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9 marksImmunology

CAPE Biology Unit 2 · May/June 2019 · Paper 2 · Question 3(b)(i)

Vaccination can be used to control the spread of mosquito-borne diseases.

With the aid of a labelled graph showing blood antibody concentration over time after vaccination, explain THREE ways in which vaccinations work to reduce the spread of diseases.

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Other parts of this question

  1. 3(a)(i)Assuming that epidemiologic week 1 (not shown on the graph) was the first week of January, in which month was the first confirmed case of a Zika virus…[1 mark]
  2. 3(a)(ii)List FOUR other observations from the data provided in Figure 3. Your statements can refer to the epidemiologic week (instead of month).[4 marks]
  3. 3(a)(iii)Explain the mechanisms by which viruses can be transmitted from an infected to an uninfected person by mosquitoes.[6 marks]
  4. 3(b)(ii)Distinguish between 'natural active immunity' and 'artificial active immunity'.[2 marks]
  5. 3(c)Discuss FOUR major economic impacts of diseases spread by mosquitoes.[8 marks]

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