Trial reportClinical infectious diseases : an official publication of the Infectious Diseases Society of America2025
Randomized Pragmatic Trial of the Comparative Effectiveness of Chicken Egg-Based Inactivated, Mammalian Cell Culture-Based Inactivated, and Recombinant Protein Quadrivalent Seasonal Influenza Vaccines in United States Military Health System Beneficiaries.
Trial report in Clinical infectious diseases : an official publication of the Infectious Diseases Society of America, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT03734237 (A Pragmatic Assessment of Influenza Vaccine Effectiveness in the DoD), 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.
A Pragmatic Assessment of Influenza Vaccine Effectiveness in the DoD
Who cites it
4 citing papers in PubMed.
- Assessing the relationship between body mass index and influenza-like illness risk and symptom severity among military health system beneficiaries vaccinated against influenza: a pooled prospective cohort study from a randomized trial.Frontiers in public health · 2026Trial
- Participant self-collected versus research coordinator-collected nasal swabs for respiratory viral surveillance following influenza-like illness.Frontiers in public health · 2026Trial
- Influenza-like illness in cigarette smokers and electronic-cigarette users: a secondary analysis from the PAIVED study.Frontiers in public health · 2026Article
- Healthcare Workers Have More Frequent and Less Severe Influenza-Like Illness Than Non-healthcare Workers: Findings From the PAIVED Study.Open forum infectious diseases · 2026Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
33 authors.
Funding
Abstract
backgroundInfluenza is a major cause of morbidity and mortality worldwide. The Pragmatic Assessment of Influenza Vaccine Effectiveness (VE) in the Department of Defense (PAIVED) study compared the relative VE (rVE) of 2 licensed influenza vaccines (cell culture-based inactivated influenza vaccine [ccIIV] and recombinant influenza vaccine [RIV]) to egg-based inactivated influenza vaccine (eIIV).
methodsBetween 2018 and 2021, PAIVED randomized (1:1:1) eligible Military Health System beneficiaries to receive eIIV, ccIIV, or RIV during an influenza season. Participants received weekly surveys querying influenza-like illness (ILI); those reporting ILI completed an online symptom diary, were interviewed by research staff, and underwent nasal swab collection. Laboratory-confirmed influenza was the primary outcome. Immunogenicity assessment was conducted in a subset of participants.
resultsAmong 15 432 participants, influenza was identified in 87/5130 (1.7%) ccIIV recipients, 79/5154 (1.5%) RIV recipients, and 69/5148 (1.3%) eIIV recipients during their season of enrollment. rVE of ccIIV compared to eIIV was -27% (95% confidence interval [CI], -73%, 8%), and rVE of RIV compared to eIIV was -14% (95% CI -58%, 17%). RIV (N = 375) recipients were more likely to seroconvert (4-fold increase) than those who received eIIV (N = 355) (A/H1N1: 49.1% vs 29.0%; A/H3N2: 71.2% vs 30.4%; B/Victoria 24.5% vs 13.8%; B/Yamagata 17.1% vs 5.4%; P < .001 for all). ccIIV (N = 357) recipients were more likely to seroconvert only against A/H3N2 compared with eIIV recipients (44.0% vs 30.4%) (P < .001).
conclusionsSignificant differences in VE were not detected comparing egg-based to non-egg-based influenza vaccines, although immunogenicity differences were observed; low influenza case numbers impacted VE estimate precision.
trial registrationClinicalTrials.gov NCT03734237.
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