ArticleVaccine: X2023
Longitudinal long COVID symptoms in Japanese patients after COVID-19 vaccinations.
Article in Vaccine: X, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 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.
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Who cites it
6 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Evidence on the associations and safety of COVID-19 vaccination and post COVID-19 condition: an updated living systematic review.Epidemiology and infection · 2025Pooled it
- A comparison of Gam-COVID-Vac vaccination and non-vaccination on neurological symptoms and immune response in post-COVID-19 syndrome.Qatar medical journal · 2025Article
- Anxiety, depression, and fear after coronavirus disease 2019 infection and their association with long coronavirus disease symptoms.Frontiers in psychiatry · 2025Article
- Japanese nationwide survey to track the impact of long COVID over 3 years.Environmental health and preventive medicine · 2025Article
- Translating insights into therapies for Long Covid.Science translational medicine · 2024Review
- Cluster analysis of long COVID in Japan and association of its trajectory of symptoms and quality of life.BMJ open respiratory research · 2024Article
Corrections and comments
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Authors and funding
43 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
We conducted a subgroup analysis of a study on the long-term effects of COVID-19 (long COVID) in Japan to assess the effect of vaccination on long COVID symptoms. We assessed the clinical course of 111 patients with long COVID at the time of vaccination. The follow-up period was one year from the onset of COVID-19 or until the administration of the third vaccine dose. Of the 111 patients, 15 (13.5%) reported improvement, four (3.6%) reported deterioration, and 92 (82.9%) reported no change in their long COVID symptoms after vaccination. The most common long COVID symptoms before vaccination were alopecia, dyspnea, muscle weakness, fatigue, and headache among participants whose symptoms improved. Reduced dyspnea and alopecia were the most frequently reported improvements in symptoms after vaccination. Some symptoms persisted, including sleep disturbance, myalgia, and hypersensitivity. Vaccination did not appear to have a clinically important effect on patients with long COVID symptoms.
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Registered trials
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