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Search: WFRF:(Biberfeld G)

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  • Abbadessa, G, et al. (author)
  • Unsung hero Robert C. Gallo
  • 2009
  • In: Science (New York, N.Y.). - : American Association for the Advancement of Science (AAAS). - 1095-9203 .- 0036-8075. ; 323:5911, s. 206-207
  • Journal article (other academic/artistic)
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  • Makitalo, B, et al. (author)
  • Enhanced cellular immunity and systemic control of SHIV infection by combined parenteral and mucosal administration of a DNA prime MVA boost vaccine regimen
  • 2004
  • In: The Journal of general virology. - : Microbiology Society. - 0022-1317 .- 1465-2099. ; 85:Pt 8, s. 2407-2419
  • Journal article (peer-reviewed)abstract
    • The immunogenicity and protective efficacy of a DNA and recombinant modified vaccinia Ankara (MVA) vaccine administered by two different routes were investigated. DNA expressing HIV-1 IIIB env, gag, RT, rev, tat and nef, and MVA expressing HIV-1 IIIB nef, tat and rev and simian immunodeficiency virus (SIV) macJ5 gag/pol and vaccinia HIV-1 env, were used as immunogens. Four cynomolgus macaques received DNA intramuscularly (i.m.) at month 0 and intrarectally (i.r.) and intra-orally (i.o.) at 2 months, followed by MVA i.m. at 4 months and i.r. and i.o. at 8 months. Another group of four monkeys received the same immunogens but only i.m.. Overall, stronger cellular immune responses measured by ELISPOT and T-cell proliferation assay were detected in the group primed i.m. and boosted mucosally. Following homologous intravenous simian-human immunodeficiency virus (SHIV) challenge, one of eight vaccinated animals was completely protected. This monkey, immunized i.m. and i.r.+i.o., exhibited the highest levels of HIV Env, Nef and Tat antibodies, high HIV Tat cytotoxic T-lymphocyte activity and T-lymphocyte proliferative responses to HIV Env. Four weeks post-challenge none of the monkeys immunized i.m. and i.r.+i.o., and only two out of four animals immunized i.m., demonstrated detectable plasma viral RNA levels. In contrast, all eight control animals had demonstrable plasma viral RNA levels 4 weeks post-challenge. Thus, stronger cellular immune responses and reduction of challenge virus burden were demonstrated in animals immunized i.m. as well as mucosally, compared with animals immunized i.m. only. The breadth and magnitude of the induced immune responses correlated with protective efficacy.
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  • Msafiri, F, et al. (author)
  • Frequent Anti-V1V2 Responses Induced by HIV-DNA Followed by HIV-MVA with or without CN54rgp140/GLA-AF in Healthy African Volunteers
  • 2020
  • In: Microorganisms. - : MDPI AG. - 2076-2607. ; 8:11
  • Journal article (peer-reviewed)abstract
    • Antibody responses that correlated with reduced risk of HIV acquisition in the RV144 efficacy trial were assessed in healthy African volunteers who had been primed three times with HIV-DNA (subtype A, B, C) and then randomized into two groups; group 1 was boosted twice with HIV-MVA (CRF01_AE) and group 2 with the same HIV-MVA coadministered with subtype C envelope (Env) protein (CN54rgp140/GLA-AF). The fine specificity of plasma Env-specific antibody responses was mapped after the final vaccination using linear peptide microarray technology. Binding IgG antibodies to the V1V2 loop in CRF01_AE and subtype C Env and Env-specific IgA antibodies were determined using enzyme-linked immunosorbent assay. Functional antibody-dependent cellular cytotoxicity (ADCC)-mediating antibody responses were measured using luciferase assay. Mapping of linear epitopes within HIV-1 Env demonstrated strong targeting of the V1V2, V3, and the immunodominant region in gp41 in both groups, with additional recognition of two epitopes located in the C2 and C4 regions in group 2. A high frequency of V1V2-specific binding IgG antibody responses was detected to CRF01_AE (77%) and subtype C antigens (65%). In conclusion, coadministration of CN54rgp140/GLA-AF with HIV-MVA did not increase the frequency, breadth, or magnitude of anti-V1V2 responses or ADCC-mediating antibodies induced by boosting with HIV-MVA alone.
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  • Nilsson, C, et al. (author)
  • Immunization with recombinant modified vaccinia virus Ankara can modify mucosal simian immunodeficiency virus infection and delay disease progression in macaques
  • 2002
  • In: The Journal of general virology. - : Microbiology Society. - 0022-1317 .- 1465-2099. ; 83:Pt 4, s. 807-818
  • Journal article (peer-reviewed)abstract
    • In the present study, the immunogenicity and protective efficacy of a recombinant vaccinia virus-based simian immunodeficiency virus (SIV) vaccine, given alone or in combination with a protein boost, were investigated. Cynomolgus macaques were immunized intramuscularly with modified vaccinia virus Ankara (MVA) expressing the SIVsmenvandgag–polgenes (MVA–SIVsm) at 0 and 3 months (n=4), at 0, 3 and 8 months (n=4) or at 0 and 3 months followed by purified native SIVsm gp148 and recombinant SIVmac p27 in immunostimulatory complexes at 8 months (n=4). One month after the last immunization, the vaccinees, together with four naive control monkeys and four monkeys immunized with wild-type MVA, were challenged intrarectally with 10 MID50SIVsm. At the time of challenge, antibody titres to SIV Env and lymphocyte proliferation responses to whole viral antigen were highest in vaccinees receiving MVA–SIVsm in combination with protein immunizations. Following rectal challenge, one of these vaccinees was completely protected. A prolonged survival time was observed in two of four monkeys in each of the groups immunized with MVA–SIVsm, in two monkeys given MVA–SIVsm followed by protein and in three of four monkeys given wild-type MVA, compared with naive controls. In conclusion, one monkey given the combined vaccine was protected completely against SIVsm infection. Furthermore, immunization with MVA–SIVsm, as well as wild-type MVA alone, seemed to delay disease progression after mucosal SIV infection in a proportion of the monkeys.
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  • Result 1-50 of 195

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