ArticleMedicine2026
Long-term adverse effects following COVID-19 vaccination: A comparative analysis of Oxford AstraZeneca, Pfizer-BioNTech, and Moderna vaccines.
Article in Medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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
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Authors and funding
2 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
During the COVID-19 pandemic, vaccinations were highly beneficial to public health, preventing disease and reducing mortality. This study aimed to investigate long-term adverse clinical symptoms following COVID-19 vaccination with the Oxford AstraZeneca (ChAdOx1 nCoV-19, Oxford), Pfizer-BioNTech (BNT162b2), and Moderna (mRNA-1273) vaccines. In this cross-sectional study, the total number of participants was 429; among them, 243 (56.6%) were male, and 186 (43.4%) were female. An online Google Form was prepared in both Arabic and English and distributed to participants who received the Oxford AstraZeneca, Pfizer-BioNTech, and Moderna vaccines. The most common long-term adverse effects reported after COVID-19 vaccination were chronic fatigue, impaired cognitive function, and menstrual irregularity. The Moderna vaccine had a higher self-reported symptom rate among male participants (50-61.5%) than among female participants (33.3-28%). Chronic fatigue was more frequent among Oxford AstraZeneca recipients (34.7%) than among Moderna (22.2%) and Pfizer-BioNTech (27.7%) recipients. The second dose was associated with slightly higher rates of chronic fatigue among Oxford AstraZeneca recipients (38.9%) than among Moderna (25%) and Pfizer-BioNTech recipients (27.3%). For cognitive problems, the prevalence was similar across all brands (25%). Menstrual irregularity was slightly higher among females who received Pfizer-BioNTech (14.8%) than among Oxford AstraZeneca recipients (18.9%). The highest proportion of recipients who were infected after vaccination was among those who received the Oxford AstraZeneca vaccine (46.3%). In conclusion, the most commonly reported long-term adverse effects after COVID-19 vaccination were chronic fatigue, cognitive impairment, and menstrual irregularity. Further large-scale studies are required to provide more conclusive evidence.
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