Trial reportInternational journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases2024
Randomised immunogenicity trial comparing 2019-2020 recombinant and egg-based influenza vaccines among frequently vaccinated healthcare personnel in Israel.
Trial report in International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT04523324 (Randomized Comparison of the Immunogenicity of Recombinant and Egg-based Influenza Vaccines Among Healthcare Personnel in Israel), 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.
Randomized Comparison of the Immunogenicity of Recombinant and Egg-based Influenza Vaccines Among Healthcare Personnel in Israel
Who cites it
4 citing papers in PubMed.
- Comparison of the immunogenicity of adjuvanted and conventional egg-based quadrivalent influenza vaccines among healthcare personnel in Lima, Peru: A randomized controlled trial.International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases · 2026Trial
- Strain-specific differences in the response to egg-derived versus recombinant protein influenza vaccines.Journal of virology · 2026Article
- Strain-specific differences in the response to egg-derived versus recombinant protein influenza vaccines.bioRxiv : the preprint server for biology · 2026Article
- H3 hemagglutinin proteins optimized for 2018 to 2022 elicit neutralizing antibodies across panels of modern influenza A(H3N2) viruses.Journal of immunology (Baltimore, Md. : 1950) · 2025Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
20 authors.
Funding
Abstract
objectivesTrivalent inactivated influenza vaccine effectiveness was low in a prospective cohort of healthcare personnel (HCP) in Israel from 2016 to 2019. We conducted a randomised immunogenicity trial of quadrivalent recombinant influenza vaccine (RIV4) and standard-dose inactivated influenza vaccine (IIV4) among frequently and infrequently vaccinated previous cohort participants.
methodsFrom October 2019 to January 2020, we enrolled and randomly allocated HCP from two Israeli hospitals to receive IIV4 or RIV4. Hemagglutination inhibition (HAI) antibody titres against 2019-2020 vaccine reference influenza viruses were compared between vaccine groups using geometric mean titre (GMT) ratios from sera collected one-month post-vaccination and by frequency of vaccination in the past 5 years (>2 vs ≤2).
resultsAmong 415 HCP, the GMT ratio comparing RIV4 to IIV4 was 2.0 (95% confidence interval [CI] 1.7-2.7) for A(H1N1)pdm09, 1.6 (95% CI: 1.3-1.9) for A(H3N2), 1.8 (95% CI: 1.4-2.2) for B(Yamagata), and 1.1 (95% CI: 0.9-1.4) for B(Victoria). Similarly, RIV4 elicited higher HAI titres than IIV4 against all 2019-2020 vaccine reference viruses except B(Victoria) among infrequently and frequently vaccinated HCP (lower bound of GMT ratio 95% CIs ≥1.0).
conclusionRIV4 had improved immunogenicity for influenza vaccine strains among both infrequent and frequent vaccinees compared to standard-dose IIV4. CLINICAL TRIALS REGISTRATION: NCT04523324.
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