Trial reportClinical and vaccine immunology : CVI2009
Safety and immunogenicity of the Merck adenovirus serotype 5 (MRKAd5) and MRKAd6 human immunodeficiency virus type 1 trigene vaccines alone and in combination in healthy adults.
Trial report in Clinical and vaccine immunology : CVI, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT00850616 (A Phase I Dose Ranging Study of the Safety, Tolerability, and Immunogenicity of a 3-Dose Regimen of the MRKAd5 HIV-1 Trigene and the MRKAd6 HIV-1 Trigene Vaccines Alone and in Combination in Healthy Adults), which is not on this map. Cited by 32 papers, 1 of them a synthesis that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
A Phase I Dose Ranging Study of the Safety, Tolerability, and Immunogenicity of a 3-Dose Regimen of the MRKAd5 HIV-1 Trigene and the MRKAd6 HIV-1 Trigene Vaccines Alone and in Combination in Healthy Adults
Who cites it
32 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Effect of rAd5-Vector HIV-1 Preventive Vaccines on HIV-1 Acquisition: A Participant-Level Meta-Analysis of Randomized Trials.PloS one · 2015Pooled it
- Assessment of the Safety and Immunogenicity of 2 Novel Vaccine Platforms for HIV-1 Prevention: A Randomized Trial.Annals of internal medicine · 2016Trial
- Trial
- Recombinant adenovirus type 5 HIV gag/pol/nef vaccine in South Africa: unblinded, long-term follow-up of the phase 2b HVTN 503/Phambili study.The Lancet. Infectious diseases · 2014Trial
- Adenovirus 5-vectored P. falciparum vaccine expressing CSP and AMA1. Part A: safety and immunogenicity in seronegative adults.PloS one · 2011Trial
- Phase I safety and immunogenicity evaluation of MVA-CMDR, a multigenic, recombinant modified vaccinia Ankara-HIV-1 vaccine candidate.PloS one · 2010Trial
- The role of naturally occurring and vaccine-induced Ad26 neutralizing antibodies in immunogenicity of Ad26-based vaccines.NPJ vaccines · 2026Article
- Systemic and Mucosal Immune Responses Induced by Adenoviral-Vectored Consensus H5 Influenza A Vaccines in Mice and Swine.Vaccines · 2025Article
- Adenoviral Vector System: A Comprehensive Overview of Constructions, Therapeutic Applications and Host Responses.Journal of microbiology (Seoul, Korea) · 2024Review
- Genomic Evolution and Recombination Dynamics of Human Adenovirus D Species: Insights from Comprehensive Bioinformatic Analysis.Journal of microbiology (Seoul, Korea) · 2024Review
- Review
- Seroprevalence of human adenovirus type 5 neutralizing antibodies in the Philippines.PloS one · 2023Article
- Adenovirus Type 6: Subtle Structural Distinctions from Adenovirus Type 5 Result in Essential Differences in Properties and Perspectives for Gene Therapy.Pharmaceutics · 2021Review
- Review
- Adenoviral vector vaccine platforms in the SARS-CoV-2 pandemic.NPJ vaccines · 2021Review
- Understanding Post Entry Sorting of Adenovirus Capsids; A Chance to Change Vaccine Vector Properties.Viruses · 2021Review
- Review
- Factors Which Contribute to the Immunogenicity of Non-replicating Adenoviral Vectored Vaccines.Frontiers in immunology · 2020Review
- Safety and Immunogenicity of a Novel Recombinant Simian Adenovirus ChAdOx2 as a Vectored Vaccine.Vaccines · 2019Article
- Adenoviral Type 35 and 26 Vectors with a Bidirectional Expression Cassette in the E1 Region Show an Improved Genetic Stability Profile and Potent Transgene-Specific Immune Response.Human gene therapy · 2018Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
12 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Preexisting immunity to adenovirus serotype 5 (Ad5) diminishes immune responses to vaccines using Ad5 as a vector. Alternate Ad serotypes as vaccine vectors might overcome Ad5-specific neutralizing antibodies and enhance immune responses in populations with a high prevalence of Ad5 immunity. To test this hypothesis, healthy human immunodeficiency virus (HIV)-seronegative adults were enrolled in a blinded, randomized, dose-escalating, placebo-controlled study. In part A, subjects with baseline Ad6 titers of < or = 18 received the Merck Ad6 (MRKAd6) HIV type 1 (HIV-1) trigene vaccine at weeks 0, 4, and 26. In part B, subjects stratified by Ad5 titers (< or = 200 or >200) and Ad6 titers (< or = 18 or >18) received the MRKAd5-plus-MRKAd6 (MRKAd5+6) HIV-1 trigene vaccine at weeks 0, 4, and 26. Immunogenicity was assessed by an enzyme-linked immunospot (ELISPOT) assay at week 30. No serious adverse events occurred. MRKAd6 trigene vaccine recipients responded more often to Nef than to Gag or Pol. In part A, ELISPOT response rates to > or = 2 vaccine antigens were 14%, 63%, and 71% at 10(9), 10(10), and 10(11) viral genomes (vg)/dose, respectively. All responders had positive Nef-specific ELISPOT results. In part B, Nef-ELISPOT response rates at 10(10) vg/dose of the MRKAd5+6 trigene vaccine were 50% in the low-Ad5/low-Ad6 stratum (n = 8), 78% in the low-Ad5/high-Ad6 stratum (n = 9), 75% in the high-Ad5/low-Ad6 stratum (n = 8), and 44% in the high-Ad5/high-Ad6 stratum (n = 9). The MRKAd6 and MRKAd5+6 trigene vaccines elicited dose-dependent responses predominantly to Nef and were generally well tolerated, indicating that Ad6 should be considered a candidate vector for future vaccines. Although small sample sizes limit the conclusions that can be drawn from this exploratory study, combining two Ad vectors may be a useful vaccine strategy for circumventing isolated immunity to a single Ad serotype.
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