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3.1 Communicable diseases

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Question 101
F

Salmonella bacteria can live in the gut of chickens without making the chickens ill. If a person eats meat from an infected chicken, the person can get food poisoning. A farmer vaccinates the chickens on the farm against Salmonella.

a.

Explain how vaccinating the chickens reduces the number of people who get food poisoning from the meat.

[3]
b.

The farmer vaccinates 95% of the chickens rather than all of them. Explain why the unvaccinated chickens are still unlikely to become infected.

[2]
c.

Suggest one reason why vaccinating the chickens does not remove the risk of food poisoning completely.

[1]
Markscheme

3.1 Communicable diseases Questions

  1. GCSE
  2. /Biology
  3. /3.1 Communicable diseases

176 exam-style questions on AQA GCSE Biology 3.1 Communicable diseases, covering 3.1.1 Communicable (infectious) diseases, 3.1.2 Viral diseases, 3.1.3 Bacterial diseases, 3.1.4 Fungal diseases, 3.1.5 Protist diseases, 3.1.6 Human defence systems, 3.1.7 Vaccination, 3.1.8 Antibiotics and painkillers, and 3.1.9 Discovery and development of drugs. Each one has a worked solution and a mark scheme showing where the marks go.

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