The disease smallpox has been eradicated by a worldwide vaccination programme. Which set of reasons correctly identifies the problems associated with planning vaccination programmes to eradicate other diseases? [Figure: Table with columns 'TB', 'malaria', 'sickle cell anaemia', 'cholera']
✓ Correct Answer
The correct answer is C: different vaccines needed for active and dormant-to-active forms different stages with different antigens; invades body cells genetically inherited recessive condition invade gut cells where immune system less effective
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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