how to put them right
Thinking a vaccine contains a live pathogen that causes the disease.
Put it right: Vaccines contain dead or inactive pathogens or antigens, so they do not cause the disease.
Believing vaccination gives immediate lifelong immunity to all diseases.
Put it right: Immunity develops after the immune response and is specific to the pathogen in the vaccine.
Confusing individual protection with population protection.
Put it right: Vaccination protects the individual, while immunising many people reduces spread and protects the wider population.
Exam tips
- Explain the role of memory cells in the secondary response to show why the person does not become ill.
- Use the phrase 'large proportion of the population' when explaining reduced spread, and link it to fewer opportunities for transmission.
- Distinguish clearly between protecting an individual and protecting a population, as both ideas are required.
Try the lesson
The start of the Vaccination: Students should be able to explain how vaccination will prevent illness in an individual, and how the spread of pathogens can be reduced by immunising a large proportion of the population. lesson, made from checked teaching notes for this specification point.
Have a go first
A person is vaccinated against a pathogen. How does this vaccination prevent the person from becoming ill with that pathogen later?
Listen
Vaccination makes a person immune to a specific pathogen without them suffering the disease. A vaccine contains a dead or inactive form of the pathogen, or antigens from it. White blood cells respond by producing antibodies and memory cells. If the live pathogen later enters the body, memory cells recognise its antigens and produce antibodies quickly, so the pathogen is destroyed before it causes illness. This protects the individual. When a large proportion of a population is immunised, the pathogen cannot easily pass from person to person, so the spread of disease is reduced. This protects people who are not vaccinated, including those who cannot be vaccinated for medical reasons. This is sometimes called herd immunity. A strong answer earns marks for these points. A vaccine contains a dead or inactive pathogen, or antigens from it, so it does not cause the disease. White blood cells respond to the vaccine by producing antibodies and memory cells. On later infection, memory cells recognise the pathogen's antigens and produce antibodies quickly. The pathogen is destroyed before it can cause illness, so the individual is protected. A common slip: Thinking a vaccine contains a live pathogen that causes the disease. Instead, vaccines contain dead or inactive pathogens or antigens, so they do not cause the disease. Exam tip: Explain the role of memory cells in the secondary response to show why the person does not become ill.
Key words
Say what each word means before you turn the card.
Memory cells
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Herd immunity
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See every definition
- Memory cells
- White blood cells produce these in response to a vaccine, and on later infection they recognise the pathogen's antigens and produce antibodies quickly.
- Herd immunity
- When a large proportion of a population is immunised, the pathogen cannot easily pass from person to person, so the spread of disease is reduced and unvaccinated people are protected.
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