A successful vaccination programme provides a level of immunity where the majority of a population is protected. There are several factors that can affect the success of a vaccination programme. Which row correctly shows the factors that can affect the success of a vaccination programme?
✓ Correct Answer
The correct answer is B: frequent mutation of the pathogen (affects), vaccination from eight weeks old (affects), pathogen is able to invade T-cells (affects), booster vaccinations needed frequently (not affects)
📋 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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