title: [DETERMINATION OF THE AVERAGE LETHAL DOSE (LD50) AND EVALUATION OF ITS VALIDITY].
mesh_terms: D004668:Encephalitis Viruses; D004669:Encephalitis Viruses, Tick-Borne; D007928:Lethal Dose 50; D051379:Mice; D009522:Newcastle disease virus; D012106:Research; D014777:Virus Diseases
keywords: ENCEPHALITIS VIRUSES; ENCEPHALITIS VIRUSES, TICK-BORNE; EXPERIMENTAL LAB STUDY; MICE; NEWCASTLE DISEASE VIRUS; VIRUS DISEASES
vernacular_title: OPREDELENIE SREDNE I LETAL'NO I DOZY (LD-50) I OTSENKA EE ZNACHIMOSTI (DOSTOVERNOSTI)