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3.1 Communicable diseases

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Question 22
F

In 1997 the UK began a programme of vaccinating poultry against Salmonella. The figure shows the number of confirmed cases of Salmonella food poisoning in the UK in four years.

Figure: The number of confirmed cases of Salmonella food poisoning in the UK in 1997, 2002, 2007 and 2012

image

a.

Give the number of confirmed cases in 2007.

[1]
b.

Calculate the percentage decrease in the number of confirmed cases between 1997 and 2012.

[2]
c.

Explain how vaccinating poultry against Salmonella reduces the number of cases of Salmonella food poisoning in people.

[2]
d.

The number of cases did not fall to zero. Suggest one reason why.

[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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