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Updated: Dec 4, 2025

Author Spotlight: Advancements in Multiplex Detection of Respiratory Viruses
Published on: November 10, 2023
Research response to coronavirus disease 2019 needed better coordination and collaboration: a living mapping of
Van Thu Nguyen1, Philippe Rivière2, Pierre Ripoll3
1Université de Paris, Centre of Research Epidemiology and Statistics (CRESS), Inserm, F-75004 Paris, France; Cochrane France, AP-HP, 75004 Paris, France.
Objectives:
Researchers worldwide are actively engaging in research activities to search for preventive and therapeutic interventions against coronavirus disease 2019 (COVID-19). Our aim was to describe the planning of randomized controlled trials (RCTs) in terms of timing related to the course of the COVID-19 epidemic and research question evaluated.
Study Design And Setting:
We performed a living mapping of RCTs registered in the WHO International Clinical Trials Registry Platform. We systematically search the platform every week for all RCTs evaluating preventive interventions and treatments for COVID-19 and created a publicly available interactive mapping tool at https://covid-nma.com to visualize all trials registered.
Results:
By August 12, 2020, 1,568 trials for COVID-19 were registered worldwide. Overall, the median ([Q1-Q3]; range) delay between the first case recorded in each country and the first RCT registered was 47 days ([33-67]; 15-163). For the 9 countries with the highest number of trials registered, most trials were registered after the peak of the epidemic (from 100% trials in Italy to 38% in the United States). Most trials evaluated treatments (1,333 trials; 85%); only 223 (14%) evaluated preventive strategies and 12 postacute period intervention. A total of 254 trials were planned to assess different regimens of hydroxychloroquine with an expected sample size of 110,883 patients.
Conclusion:
This living mapping analysis showed that COVID-19 trials have relatively small sample size with certain redundancy in research questions. Most trials were registered when the first peak of the pandemic has passed.
Insights
Most COVID-19 randomized controlled trials (RCTs) were registered after the pandemic
Area of Science:
- Clinical Research
- Epidemiology
- Public Health
Background:
- Global research efforts focused on finding COVID-19 interventions.
- Understanding the landscape of clinical trials is crucial for effective pandemic response.
Purpose of the Study:
- To analyze the planning and timing of COVID-19 randomized controlled trials (RCTs).
- To evaluate the research questions addressed by registered COVID-19 trials in relation to epidemic progression.
Main Methods:
- A living mapping of RCTs was conducted using the WHO International Clinical Trials Registry Platform.
- Weekly searches identified all registered RCTs for COVID-19 interventions.
- An interactive online tool was developed to visualize trial data.
Main Results:
- By August 12, 2020, 1,568 COVID-19 RCTs were registered globally.
- The median delay between the first case and first RCT registration was 47 days.
- Most trials focused on treatments (85%) rather than prevention (14%), with many registered after the epidemic peak.
- A significant number of trials investigated hydroxychloroquine.
Conclusions:
- COVID-19 trials often had small sample sizes and overlapping research questions.
- The majority of trials commenced after the initial peak of the pandemic, suggesting a delayed research response.
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