title: Reduction of cytotoxicity in virus concentrates from environmental samples.
abstract: The reduction of cytotoxicity in virus concentrates from environmental samples was accomplished by high-speed centrifugation and by filtration of the samples through positively charged depth filters.
mesh_terms: D005374:Filtration / Q000379:methods; D012722:Sewage; D014461:Ultracentrifugation / Q000379:methods; D018406:Virus Physiological Phenomena; D014780:Viruses / Q000302:isolation & purification*; D014871:Water Microbiology
chemical_list: D012722:Sewage