AQA · GCSE · Biology

    Course version: 8461 · Version from Sept 2018

    In the UK, poultry are vaccinated against Salmonella to control the spread.

    Full specification wording

    Bacterial diseases: In the UK, poultry are vaccinated against Salmonella to control the spread.

    Salmonella is a bacterium that can cause food poisoning in humans, typically after eating contaminated food such as undercooked chicken or eggs.

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

    • Point 2 of 7
    • 3 key terms

    Study notes

    From the checked teaching notes for this specification point.

    The idea

    Salmonella is a bacterium that can cause food poisoning in humans, typically after eating contaminated food such as undercooked chicken or eggs. In the UK, poultry such as chickens and turkeys are routinely vaccinated against Salmonella. Vaccination introduces a harmless form of the pathogen, so the bird's immune system produces antibodies and memory cells without becoming ill. If the bird later meets Salmonella, its immune response is rapid and the bacterium is destroyed, so fewer birds carry the pathogen. This reduces the chance that contaminated meat or eggs reach consumers, breaking the chain of transmission and controlling the spread of the disease. The vaccination programme is therefore a preventive control measure rather than a treatment for infected birds.

    What earns the marks

    • Salmonella is a bacterium that causes food poisoning in humans, often linked to eating contaminated poultry or eggs.
    • Vaccination gives poultry immunity without causing the disease, because the vaccine contains a harmless form of the pathogen.
    • Immune memory means vaccinated birds destroy Salmonella quickly on later exposure, so they are less likely to carry and shed the bacterium.
    • Fewer infected birds means less contaminated meat and eggs reach consumers, reducing human cases and controlling spread.
    • Vaccination is a preventive control measure applied to the poultry population, not a cure for birds already infected.

    Common mistakes and how to put them right

    • Thinking the vaccine treats a bird that already has Salmonella.

      Put it right: Vaccination prevents disease by preparing the immune system before exposure.

    • Confusing vaccination with antibiotic treatment.

      Put it right: Vaccines stimulate immunity, whereas antibiotics kill bacteria in an infected individual.

    • Assuming vaccination guarantees zero Salmonella in all poultry products.

      Put it right: It greatly reduces the risk but hygiene and cooking remain important.

    Exam tips

    • Link the vaccination of poultry directly to reduced human food poisoning, not just to healthier birds.
    • Use the terms immune system, antibodies and memory cells to show the biological mechanism.
    • If asked to evaluate control measures, compare vaccination with hygiene measures such as cooking food thoroughly and refrigerating it correctly.

    Try the lesson

    The start of the Bacterial diseases: In the UK, poultry are vaccinated against Salmonella to control the spread. lesson, made from checked teaching notes for this specification point.

    Have a go first

    In the UK, why are poultry vaccinated against Salmonella?

    Listen

    Salmonella is a bacterium that can cause food poisoning in humans, typically after eating contaminated food such as undercooked chicken or eggs. In the UK, poultry such as chickens and turkeys are routinely vaccinated against Salmonella. Vaccination introduces a harmless form of the pathogen, so the bird's immune system produces antibodies and memory cells without becoming ill. If the bird later meets Salmonella, its immune response is rapid and the bacterium is destroyed, so fewer birds carry the pathogen. This reduces the chance that contaminated meat or eggs reach consumers, breaking the chain of transmission and controlling the spread of the disease. The vaccination programme is therefore a preventive control measure rather than a treatment for infected birds. A strong answer earns marks for these points. Salmonella is a bacterium that causes food poisoning in humans, often linked to eating contaminated poultry or eggs. Vaccination gives poultry immunity without causing the disease, because the vaccine contains a harmless form of the pathogen. Immune memory means vaccinated birds destroy Salmonella quickly on later exposure, so they are less likely to carry and shed the bacterium. Fewer infected birds means less contaminated meat and eggs reach consumers, reducing human cases and controlling spread. A common slip: Thinking the vaccine treats a bird that already has Salmonella. Instead, vaccination prevents disease by preparing the immune system before exposure. Exam tip: Link the vaccination of poultry directly to reduced human food poisoning, not just to healthier birds.

    See it

    A top-down flowchart with nine boxes linked by arrows. The first box reads 'Vaccine contains harmless form of Salmonella' and points to 'Bird's immune system responds', which points to 'Antibodies and memory cells produced', then to 'Bird does not become ill', then to 'Later exposure to Salmonella', then to 'Rapid immune response destroys bacterium', then to 'Fewer birds carry Salmonella', then to 'Less contaminated meat and eggs reach consumers', and finally to 'Reduced human food poisoning and spread controlled'.
    Shows how vaccinating poultry against Salmonella leads to fewer birds carrying the bacterium and so reduces contaminated meat and eggs reaching consumers, controlling the spread of the disease.

    Key words

    Say what each word means before you turn the card.

    Salmonella

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

    Vaccination

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

    Preventive control measure

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

    See every definition
    Salmonella
    A bacterium that can cause food poisoning in humans, typically after eating contaminated food such as undercooked chicken or eggs.
    Vaccination
    Introduces a harmless form of the pathogen, so the bird's immune system produces antibodies and memory cells without becoming ill.
    Preventive control measure
    A measure applied to the poultry population rather than a treatment for infected birds, breaking the chain of transmission and controlling the spread of 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 with nine boxes linked by arrows. The first box reads 'Vaccine contains harmless form of Salmonella' and points to 'Bird's immune system responds', which points to 'Antibodies and memory cells produced', then to 'Bird does not become ill', then to 'Later exposure to Salmonella', then to 'Rapid immune response destroys bacterium', then to 'Fewer birds carry Salmonella', then to 'Less contaminated meat and eggs reach consumers', and finally to 'Reduced human food poisoning and spread controlled'.

    • 1Box 1

    • 2Box 2

    • 3Box 3

    0 of 3 labelled

    There is more to this lesson

    The full lesson goes on to check your understanding and help you earn the marks. Create a free account to carry on, with your progress saved.

    Carry on with the full lesson

    A week of Premium from your first lesson · Then the free plan continues · No card, no charge

    Test your understanding of Bacterial diseases: In the UK, poultry are vaccinated against Salmonella to control the spread.

    Active recall beats re-reading. Take an instant quiz now to test what you’ve learned and lock it into long-term memory.

    Take topic quiz

    A week of Premium from your first lesson · Then the free plan continues · No card, no charge

    Start free

    Cookies on MasteryMind

    Essential cookies keep you signed in.

    Analytics and advertising cookies stay off unless you accept.

    Read our Privacy Policy.