pollution de l'eau (1) eau usée (1) test (1) salmonelle (1) santé publique (1) agent pathogène (1) papier (1) lipide (1) indicateur (1) champ (1) effet (1) eau potable (1) investigation (1) couleur (1) côte (1) Development (1) Control (1) Methods (1) Salmonella typhimurium (1) Salmonella (1) Water--Pollution (1) Water (1) Trials (1) Sewage (1) Rivers (1) Red (1) Reaction time (1) Public health (1) Plate (1) Paper (1)