Virus neutralising antibody responses at each measured timepoint are shown for group 1 (low dose, A), group 2 (middle dose, B) and group 3 (high dose, C). Arrowheads indicate administration of Rabipur (an inactivated rabies vaccine), with samples having been collected before Rabipur administration on applicable days. Each datapoint represents an individual volunteer, with lines connecting datapoints from an individual. Horizontal dashed line indicates 0·5 IU/mL (indicator of adequate vaccination). The same data are in the appendix (p 10).