A-LevelBiologyInfectious diseases9700/12 · May/June 2015 · Q341 Mark
The graph shows the fall in cases of tuberculosis (TB) in a country between 1910 and 2000. Which factors could have contributed to the fall over this period? 1 pasteurisation of milk 2 the provision of new housing 3 chemical treatment of sewage 4 identification of contacts of people infected with TB
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A1, 2 and 4
B2, 3 and 4
C1 and 3 only
D1 and 4 only
✓ Correct answer
A: 1, 2 and 4
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