Biology 9700 · AS & A Level · Antibodies and vaccination
Antibodies and vaccination — practice question
Cholera is an infectious disease that can infect both children and adults. Symptoms may appear very rapidly, within a few hours or after a few days. Table 4.1 gives the economic status of five countries, the number of cholera cases reported to the World Health Organization (WHO) across a five year period for each country, and each country's population in 2006 and in 2010.
(a(i))[3]
Table 4.1 indicates that the number of cholera cases differs between the high economic status country and the low economic status country. Suggest three reasons to account for these differences.
(a(ii))[4]
With reference to Table 4.1, suggest why the number of cholera cases reported across the five year period is different for Angola and Cameroon.
(b(i))[2]
Suggest two reasons why measles vaccination programmes may not stop epidemics.
(b(ii))[3]
Outline the B-lymphocyte response when an individual who is already immune to measles is exposed to Morbillivirus.
Worked solution & mark scheme
This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Insanitary conditions / unsafe water supplies / inadequate sewage treatment” …