Age specific seroprevalence plots for AMA-1 for Sumve, Biharamulo and Rubya. For Biharamulo two forces of infection were fitted for the other two sites one force of infection fitted the data best. The seroconversion rate (SCR, λ) for Sumve was 0.082 (95% CI 0.063-0.11). For Biharamulo the SCR was 0.34 (95% CI 0.19-0.61) for the period up to 1999 (i.e. for individuals older than 10 years of age) but 0.019 (95% CI 0.011-0.035) for the period 1999-2009. The SCR for Rubya was 0.041 (95% CI 0.029 - 0.058).