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Open research questions in SARS-CoV-2 and COVID-19 Research

1,608 gap statements mined from SARS-CoV-2 and COVID-19 Research papers in our 7.9M-paper local library, which holds 6,806 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.

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What the literature leaves open

  • The study did not establish a definitive aetiology for severe acute hepatitis of unknown origin (AHUO) in children. The study relied on scRNA-seq data from published work.

    Age-dependent differences in SARS-CoV-2 entry-factor expression and innate immune responses between pediatric and adult liver organoids · 2026 · DOI

  • Further studies are needed to explore the possible role of SARS-CoV-2 in pediatric acute hepatitis. Research should investigate the mechanisms underlying the higher susceptibility of children to SARS-CoV-2-related liver injury. Studies should examine the effects of SARS-CoV-2 infection on liver tissue in different age groups.

    Age-dependent differences in SARS-CoV-2 entry-factor expression and innate immune responses between pediatric and adult liver organoids · 2026 · DOI

  • The lack of understanding of the immunological basis of BA.3.2.2 infection in children. The need to investigate the role of immune imprinting in the efficacy of neutralizing antibodies against BA.3.2.2.

    Lack of ancestral SARS-CoV-2 imprinting promotes Omicron sublineage BA.3.2.2 infection in children · 2026 · DOI

  • There is limited evidence on documented SARS-CoV-2 RT-PCR outcomes and responses to inactivated COVID-19 vaccines in patients with hematologic diseases. The study seeks to address this gap by analyzing the clinical outcomes of COVID-19 infection and immune responses in this population.

    Study on the clinical outcomes of COVID-19 infection and immune responses following the third booster dose of inactivated COVID-19 vaccine in hematologic disease patients · 2026 · DOI

  • There is a need to evaluate the immune response to SARS-CoV-2 vaccination in breast cancer patients undergoing active treatment.

    Immunogenicity of SARS-CoV-2 mRNA Vaccine in Breast Cancer Patients Undergoing Active Treatment: A Prospective Observational Study · 2025 · DOI

  • The need for personalized vaccination strategies based on individual antibody profiles and immune status. The lack of studies applying the concept of surrogate correlates of protection to estimate specific booster timings.

    Estimating the Optimal COVID-19 Booster Timing Using Surrogate Correlates of Protection: A Longitudinal Antibody Study in Naïve and Previously Infected Individuals · 2025 · DOI

  • The existence of an alternative binding pathway between SARS-CoV-2 S1 protein and integrins is not well understood. The strength of the integrin-S1 interaction is not well characterized. The percentage of S1 molecules capable of initiating integrin-mediated adhesion is not known.

    Kinetic Analysis of SARS-CoV-2 S1–Integrin Binding Using Live-Cell, Label-Free Optical Biosensing · 2025 · DOI

  • The lack of particular antivirals for SARS-CoV-2. The need for complementary and alternative medicine as a potential remedy for SARS-CoV-2. The need to understand the mechanistic role of UDE against SARS-CoV-2 recombinant S protein-mediated oxidative stress and mitochondriopathy.

    Ultradiluted Eupatorium perfoliatum Prevents and Alleviates SARS-CoV-2 Spike Protein-Induced Lung Pathogenesis by Regulating Inflammatory Response and Apoptosis · 2025 · DOI

  • The study also faced challenges in measuring immune responses, with the need to develop and validate assays for anti-SARS-CoV-2 IgG and neutralizing antibodies.

    Lifestyle and Biochemical Parameters That May Hamper Immune Responses in Pediatric Patients After Immunization with the BNT162b2 mRNA COVID-19 Vaccine · 2025 · DOI

  • The impact of lifestyle and biochemical parameters on immune responses to COVID-19 vaccination in pediatric populations is not well understood. Prior studies have not fully investigated the relationship between obesity and immune responses to COVID-19 vaccination.

    Lifestyle and Biochemical Parameters That May Hamper Immune Responses in Pediatric Patients After Immunization with the BNT162b2 mRNA COVID-19 Vaccine · 2025 · DOI

  • Immunocompromised individuals may have a reduced antibody response after vaccination, and this insufficient immune response in COVID-19 individuals might contribute to the pathophysiology of MS.

    Effects of Drugs for the Treatment of Multiple Sclerosis in Severe Acute Respiratory Syndrome Coronavirus 2 Infection on the Expression of Angiotensin-converting Enzyme 2 in vitro · 2026 · DOI

  • In contrast, hACE2 expression limited to endothelial cells was insufficient to promote SARS-CoV-2 replication in the lung or cause pathology.

    Differential effects of SARS-CoV-2-targeted infection of ATII, club cells, and macrophages on lung immunopathology and antiviral responses · 2026 · DOI

  • The specific contributions of lung epithelial and immune cells to SARS-CoV-2–induced immunopathology and antiviral responses remain unclear.

    Differential effects of SARS-CoV-2-targeted infection of ATII, club cells, and macrophages on lung immunopathology and antiviral responses · 2026 · DOI

  • We also sought to estimate vaccine efficacy against covid-19 hospitalization, a clinically meaningful and public health relevant measure of potential protection against serious disease that has not been reported.

    Transparency of clinical trials: Reproducing and extending analyses · 2026 · DOI

  • The nose and mouth are the primary entry points for upper respiratory severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection; however, the influence of different entry routes on viral spread remains unclear.

    Oral SARS-CoV-2 inoculation leads to distinct viral distribution compared to nasal inoculation in a Syrian hamster model · 2026 · DOI

  • While extensive research has examined the neuroinvasiveness of SARS-CoV-2, its relationship with brain maturation remains unclear.

    Brain corticogenesis promotes SARS-CoV-2 neuro-glial tropism through lipid-dependent viral replication · 2026 · DOI

  • The extent of cross-reactive antibodies to SARS-CoV-2 elicited by seasonal human coronaviruses (HCoVs) remains unclear.

    Cross‐Reactive IgG Antibody Responses to SARS‐CoV‐2 in Older Adults Following Seasonal Coronavirus Infection in Jiangsu, China (2015–2017) · 2026 · DOI

  • Other priming events showed mixed associations, with a lack of evidence of stronger protection from more recent immune-priming events.

    Immune Priming and the Risk of COVID‐19, Influenza, and Other Acute Respiratory Infections: Insights From an N3C Cohort · 2026 · DOI

  • Whether minor antigen changes provide immunological or even clinical benefit remains unclear.

    Comparable Neutralizing Antibody Responses Following JN.1 and KP.2‐Based COVID‐19 Vaccination Suggest Limited Added Value of Minor Strain Updates: A Multicentre Immunogenicity Study · 2026 · DOI

  • Although C3d can modulate B cell responses through complement receptor 2 (CR2) in experimental systems, it remains unclear how circulating C3d relates to antibody responses after SARS-CoV-2 infection in humans.

    C3d Complement Activation and Antibody Immunity in Convalescent COVID‐19: Insights From Adults and Children · 2026 · DOI

  • The researchers had to adjust for age, sex, testing interval, and disease group in the vaccination analyses. The study's findings were limited by the relatively small numbers of participants in some of the analyses.

    Study on the clinical outcomes of COVID-19 infection and immune responses following the third booster dose of inactivated COVID-19 vaccine in hematologic disease patients · 2026 · DOI

  • Aging remodels antiviral immunity, yet its influence on responses to repeated mRNA vaccination is not fully defined.

    Immunosenescence and cytomegalovirus-associated immune signatures on severe acute respiratory syndrome coronavirus 2 booster responses · 2026 · DOI

  • Traditional methods have limitations, - RT-qPCR can produce false positives and negatives, - Antigen detection methods have lower sensitivity, - The detection of viral nucleic acids needs to be performed in the early stages of a patient's viral…

    Advances in Virus Biorecognition and Detection Techniques for the Surveillance and Prevention of Infectious Diseases · 2025 · DOI

  • The study identifies a gap in understanding the antibody concentrations in healthcare workers against SARS-CoV-2. Each country established different surveillance, treatment, and control strategies, resulting in heterogeneity in the pandemic's impact.

    Titers of IgG, IgM, and IgA Against SARS-CoV-2 in Healthcare Workers from a General Hospital in Mexico City · 2025 · DOI

  • In summary, these findings not only substantiate METTL3 as a viable antiviral target but also lay the foundation for further research on the therapeutic potential of onvansertib and vilazodone against COVID-19.

    Onvansertib and vilazodone inhibit SARS-CoV-2 replication via suppression of METTL3 RNA-m6A enzymatic activity · 2026 · DOI

Most-cited papers in SARS-CoV-2 and COVID-19 Research

Most recent work

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Open questions raised by papers listed on this page include: (1) Further studies are needed to explore the possible role of SARS-CoV-2 in pediatric acute hepatitis (“Age-dependent differences in SARS-CoV-2 entry-factor expression and innate…”, 2026); (2) The lack of understanding of the immunological basis of BA.3.2.2 infection in children (“Lack of ancestral SARS-CoV-2 imprinting promotes Omicron sublineage BA.3.2.2…”, 2026); (3) There is limited evidence on documented SARS-CoV-2 RT-PCR outcomes and responses to inactivated COVID-19 vaccines in patients with hematologic diseases (“Study on the clinical outcomes of COVID-19 infection and immune responses…”, 2026); (4) The specific contributions of lung epithelial and immune cells to SARS-CoV-2–induced immunopathology and antiviral responses remain unclear (“Differential effects of SARS-CoV-2-targeted infection of ATII, club cells, and…”, 2026); (5) The nose and mouth are the primary entry points for upper respiratory severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection; however, the influence of different entry routes on viral spread remains unclear (“Oral SARS-CoV-2 inoculation leads to distinct viral distribution compared to…”, 2026). 1,608 gap statements have been mined from SARS-CoV-2 and COVID-19 Research papers in our 7.9M-paper local library, which holds 6,806 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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