Vaccines substantially mitigated the impacts of the covid-19 pandemic worldwide, saving millions of lives. The pandemic has, however, left a substantial global prevalence of a post-viral syndrome, called post-covid-19 condition or long covid. Post-covid-19 condition is defined as persistent symptoms at three months from the onset of covid-19, with symptoms that have lasted for at least two months. At least 200 million individuals are affected, and the protective value of covid-19 vaccines remains uncertain, with reported estimates ranging from a 13% to a 52% reduction in risk. Most of these studies relied on self-reported symptoms of post-covid-19 condition rather than a clinical diagnosis using ICD-10 (international classification of diseases, 10th revision) coding.


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Sivan, M., Ormerod, M. & Maini, R. 2023, 'Does timely vaccination help prevent post-viral conditions?', The BMJ, 383, pp. 2633-2633. https://doi.org/10.1136/bmj.p2633

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Last updated: 18 January 2024
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