Exposure, hazard, and vulnerability and their contribution to Schistosoma haematobium re-infection in northern Senegal Autor Andrea J Lund, PhD, Susanne H Sokolow, PhD, Isabel J Jones, PhD, Chelsea L Wood, PhD, Sofia Ali, BA, Andrew Chamberlin, BS, Alioune Badara Sy, MEd, M Moustapha Sam, MEd, Nicolas Jouanard, MS, Anne-Marie Schacht, MS, Simon Senghor, BS, Assane Fall, BS, Raphael Ndione, MS, Gilles Riveau, ProfPhD, Giulio A De Leo, ProfPhD, David Lopez-Carr, ProfPhD