Quelpr
6 marksSocial and Preventative Medicine

CAPE Biology Unit 2 · May/June 2019 · Paper 2 · Question 3(a)(iii)

Aedes mosquitoes are widespread throughout the Caribbean and are associated with the spread of viral diseases such as Zika, dengue and chikungunya. Figure 3 provides data for a Zika outbreak in Dominica in 2016.

Explain the mechanisms by which viruses can be transmitted from an infected to an uninfected person by mosquitoes.

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

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(b)(i)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…[9 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]

More practice: the rest of this paper · more Social and Preventative Medicine questions · all CAPE Biology Unit 2 past papers