AQA · GCSE · Biology

    Course version: 8461 · Version from Sept 2018

    Vaccination involves introducing small quantities of dead or inactive…

    Full specification wording

    Vaccination: Vaccination involves introducing small quantities of dead or inactive forms of a pathogen into the body to stimulate the white blood cells to produce antibodies.

    Vaccination introduces a small quantity of dead or inactive pathogen, or antigens from it, into the body.

    Checked against the AQA 8461 specification (opens in a new tab) on .

    • Point 2 of 3
    • 4 key terms

    Study notes

    From the checked teaching notes for this specification point.

    The idea

    Vaccination introduces a small quantity of dead or inactive pathogen, or antigens from it, into the body. Because the pathogen is dead or inactive, it cannot cause the disease, but its antigens are still recognised as foreign. White blood cells called lymphocytes respond by producing antibodies that are specific to those antigens. The person also produces memory cells. If the live pathogen later enters the body, the memory cells recognise the same antigens and trigger a faster, larger antibody response. The pathogen is destroyed before it can cause illness, so the person is immune.

    For example: The MMR vaccine contains weakened measles, mumps and rubella viruses, stimulating antibodies without causing the diseases.

    What earns the marks

    • Vaccination introduces a small quantity of dead or inactive pathogen, or antigens, into the body.
    • The pathogen in the vaccine is dead or inactive, so it does not cause the disease.
    • White blood cells, specifically lymphocytes, are stimulated to produce antibodies.
    • The antibodies produced are specific to the antigens on the pathogen in the vaccine.
    • Memory cells are produced, so a later infection with the live pathogen triggers a faster antibody response.
    • The person becomes immune to that pathogen without having suffered the disease.

    Common mistakes and how to put them right

    • Saying the vaccine contains antibodies.

      Put it right: The vaccine contains dead or inactive pathogen or antigens, and the body produces its own antibodies.

    • Thinking the vaccine directly kills the pathogen.

      Put it right: The vaccine stimulates white blood cells to produce antibodies and memory cells, which provide protection on later infection.

    • Believing any pathogen can be used in any vaccine.

      Put it right: The pathogen or antigens in a vaccine must match the specific pathogen being protected against.

    Exam tips

    • State that the pathogen is dead or inactive so it cannot cause disease, then explain how antibodies are produced.
    • Use the term memory cells when explaining how vaccination gives long-term protection.
    • Link the antigens in the vaccine to the specific antibodies produced, showing that the response is specific.

    Try the lesson

    The start of the Vaccination: Vaccination involves introducing small quantities of dead or inactive forms of a pathogen into the body to stimulate the white blood cells to produce antibodies. lesson, made from checked teaching notes for this specification point.

    Have a go first

    What is introduced into the body during a vaccination?

    Listen

    Vaccination introduces a small quantity of dead or inactive pathogen, or antigens from it, into the body. Because the pathogen is dead or inactive, it cannot cause the disease, but its antigens are still recognised as foreign. White blood cells called lymphocytes respond by producing antibodies that are specific to those antigens. The person also produces memory cells. If the live pathogen later enters the body, the memory cells recognise the same antigens and trigger a faster, larger antibody response. The pathogen is destroyed before it can cause illness, so the person is immune. For example, the MMR vaccine contains weakened measles, mumps and rubella viruses, stimulating antibodies without causing the diseases. A strong answer earns marks for these points. Vaccination introduces a small quantity of dead or inactive pathogen, or antigens, into the body. The pathogen in the vaccine is dead or inactive, so it does not cause the disease. White blood cells, specifically lymphocytes, are stimulated to produce antibodies. The antibodies produced are specific to the antigens on the pathogen in the vaccine. A common slip: Saying the vaccine contains antibodies. Instead, the vaccine contains dead or inactive pathogen or antigens, and the body produces its own antibodies. Exam tip: State that the pathogen is dead or inactive so it cannot cause disease, then explain how antibodies are produced.

    See it

    A top-down flowchart. The first box says dead or inactive pathogen or antigens introduced. An arrow leads to a box saying cannot cause the disease. A second arrow leads to a box saying antigens recognised as foreign, which leads to lymphocytes stimulated. From lymphocytes stimulated, one arrow leads to antibodies specific to the antigens produced. Another arrow leads to memory cells produced, which leads to live pathogen later enters the body, then memory cells recognise the same antigens, then a faster, larger antibody response, then pathogen destroyed before it causes illness, and finally the person is immune.
    This flowchart shows how introducing a dead or inactive pathogen or its antigens leads to antibody and memory cell production, and how memory cells give a faster response and immunity on later infection.

    Key words

    Say what each word means before you turn the card.

    Vaccination

    Try answering aloud or in your head before turning the card.

    Antigens and antibodies

    Try answering aloud or in your head before turning the card.

    Memory cells

    Try answering aloud or in your head before turning the card.

    Immunity

    Try answering aloud or in your head before turning the card.

    See every definition
    Vaccination
    Introducing small quantities of dead or inactive forms of a pathogen into the body to stimulate the white blood cells to produce antibodies.
    Antigens and antibodies
    Antigens from the pathogen are recognised as foreign, and white blood cells called lymphocytes produce antibodies that are specific to those antigens.
    Memory cells
    Cells the person produces so that if the live pathogen later enters the body, they recognise the same antigens and trigger a faster, larger antibody response.
    Immunity
    The pathogen is destroyed before it can cause illness, so the person is immune to that pathogen without having suffered the disease.

    Label the diagram

    Some boxes have lost their names. Pick the right name for each number.

    The diagram again, with 3 boxes numbered instead of named. A top-down flowchart. The first box says dead or inactive pathogen or antigens introduced. An arrow leads to a box saying cannot cause the disease. A second arrow leads to a box saying antigens recognised as foreign, which leads to lymphocytes stimulated. From lymphocytes stimulated, one arrow leads to antibodies specific to the antigens produced. Another arrow leads to memory cells produced, which leads to live pathogen later enters the body, then memory cells recognise the same antigens, then a faster, larger antibody response, then pathogen destroyed before it causes illness, and finally the person is immune.

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    • 2Box 2

    • 3Box 3

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