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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of virology 28 (1969), S. 212-218 
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The prototype CoH35211 strain of Guaroa virus contained 2 different plaque populations when French or Mann agarose were used for solidifying the overlay medium. The pl1L (large) and p12S (small) plaque variants were similar with respect to pathogenicity for suckling mice (SM), titers achieved in SM brains after intracranial inoculation and time of appearance of plaques under agarose overlay. The prototype CoH35211 strain and the 2 plaque variants were indistinguishable by complement-fixation and plaque-neutralization tests. However, the 2 plaque variants differed with respect to plaque size and sensitivity to the inhibitory effects of sulfated agar polysaccharides. The only different serological relationship was a “one-way” cross-reaction between p12S antibody and California encephalitis and Tahyna viruses by plaque-neutralization test.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The CCA activity of formalin-inactivated influenza vaccine prepared by the conventional Sharples and the newer ether-degraded hemagglutinin processes was reduced by freezing and subsequent storage at −20
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archives of virology 40 (1973), S. 359-365 
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The results of serological testing of nonhuman primate sera obtained over a four-year period showed a high incidence of antibodies to influenza virus strains of the H2 and H3 hemagglutinin sub-types. This would indicate that outbreaks of type A influenza virus infection occurred in certain primate species and suggest another possible reservoir for influenza virus in nature. Hemagglutination-inhibition (HI) testing of sera collected from African green monkeys captured in the Kenya-Tanzania area of East Africa demonstrated significant antibody titers to A/Hong Kong (HK)/68 (H3N2) virus in serum samples obtained 8 to 10 months prior to the first report of influenza-like illness in East Africa, and 3 to 5 months prior to the first report of outbreaks of acute respiratory disease in southeastern China due to A/HK/68 (H3N2). The results suggest that certain species of nonhuman primates may be involved in the epidemiology of influenza due to their close association with human living areas.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Archives of virology 40 (1973), S. 366-374 
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A heat-labile accessory factor present in native (unheated) normal serum was found to replace the vaccinia virus neutralizing activity of immune serum destroyed by heating at 56° C for 30 minutes. Treatment of serum samples with ammonium hydroxide or cobra snake venom did not significantly reduce the activity of immune serum. Also, inactivation studies with the properdin deficient (PR) fraction of immune serum after zymosam treatment did not alter the neutralizing activity of immune serum. The neutralization kinetics of vaccinia virus were altered in the presence of the accessory factor. However, the optimum conditions for neutralization were not changed. In the hemagglutination-inhibition (HI) test procedure, heating decreased the HI activity of vaccinia immune serum, but the addition of native normal rabbit serum did not restore the lost activity. Although individual components of complement might affect vaccinia neutralization, it appeared that a heat-labile accessory factor, other than properdin or complement, was required for the complete neutralizing activity of vaccinia immune serum.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effects of various commonly used procedures for removing non-specific viral inhibitors upon serum proteins and immunoglobulins were evaluated. Several types of effects were observed. Treatment with ether, chicken red blood cells, receptor destroying enzyme (RDE), and RDE plus heat (65
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Archives of virology 36 (1972), S. 296-310 
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A tissue culture-adapted pantropic strain, two attenuated live vaccine strains and three neurotropic strains of measles virus were compared as to their growth potential, plaque formation, and interferon production in cell cultures, and pathogenicity for suckling hamsters. The properties characteristic of neurotropic measles strains included an enhanced capacity to form syncytia, a reduced, more cell-restricted proliferation cycle, and the development of large fast-growing plaques in Vero cell cultures under agarose overlay. These properties were pronounced with the hamsteradapted HNT and the Vero cell passaged Schwarz vaccine strains, both pathogenic when inoculated intracerebrally into suckling hamsters. Two measles viruses isolated from human brain with subacute sclerosing panencephalitis were not neurotropic for hamsters. Only one of the latter strains retained some of the properties characteristic for neutrotropism. Interferon induction in BS-C-1 cells was enhanced with both the attenuated and the neurotropic virus strains. The most pronounced marker which distinguished the pantropic and neurotropic strains from the vaccine strains was the inability of the former to grow in chick embryo fibroblast cultures.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Archives of virology 37 (1972), S. 211-217 
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Removal of avian leukosis viruses (ALV), which have contaminated the yellow fever (YF) 17 D vaccine since its development in the middle 1940's, had no effect upon the antigenicity of this vaccine in rhesus monkeys. From results of plaque neutralization tests, the high degree of antigenicity of the 17 D vaccine was confirmed. Pre-existing cross-reacting antibodies to other antigenically related arboviruses did not interfere with the antibody response to YF vaccine. However, administration of YF vaccine did elicit antibodies capable of cross-reacting with West Nile, and less so with Langat, arbovirus antigens.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The isolation and serologic identification by cross neutralization tests showed the presence of simian foamy virus serotypes 1 and 2 in primary rhesus monkey brain, spleen, and kidney cell cultures. The frequency of isolation of foamy viruses from brain and spleen cell cultures was 86% and from kidney cell cultures it was 36%. In primary spleen cell cultures 50% of the foamy virus isolates were type 2. Of the 14 animals from which foamy virus was isolated, only 4 demonstrated serum neutralizing antibody to the homologous serotype. The cytopathology of foamy viruses in the primary cell cultures is described.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 218 (1968), S. 876-877 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] After isolating the SHF virus strains causing the NIH outbreak we tested sera from monkeys involved in the Sukhumi epizootic by a complement fixation test with a 20 x concentrated virus-infected cell culture antigen prepared from the prototype LVR 42-0/M6941 strain. Dr Robert J. Huebner kindly ...
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Archives of virology 22 (1967), S. 273-279 
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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