A-LevelBiologyInfectious diseasesOct/Nov 2021Paper 1 Q381 Mark
Comorbidity is where an individual has two or more diseases or medical conditions at the same time. Some medical conditions are particularly likely to result in comorbidity. In one example, initial infection with one pathogen can increase the risk of developing a second disease by a factor of 15 or more. The second disease is then the major cause of death for these people. Which description could fit this example?
Acholera infection followed by development of malaria
Bcholera infection followed by development of AIDS
CHIV infection followed by development of TB
Dmalaria infection followed by development of TB
✓ Correct Answer
The correct answer is C: HIV infection followed by development of TB
📋 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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