Observational studyActa dermato-venereologica2022
A Nationwide Observational Study of Chlamydia trachomatis Infections in Denmark during the COVID-19 Pandemic.
Observational study in Acta dermato-venereologica, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 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
5 citing papers in PubMed, 7 citations in OpenAlex.
- Changing epidemiology of reproductive tract infections in Western China: a three-phase retrospective study during the COVID-19 pandemic.BMC infectious diseases · 2026Article
- Uptake, positivity, and equity of online postal self-sampling for chlamydia testing in England: a retrospective cohort study.The Lancet regional health. Europe · 2025Article
- Screening for STIs: Results of a Health-Promotion Programme in a Portuguese University.Microorganisms · 2024Article
- [Sexually transmitted infections under the influence of the COVID-19 pandemic].Dermatologie (Heidelberg, Germany) · 2023Article
- Preterm birth, stillbirth and early neonatal mortality during the Danish COVID-19 lockdown.European journal of pediatrics · 2022Observational
Corrections and comments
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Authors and funding
9 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The aim of this study was to determine whether COVID-19 restrictions had an impact on Chlamydia trachomatis infections compared with 2018 and 2019. A retrospective nationwide observational study was performed using monthly incidences of laboratory-confirmed chlamydia cases and number of tests, obtained from Danish national surveillance data. Testing rates and positivity rates were compared using Poisson and logistic regression. The first Danish COVID-19 lockdown (12 March to 14 April 2020) resulted in a reduction in the number of chlamydia tests performed (rate ratio 0.72, 95% confidence interval 0.71-0.73) and a consequent reduction in the number of laboratory-identified cases (66.5 vs 88.3 per 100,000 population during the same period in 2018 to 2019). This period was followed by a return of testing and test positivity close to the level seen in 2018 to 2019. The second Danish COVID-19 lockdown (17 December to 31 March 2021) resulted in crude incidence rates of laboratory-confirmed chlamydia infection that were similar to the crude incidence rates seen during same period in 2018 to 2019. In conclusion, the Danish COVID-19 restrictions have had negligible effects on laboratory-confirmed C. trachomatis transmission.
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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.