Figure 3. Kaplan-Meier survival curves for Serengeti lions.

There was no significant difference in the survival schedules (χ² = 6.76, d.f. = 3, p>0.05, Cox proportional hazard model with censoring for the six individuals yet to die and controlling for the birth year) for lions without any trypanosome infections (median survival time = 9.59 years, 95% CIs 5.79–10.93 years), those infected with T. brucei only (10.84, 95% CIs 7.52–12.64), those infected with T. congolense only (9.47, 8.61–10.28), and those infected with both species (10.32, 3.54–11.53).