Figure 1.

Reduction in microfilaraemia load (efficacy) following repeated treatments with single (A) or combination therapies (B) with antifilarial drugs. Data are from filed trials in India [31]. Dots are observations and the lines are based on the fitting of non-linear function of the form with y being the efficacy after x number of treatments. The parameter a measures the initial rate of increase of y with x, and y reaches a saturation level b', with .