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Open research questions in COVID-19 Clinical Research Studies

707 gap statements mined from COVID-19 Clinical Research Studies papers in our 7.9M-paper local library, which holds 4,545 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

Choosing where to publish on COVID-19 Clinical Research Studies? See the ranked Medicine journals.

What the literature leaves open

  • The need for a better understanding of the prognostic value of myocardial injury in severe or critical COVID-19.

    Myocardial Injury and Predictors of In-Hospital Mortality in Severe or Critical COVID-19: A Single-Center Observational Cohort Study · 2026 · DOI

  • There is a need to investigate the diagnostic value of semi-quantitative CT scoring systems in predicting COVID-19 patient outcomes. The correlation of the scoring system with laboratory parameters and pulmonary function is not well understood.

    Evaluation of an Established Semi-Quantitative Chest CT Scoring System for Assessing the Severity of COVID-19 Pneumonia: What Is Its Diagnostic Value Regarding Patient Outcomes? · 2026 · DOI

  • The use of procalcitonin in COVID-19 is still controversial, especially in hospitals lacking routine microbiological facilities. There is a need to describe procalcitonin patterns in hospitalized COVID-19 patients.

    Procalcitonin Patterns at Admission and Discharge in Moderate and Severe Hospitalised COVID-19: A Single-Centre Retrospective Study · 2026 · DOI

  • Prior studies have focused on specific populations and short timeframes. There is a need to evaluate the burden of COVID-19 cases in Colombia and associations with demographic and clinical characteristics. The study aims to fill this gap by providing insights into the clinical and demographic characteristics of COVID-19 cases during the first 35 months since its appearance in Colombia.

    Burden in Colombia of COVID-19 in Adults and the Associated Clinical Characteristics: A Retrospective Database Analysis · 2025 · DOI

  • There is a need to control for potential confounding variables. The study requires careful consideration of the study design and statistical analysis to ensure valid conclusions.

    The Factors Influencing the Incidence, Persistence, and Severity of Symptoms After SARS-CoV-2 Infection in Chinese Adults: A Case–Control Study · 2025 · DOI

  • There is a need to elucidate the factors influencing the incidence, persistence, and severity of SARS-CoV-2 symptoms. The study aims to address this gap by analyzing data from a national COVID-19 surveillance program.

    The Factors Influencing the Incidence, Persistence, and Severity of Symptoms After SARS-CoV-2 Infection in Chinese Adults: A Case–Control Study · 2025 · DOI

  • The differentiation between COVID-19 and other influenza-like illnesses is a challenge when access to specific diagnostics for each virus is limited. The non-specific clinical characteristics of these diseases make diagnosis difficult.

    COVID-19 Clinical Predictors in Patients Treated via a Telemedicine Platform in 2022 · 2025 · DOI

  • The seasonal distribution of viral infections has changed during the COVID-19 pandemic. There is a need to determine the frequency and seasonal distribution of viral pneumonia pathogens after COVID-19.

    Seasonal Distribution of Viral Pneumonia After COVID-19 and the Role of Hematological Markers in Assessing Pneumonia Severity: A Case–Control Study · 2025 · DOI

  • Real-world cohorts from Eastern European intensive care during the pre-vaccination period are scarce.

    Admission Acute Brain Dysfunction and In-ICU Mortality in a Single-Center Pre-Vaccination Romanian COVID-19 Cohort:A Retrospective Observational Analysis. · 2026 · DOI

  • Both donepezil and metformin have anti-inflammatory effects and are associated with improved outcomes in respiratory viral infections, but whether their combined use is associated with lower COVID-19 mortality remains unknown.

    Potential Synergistic Association of Donepezil and Metformin With COVID-19 Mortality in Dementia Patients · 2026 · DOI

  • Dyslipidemia is common in severe COVID-19, but the prognostic significance of standard lipid parameters remains incompletely defined.

    Elevated triglycerides predict increased mortality in patients with severe COVID-19 - An observational study · 2026 · DOI

  • The association of COVID-19 and mortality in hospitalizations with coronary artery bypass graft (CABG) has not been determined.

    The Association of COVID-19 and Mortality in Hospitalizations With Coronary Artery Bypass Graft · 2025 · DOI

  • The impact of COVID-19 in Argentina's health and economic outcomes before the implementation of the national vaccination plan has not been fully characterized.

    Disease and Economic Burden of COVID-19 in the Prevaccine Era in a Fragmented Health System: The Argentine Case · 2025 · DOI

  • Yet, the innate immune response, including cytokines, chemokines, adenosine deaminases (ADAs) and Toll-like receptors (TLRs), relevant to COVID-19 remain incompletely characterized.

    Patients Hospitalized with COVID-19 Demonstrate Distinct Plasma Cytokine and Chemokine Concentrations in vivo and TLR-Mediated Cytokine and Chemokine Production in Whole Blood in vitro · 2025 · DOI

  • The lack of significant increase in mortality for centenarians is notable and warrants further study to identify possible protective factors in this unique population.

    Mortality Trends in Pre-COVID-19 and COVID-19 Eras Among Oldest Veterans · 2025 · DOI

  • A review of the performance of routine biomarkers in pandemic-era cohorts is necessary, - Studies of renal, endothelial and cardiovascular complications in COVID-19 survivors…

    Procalcitonin Patterns at Admission and Discharge in Moderate and Severe Hospitalised COVID-19: A Single-Centre Retrospective Study · 2026 · DOI

  • Limited sample size, - Sparse outcome events, - Potential residual confounding, - Non-contemporaneous treatment groups due to the availability of remdesivir before…

    Nirmatrelvir/Ritonavir Versus Remdesivir Therapy for Severe Acute Respiratory Syndrome Coronavirus 2 Infection in Kidney Transplant Recipients: A Retrospective Study · 2026 · DOI

  • The study identifies a gap in understanding the impact of age on cardiovascular complications and mortality in COVID-19 patients. It aims to assess the relationship between age and cardiovascular outcomes in hospitalized COVID-19 patients.

    Cardiovascular Outcomes in Hospitalized Patients with COVID-19: Does Age Really Matter? · 2025 · DOI

  • Investigating the impact of antimicrobial resistance on COVID-19 outcomes, - Examining the effectiveness of different treatment regimens, - Studying the role of bacterial superinfections in COVID-19…

    Bacterial Superinfections After SARS-CoV-2 Pneumonia: Antimicrobial Resistance Patterns, Impact on Inflammatory Profiles, Severity Scores, and Clinical Outcomes · 2025 · DOI

  • The study identifies the challenge of understanding the impact of new mutations on pediatric COVID-19. The research also references the challenge of healthcare systems remaining vigilant in the face of emerging variants.

    SARS-CoV-2 Variants and Their Impact on Pediatric COVID-19: Clinical Manifestations and Hematological Profiles · 2025 · DOI

  • The study identifies a gap in the understanding of the impact of SARS-CoV-2 variants on pediatric COVID-19. The research aims to fill this gap by analyzing the clinical manifestations and hematological profiles of children with COVID-19.

    SARS-CoV-2 Variants and Their Impact on Pediatric COVID-19: Clinical Manifestations and Hematological Profiles · 2025 · DOI

  • Further studies are needed to validate the findings, - Research on the effectiveness of telehealth services in anticipating new COVID-19 waves is needed, - Studies on the dynamics of the epidemic and the surveillance of different diseases using telehealth service data…

    COVID-19 Clinical Predictors in Patients Treated via a Telemedicine Platform in 2022 · 2025 · DOI

  • Further studies are needed to determine the seasonal distribution of viral pathogens in different populations, - Research on the relationship between hematological indices and disease severity is necessary, - Investigations on the effectiveness of the Pneumonia Severity Index (PSI) in different settings…

    Seasonal Distribution of Viral Pneumonia After COVID-19 and the Role of Hematological Markers in Assessing Pneumonia Severity: A Case–Control Study · 2025 · DOI

  • The study identifies a gap in the understanding of the predictive markers for COVID-19 prognosis. The study aims to evaluate the prognostic value of the Brixia radiological score in COVID-19 patients. The study claims to contribute to the understanding of the role of vaccination in reducing the severity of radiological lesions.

    Prognostic Value of the Brixia Radiological Score in COVID-19 Patients: A Retrospective Study from Romania · 2025 · DOI

  • Further studies are needed to compare the effectiveness and safety of nirmatrelvir/ritonavir and remdesivir in a larger population of kidney transplant recipients, - Research should focus on adjusting for potential confounding variables and considering the timing of treatment…

    Nirmatrelvir/Ritonavir Versus Remdesivir Therapy for Severe Acute Respiratory Syndrome Coronavirus 2 Infection in Kidney Transplant Recipients: A Retrospective Study · 2026 · DOI

Most-cited papers in COVID-19 Clinical Research Studies

Most recent work

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Open questions raised by papers listed on this page include: (1) There is a need to investigate the diagnostic value of semi-quantitative CT scoring systems in predicting COVID-19 patient outcomes (“Evaluation of an Established Semi-Quantitative Chest CT Scoring System for…”, 2026); (2) There is a need to describe procalcitonin patterns in hospitalized COVID-19 patients (“Procalcitonin Patterns at Admission and Discharge in Moderate and Severe…”, 2026); (3) Real-world cohorts from Eastern European intensive care during the pre-vaccination period are scarce (“Admission Acute Brain Dysfunction and In-ICU Mortality in a Single-Center…”, 2026); (4) Both donepezil and metformin have anti-inflammatory effects and are associated with improved outcomes in respiratory viral infections, but whether their combined use is associated with lower COVID-19 mortality remains unknown (“Potential Synergistic Association of Donepezil and Metformin With COVID-19…”, 2026); (5) There is a need to evaluate the burden of COVID-19 cases in Colombia and associations with demographic and clinical characteristics (“Burden in Colombia of COVID-19 in Adults and the Associated Clinical…”, 2025). 707 gap statements have been mined from COVID-19 Clinical Research Studies papers in our 7.9M-paper local library, which holds 4,545 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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