title: [The phenomenon of antigenic defectiveness in naturally circulating strains of the tick-borne encephalitis virus and its possible connection to seronegative forms of the disease].
abstract: Ten strains of tick-borne encephalitis (TBE) virus isolated from single specimens of I. persulcatus ticks were studied. The strains were divided into antigenically complete (AC) and antigenically defective (AD), depending on the presence or absence of some virus antigens in concentrated virus preparations, characteristics in rocket immune electrophoresis (RIEP), rate and intensity of humoral immune response in monkeys and rabbits, and plaque size in SPEV cell culture. The AC-strain markers include high activities of precipitating, hemagglutinating (HA), and complement-fixing (CF) antigens, formation of precipitates moving in rocket shape towards anode and cathode in RIEP, rapid development of antihemagglutinins and virus-neutralizing antibodies, large plaques (3-5 mm). The AD variants are characterized by the lack of HA and precipitating activity, low titres of CF antigen, slow and poor immune response, the lack of cathode precipitate "rocket", very small plaques. The antigenic defectiveness is transitory and shows in early passages; after 10-11 passages in SPEV cell cultures or in white mice, transformation AD----AC occurs. A transformed strain is neutralized, like standard TBE strains, by blood sera of a typical patient with poliomyelitis-like form of TBE. Examinations of blood sera from the population of an endemic zone (Yaroslavl Province) and 67 TBE patients (Kurgan Province) demonstrated the association of AC and AD variants with the formation of immune portion of the population and TBE etiology. Cases of the disease confirmed by seroconversion in HI with commercial diagnosticum are associated with AC variants, whereas AD variants are associated with those TBE cases which are difficult to diagnose using the commercial diagnosticum.
authors.forename: V V
authors.initials: VV
authors.lastname: Pogodina
authors.forename: N G
authors.initials: NG
authors.lastname: Bochkova
authors.forename: T I
authors.initials: TI
authors.lastname: Dzhivanian
authors.forename: L S
authors.initials: LS
authors.lastname: Levina
authors.forename: G G
authors.initials: GG
authors.lastname: Karganova
authors.forename: R A
authors.initials: RA
authors.lastname: Riasova
authors.forename: V A
authors.initials: VA
authors.lastname: Sergeeva
authors.forename: V A
authors.initials: VA
authors.lastname: Lashkevich
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000097:blood; D000940:Antigenic Variation / Q000276:immunology*; D000956:Antigens, Viral / Q000276:immunology*; D006224:Cricetinae; D004197:Disease Reservoirs; D004669:Encephalitis Viruses, Tick-Borne / Q000276:immunology* / Q000302:isolation & purification / Q000472:pathogenicity; D004675:Encephalitis, Tick-Borne / Q000453:epidemiology / Q000276:immunology*; D006801:Humans; D008252:Macaca fascicularis; D008647:Mesocricetus; D051379:Mice; D011817:Rabbits; D016036:Seroepidemiologic Studies; D013987:Ticks / Q000382:microbiology; D014586:USSR / Q000453:epidemiology
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral
vernacular_title: Iavlenie antigennoĭ defektnosti u tsirkuliruiushchikh v prirode shtammov virusa kleshchevogo éntsefalita i ego vozmozhnaia sviaz' s seronegativnymi formami zabolevaniia.