ArticleBMJ (Clinical research ed.)2024
Optimal timing of influenza vaccination in young children: population based cohort study.
Article in BMJ (Clinical research ed.), 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the 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.
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Who cites it
4 citing papers in PubMed, 4 citations in OpenAlex.
- Article
- Time of Day of Influenza Vaccination and Subsequent Influenza Risk.JAMA network open · 2026Article
- Intraseasonal waning of influenza vaccine effectiveness and implications for the optimal timing of seasonal vaccination programs: A scoping review.Canada communicable disease report = Releve des maladies transmissibles au Canada · 2026Article
- Influenza vaccine effectiveness against medically-attended influenza infection in 2023/24 season in Hangzhou, China.Human vaccines & immunotherapeutics · 2025Article
Corrections and comments
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Authors and funding
3 authors at 2 institutions in 1 country.
Funding
Abstract
objectiveTo assess optimal timing of influenza vaccination in young children.
designPopulation based cohort study.
settingUnited States.
participantsCommercially insured children aged 2-5 years who were vaccinated against influenza during 2011-18.
main outcome measureRates of diagnosis of influenza among children who were vaccinated against influenza, by birth month.
resultsOverall, 819 223 children aged 2-5 received influenza vaccination. Children vaccinated in November and December were least likely to have a diagnosis of influenza, a finding that may be confounded by unmeasured factors that influence the timing of vaccination and risk of influenza. Vaccination commonly occurred on days of preventive care visits and during birth months. Children born in October were disproportionately vaccinated in October and were, on average, vaccinated later than children born in August and earlier than those born in December. Children born in October had the lowest rate of influenza diagnosis (for example, 2.7% (6016/224 540) versus 3.0% (6462/212 622) for those born in August; adjusted odds ratio 0.88, 95% confidence interval 0.85 to 0.92).
conclusionsIn a quasi-experimental analysis of young children vaccinated against influenza, birth month was associated with the timing of vaccination through its influence on the timing of preventive care visits. Children born in October were most likely to be vaccinated in October and least likely to have a diagnosis of influenza, consistent with recommendations promoting October vaccination.
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Registered trials
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