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Open research questions in Long-Term Effects of COVID-19

276 unresolved questions extracted from the limitations and future-work sections of 832 Long-Term Effects of COVID-19 papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • further research is needed to understand the relationship between long COVID and functional limitations, - studies should investigate the cause of functional limitations in individuals with long COVID, - research should examine the impact of long COVID on functional limitations over time

    Investigating the Variables Associated with Having a Functional Limitation Among Adults with Long COVID: A Cross-Sectional Database Study Using the United States Medical Expenditure Panel Survey · 2026 · DOI

  • Further research is needed to evaluate the long-term effects of ICP components, - Research on the clinical significance of small improvements in fatigue and quality of life is needed, - Studies on the cost-effectiveness of ICP components are necessary

    Integrated care pathway in individuals with Long COVID: STIMULATE-ICP, a cluster-randomized, phase 3 trial · 2026 · DOI

  • The effectiveness of integrated care pathways for Long COVID has not been evaluated. There is a lack of evidence on the impact of multi-organ MRI and digital rehabilitation interventions on fatigue and quality of life in individuals with Long COVID.

    Integrated care pathway in individuals with Long COVID: STIMULATE-ICP, a cluster-randomized, phase 3 trial · 2026 · DOI

  • The gap in current research is the lack of understanding of the underlying mechanisms of cognitive impairment in long-COVID. There is a need to develop preventive and therapeutic interventions for long-COVID patients. The study aims to address this gap by investigating functional connectivity changes in long-COVID patients.

    Altered corticostriatal connectivity in long-COVID patients is associated with cognitive impairment · 2025 · DOI

  • Investigate the role of anti-ACE2 antibodies in neurological autoimmune manifestations - Study the effects of SARS-CoV-2 infection and vaccination on the immune system - Examine the relationship between SARS-CoV-2 and neurological disorders

    Post-SARS-CoV-2 infection and post-vaccine-related neurological complications share clinical features and the same positivity to anti-ACE2 antibodies · 2024 · DOI

  • Further exploration of the biological and psychosocial aspects of mental illness and substance abuse, - Investigation of the specific mechanisms of COVID-19's effects on the brain, - Examination of the impact of COVID-19 on patients with pre-existing mental illness

    COVID-19: ramifications of the pandemic on mental health and substance abuse · 2024 · DOI

  • The underlying causes and mechanisms of the pandemic's impact on mental health and substance abuse are not yet fully understood. There is a need for further exploration of the correlation between COVID-19 and mental health/substance use. The study aims to address this gap by reviewing relevant literature and summarizing findings.

    COVID-19: ramifications of the pandemic on mental health and substance abuse · 2024 · DOI

  • The study faced challenges in defining long COVID diagnosis due to the lack of objective diagnostic tests. The researchers had to account for potential confounders, including socio-demographic factors, vaccination status, and medical comorbidities. The study had to consider the potential for increased healthcare interaction to be associated with higher likelihood of long COVID diagnoses.

    Association of psychiatric disorders with clinical diagnosis of long COVID in US veterans · 2024 · DOI

  • Further studies are needed to understand the underlying mechanisms of long COVID, - Research on the risk factors for long COVID is needed, - Studies on the associations between specific psychiatric disorders and long COVID are required

    Association of psychiatric disorders with clinical diagnosis of long COVID in US veterans · 2024 · DOI

  • Participants who were lost to follow up were more likely to have been hospitalized due to SARS-CoV-2 infection, - The study had a limited sample size of 303 participants, - The study only included participants from Amsterdam, the Netherlands

    Long-term sequelae of SARS-CoV-2 two years following infection: exploring the interplay of biological, psychological, and social factors · 2024 · DOI

  • Further research is needed to understand the underlying mechanisms of persistent symptoms after COVID-19, - Studies should investigate the role of infection-specific factors in the development of persistent symptoms

    Long-term sequelae of SARS-CoV-2 two years following infection: exploring the interplay of biological, psychological, and social factors · 2024 · DOI

  • Elderly individuals and often children suffer disproportionately severe disease, whereas young adults relatively mount protective responses; yet the cellular and molecular determinants of this age-dependent neuroprotection remain poorly characterized.

    CX3CR1+ microglia/macrophages, activated T cells, and IFN-γ-driven stimulation confer age-dependent protective immunity in young-adult mice following β-coronavirus infection. · 2026 · DOI

  • However, there is a gap in the literature on patient-derived recommendations for addressing the psychosocial impacts of living with Long COVID.

    Supporting the psychosocial well-being of patients with Long COVID: patient-informed strategies from a qualitative study · 2026 · DOI

  • The impact of interventions targeting these specific factors should be studied to guide future intervention implementation.

    Supporting the psychosocial well-being of patients with Long COVID: patient-informed strategies from a qualitative study · 2026 · DOI

  • Quantification of these conditions and their impact on the patient’s daily living was scarce in the current literature.

    Neuropsychiatric Manifestations and Their Impact in Post-COVID-19 Condition: A Study in A Tertiary Care Center in Bangladesh · 2026 · DOI

  • However, knowledge regarding the long-term impact of rehabilitation on neuropsychological health of these patients is lacking.

    Course of neuropsychological health in post-COVID patients differs 6 and 12 months after inpatient rehabilitation · 2025 · DOI

  • Background Long COVID in children remains a poorly understood condition with wide variability in clinical presentation, duration, and risk factors.

    Prevalence and duration of clinical symptoms of pediatric long COVID: findings from a one-year prospective study · 2025 · DOI

  • BACKGROUND: In February 2023, the World Health Organization (WHO) defined long COVID in children, highlighting limited knowledge about its psychosocial impact.

    Experiences of living with long COVID during childhood and adolescence: a qualitative study from the child’s perspective · 2025 · DOI

  • BACKGROUND: The Omicron variant has become the predominant strain globally, yet pediatric data on COVID-19-associated acute encephalopathy (AE) remain scarce.

    Clinical characteristics and outcomes of COVID-19-Associated acute encephalopathy in pediatric patients during the Omicron wave in beijing: a single-center prospective study · 2025 · DOI

  • No proven therapies exist to treat LC, and the mechanisms driving disease remain poorly understood.

    Leveraging virus-specific T cells as antigen biosensors to interrogate the pathogenesis of long COVID 3632 · 2025 · DOI

  • Despite its prevalence, the underlying mechanisms and reliable biomarkers remain elusive.

    SARS-CoV-2 spike epitopes as a novel clinically-relevant biomarker for post-COVID syndrome 3558 · 2025 · DOI

  • However, the recovery of immune-cell subsets during convalescence remains incompletely understood.

    Persistent lymphocytopenia in convalescent patients with COVID-19: dysregulated B cell, CD4+ T cell, and treg compartments in 7–12% of moderate-severe cases · 2025 · DOI

  • PURPOSE: Long COVID-19 is a growing public health concern, but its long-term burden and predictors remain underexplored, particularly in underrepresented populations.

    Long COVID-19: a Four-Year prospective cohort study of risk factors, recovery, and quality of life · 2025 · DOI

  • We primarily focused on high-level evidence studies, such as meta-analyses and randomized controlled trials, but observational studies were included when evidence was scarce.

    Therapeutic options for the treatment of post-acute sequelae of COVID-19: a scoping review · 2025 · DOI

  • Early identification of circulating biomarkers predictive of PASC is critical for prognosis and therapeutic development yet remains poorly defined.

    Blood pro-thrombotic analytes and platelet activation are associated with post-acute sequelae of COVID-19 · 2025 · DOI

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276 open questions have been extracted from the limitations and future-work passages of 832 Long-Term Effects of COVID-19 papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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