Trial reportNature communications2025
Increase in H5N1 vaccine antibodies confers cross-neutralization of highly pathogenic avian influenza H5N1.
Trial report in Nature communications, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT00535665 (The Clinical Trial of Pandemic Influenza Vaccine), which is not on this map. Cited by 4 papers.
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.
The Clinical Trial of Pandemic Influenza Vaccine (Whole-Virion， Inactivated, Adjuvanted) on Healthy Adults by Randomized and Double-Blind Design: a Phase II Study
Who cites it
4 citing papers in PubMed.
- Evaluation of Cross-Immunogenicity of Ferret Antisera Following Immunization with H5N1 Vaccine Strains.Vaccines · 2026Article
- A VLP-based mRNA vaccine elicits potent humoral and cellular immunity against Oropouche virus.mBio · 2026Article
- An H5N1 clade 2.3.4.4b virus vaccine that elicits cross-protective antibodies against conserved domains of H5 and N1 glycoproteins.Nature communications · 2026Article
- Influenza A Virus H5N1 Subtype: Resurgent Interspecies and Intercontinental Transmission, and a New Host.Pathogens (Basel, Switzerland) · 2025Review
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
9 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
H5N1, a highly pathogenic avian influenza virus, presents pandemic risks due to its ability to adapt and spread among mammalian species. Vaccination may control its spread, but the effectiveness of existing H5N1 vaccines against circulating strains, especially clade 2.3.4.4b, remains uncertain. In this study, we assess neutralizing antibody responses to global circulating H5N1 strains, using sera from individuals vaccinated with an inactivated H5N1 vaccine (NCT00535665). Neutralization is measured against 17 pseudoviruses, representing circulating and vaccine H5 strains. Our results indicate that broad protective effects are observed only when high antibody titers are achieved by vaccination. Correlation analysis estimates that a pseudovirus-based neutralization titer of at least 1:980 is required to achieve a cross-protection rate above 60%. The findings suggest that the current H5N1 vaccine can elicit cross-neutralization of circulating H5N1 strains, if high antibody titers are achieved. Until updated H5N1 vaccines are developed, this vaccine may serve as a bridging measure.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.