May/June 2026 Paper 23

2026 · 40 questions · 40 parts · 40 marks

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26Antibiotics ResistanceMedium1 mark
The graph shows the effect of an antibiotic treatment on bacterial populations in the blood.
Graph of bacterial population against time / days (0 to 10): an arrow marks the start of antibiotic treatment at about day 1, when the population is at its highest; the population then falls in an S-shaped curve to zero at about day 8
Which conclusion can be drawn from the graph?