The purpose of this study is to determine differences between cure rates vs re-infection levels.  The fundamental question is to see what the prevalence and intensity are before MDA, and then, see what those are 7 to 8 weeks after MDA.  Since there are villages that continue to have high prevalence from year to year, we will determine if this primarily represents reinfection occurring since the last annual MDA or if it is related more to treatment efficacy.