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5.1 Health and communicable disease

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Question 19

A water supplier tests 20 water samples before and after sewage treatment. The number of samples in which cholera bacteria are detected is shown.

Water samplesSamples with cholera bacteria detected
Before sewage treatment16
After sewage treatment2

Using the results and your knowledge, explain why sewage treatment should be combined with handwashing to reduce cholera transmission.

[3]
Markscheme

5.1 Health and communicable disease Questions

  1. GCSE
  2. /Biology
  3. /5.1 Health and communicable disease

112 exam-style questions on Edexcel GCSE Biology 5.1 Health and communicable disease, covering 5.1.1 Communicable and non-communicable diseases, 5.1.2 Disease susceptibility interactions, 5.1.3 Pathogens as disease-causing organisms, 5.1.4 Common infections, 5.1.5 Spread and prevention of pathogens, 5.1.6 Lifecycle of a virus, and 5.1.7 Spread and prevention of STIs. Each one has a worked solution and a mark scheme showing where the marks go.

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