Fig 10. Relationship between Ro (y-axis) and numbers of tsetse (x-axis) for settings where the average infectious period is 1–4 years.

To obtain an estimate of the level of tsetse control required to stop transmission we have re-arranged a published model [10]. The average infectious period is usually accepted as 3 years and so we can see that a reduction in tsetse numbers of approximately 72% is required to drive R0<1.