ArticleScientific reports2023
Reinfection rate in a cohort of healthcare workers over 2 years of the COVID-19 pandemic.
Article in Scientific reports, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 45 papers, 6 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
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.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
45 citing papers in PubMed, 6 syntheses or guidelines pooled it, 93 citations in OpenAlex.
- SARS-CoV-2 infection rates and associated risk factors in healthcare workers: systematic review and meta-analysis.Scientific reports · 2025Pooled it
- Incidence, severity, risk factors and outcomes of SARS-CoV-2 reinfections during the Omicron period: a systematic review and meta-analysis.Journal of global health · 2025Pooled it
- How does the SARS-CoV-2 reinfection rate change over time? The global evidence from systematic review and meta-analysis.BMC infectious diseases · 2024Pooled it
- Incidence and outcome of SARS-CoV-2 reinfection in the pre-Omicron era: A global systematic review and meta-analysis.Journal of global health · 2023Pooled it
- SARS-CoV-2 Reinfection and Severity of the Disease: A Systematic Review and Meta-Analysis.Viruses · 2023Pooled it
- Severity and Outcomes of SARS-CoV-2 Reinfection Compared with Primary Infection: A Systematic Review and Meta-Analysis.International journal of environmental research and public health · 2023Pooled it
- Modeling two-strain competition with reinfection: Mathematical analyses and epidemiological implications.Infectious Disease Modelling · 2026Article
- Article
- Article
- Subsequent SARS-CoV-2 Infection in Healthcare Workers: A Retrospective Cohort Study in Iran.Immunity, inflammation and disease · 2026Article
- Humoral immunity and clinical characteristics of Chinese college students experiencing a BA.5/BF.7 and XBB.1.5 wave.Scientific reports · 2025Article
- Optimal pandemic control strategies and cost-effectiveness of COVID-19 non-pharmaceutical interventions in the United States.BMC global and public health · 2025Article
- Incidence of Recurrent Adverse Cardiovascular Events Among Patients With Acute Myocardial Infarction During the First Wave of the COVID-19 Pandemic in Bangladesh: A Prospective Observational Study.Health science reports · 2025Article
- Article
- Leveraging Large Language Models for Infectious Disease Surveillance-Using a Web Service for Monitoring COVID-19 Patterns From Self-Reporting Tweets: Content Analysis.Journal of medical Internet research · 2025Article
- Amplification of the power of network hubs and degree skewness over infectious disease spread during lulls.PloS one · 2025Article
- Article
- Analysis of COVID-19 reinfection and its influencing factors among primary healthcare workers in Jiangsu Province: a study based on the omicron variant epidemic.Frontiers in public health · 2025Article
- Incidence of SARS-CoV-2 reinfection among blood donors from two Brazilian states in the post-vaccination period: a prospective cohort study.Revista do Instituto de Medicina Tropical de Sao Paulo · 2025Article
- Comparing personality traits of healthcare workers with and without long COVID: Cross-sectional study.PCN reports : psychiatry and clinical neurosciences · 2024Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
13 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
In this large cohort of healthcare workers, we aimed to estimate the rate of reinfections by SARS-CoV-2 over 2 years of the COVID-19 pandemic. We investigated the proportion of reinfections among all the cases of SARS-CoV-2 infection from March 10, 2020 until March 10, 2022. Reinfection was defined as the appearance of new symptoms that on medical evaluation were suggestive of COVID-19 and confirmed by a positive RT-PCR. Symptoms had to occur more than 90 days after the previous infection. These 2 years were divided into time periods based on the different variants of concern (VOC) in the city of São Paulo. There were 37,729 medical consultations due to COVID-19 at the hospital's Health Workers Services; and 25,750 RT-PCR assays were performed, of which 23% (n = 5865) were positive. Reinfection by SARS-CoV-2 was identified in 5% (n = 284) of symptomatic cases. Most cases of reinfection occurred during the Omicron period (n = 251; 88%), representing a significant increase on the SARS-CoV-2 reinfection rate before and during the Omicron variant period (0.8% vs. 4.3%; p < 0.001). The mean interval between SARS-CoV-2 infections was 429 days (ranged from 122 to 674). The Omicron variant spread faster than Gamma and Delta variant. All SARS-CoV-2 reinfections were mild cases.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.