title: Recovery of Gram negative bacteria with Hektoen agar.
mesh_terms: D000362:Agar; D001431:Bacteriological Techniques; D003470:Culture Media; D004755:Enterobacteriaceae / Q000302:isolation & purification*; D012722:Sewage; D014871:Water Microbiology
chemical_list: D003470:Culture Media; D012722:Sewage; D000362:Agar