GiveWell spoke with Dr. Lo, an MD-PhD candidate at Stanford University who specializes in mathematical modeling and economic analysis of neglected tropical diseases. GiveWell conducted this conversation as part of its investigation into the biological consequences of schistosomiasis and soil-transmitted helminth (STH) infections. Conversation topics included health consequences of worm infections, the processes used to estimate disability weights for worm infections, and metrics for tracking the effectiveness of mass drug administration programs.