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Open research questions in Bacterial Infections and Vaccines

522 gap statements mined from Bacterial Infections and Vaccines papers in our 7.9M-paper local library, which holds 1,736 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

  • There is a lack of awareness about the possibility of hemorrhagic brain abscess mimicking an intracranial neoplasm. There is a need for increased recognition of the importance of considering hemorrhagic brain abscess in the differential diagnosis of ring-enhancing lesions. There is a need for more research on the management of hemorrhagic brain abscess, particularly in the setting of IKPS.

    Hemorrhagic brain abscess mimicking an intracranial neoplasm in invasive Klebsiella pneumoniae syndrome: illustrative case · 2026 · DOI

  • The complexity of Neisseria biofilms, which can make it difficult to study eDNA's role. The limited understanding of the mechanisms underlying eDNA's role in Neisseria biofilms. The need for further research on the role of eDNA in nonpathogenic Neisseria species.

    The role of extracellular DNA in Neisseria biofilms · 2026 · DOI

  • The lack of understanding of the mechanisms of matrix component release and incorporation into the biofilm matrix. The limited knowledge of the role of membrane vesicles in gram-positive bacterial biofilms. The need to investigate the contribution of membrane vesicles to biofilm formation and integrity.

    Extracellular membrane vesicles—previously unrecognized components of Staphylococcus aureus biofilms · 2026 · DOI

  • Previous studies have primarily focused on individual strains and lack a comprehensive understanding of the intercellular communication and interactions among spoilage bacteria. The study of extracellular vesicles has garnered significant attention, but there is a need for a comprehensive understanding of their role in intercellular communication.

    Characterization of high-purity Aeromonas salmonicida extracellular vesicles and their inhibitory activity against Pseudomonas fluorescens biofilm formation · 2026 · DOI

  • The lack of understanding of the proteomic composition and immunomodulatory activity of G. adiacens EVs in different lifestyles. The need to characterize EVs from biofilm and planktonic cultures to understand their role in host-pathogen interactions.

    Differential Proteomic Analysis of Extracellular Vesicles Produced by Granulicatella adiacens in Biofilm vs. Planktonic Lifestyle · 2025 · DOI

  • The need to improve investigation efficiency in pertussis case investigations. The challenge of reducing staff workload while maintaining effective public health responses. The difficulty of achieving statistically significant time savings among survey respondents who require further follow-up.

    Evaluation of an Online Survey for Pertussis Case Investigations in Regional Queensland: Impacts on Workload and Disease Trends · 2025 · DOI

  • Comparison of the nature or follow-up actions of individual pertussis cases with control PHUs was not conducted, as this would have required additional data and resources beyond the scope of the evaluation.

    Evaluation of an Online Survey for Pertussis Case Investigations in Regional Queensland: Impacts on Workload and Disease Trends · 2025 · DOI

  • The pathogenesis of cerebrovascular complications secondary to meningitis remains unclear. The mechanism of cortical watershed infarctions following bacterial meningitis is not well understood.

    Multiple cortical watershed infarctions following bacterial meningitis · 2026 · DOI

  • Limited information is available on the demographic and clinical-epidemiological factors associated with Bordetella pertussis infection.

    Epidemiological Distribution and Factors Associated with Bordetella pertussis Infection Among Probable Pertussis Cases in Mexico, 2024–2025 · 2026 · DOI

  • The effectiveness of prophylactic antibiotics for preventing meningitis in patients with closed basilar skull fractures remains controversial.

    Prophylactic antibiotic use in closed basilar skull fractures: A nationwide cohort study · 2025 · DOI

  • Further research into societal costs in young adult survivors of neonatal meningitis is needed to provide additional insights into the economic burden of childhood BM.

    Healthcare and productivity loss costs in young adults after bacterial meningitis: a cross-sectional follow-up study · 2025 · DOI

  • The precise mechanism by which filamentous cell shape is regulated in the ΔdegP and ΔdegPΔamiAb mutants remains unclear. The study does not investigate the role of other factors that may contribute to OMV production.

    Periplasmic crowding and peptidoglycan hydrolase activity as drivers of outer membrane vesiculation in Acinetobacter baumannii · 2026 · DOI

  • The mechanisms of OMV production remain poorly understood. The precise molecular pathways linking periplasmic crowding and PG recycling to OMV biogenesis remain unclear.

    Periplasmic crowding and peptidoglycan hydrolase activity as drivers of outer membrane vesiculation in Acinetobacter baumannii · 2026 · DOI

  • The lack of effective treatments for toxin-mediated diseases. The need for novel therapeutic options against bacterial AB-type toxins. The potential of endogenous proteins/peptides as inhibitors for bacterial toxins is not fully explored.

    Novel endogenous protein-based strategies to inhibit clinically relevant bacterial AB-type toxins including pertussis toxin · 2026 · DOI

  • This study has several limitations. First, the analysis was based on ecological surveillance data; therefore, causal relationships between IMD incidence and societal factors such as population mobility or international travel cannot be determined.

    Nationwide epidemiology of invasive meningococcal disease in Japan, 2017–2025: implications of post-COVID-19 mobility · 2026 · DOI

  • There is a lack of reported cases of E. coli meningitis in adults with no known immunocompromising conditions. The paper identifies a need for increased awareness of E. coli as a potential causative agent in cases of community-acquired bacterial meningitis.

    Meningoencephalitis Caused by Escherichia coli in an Adult With No Known Immunocompromising Conditions: A Case Report · 2026 · DOI

  • There is a lack of data on the epidemiological trends and neurological outcomes of pediatric CNS infections in rural western India.

    Epidemiological trends and neurological outcomes of pediatric central nervous system infections in rural part of western India · 2026 · DOI

  • The observed increase in FC-EVs particles could be due to an enrichment of EVs or other substances. NTA cannot specifically identify EVs. Currently, the quantification of EVs remains challenging.

    Characterization of high-purity Aeromonas salmonicida extracellular vesicles and their inhibitory activity against Pseudomonas fluorescens biofilm formation · 2026 · DOI

  • High heterogeneity among Kp serotypes makes achieving effective vaccine coverage challenging, - Limited geographic representation of KL types, - Small sample size of certain KL…

    Evaluation of vaccine-induced anti-lipopolysaccharide antibodies against clinically relevant Klebsiella pneumoniae strains to inform vaccine design · 2026 · DOI

  • Investigating the relationship between titre and function against clinical strains, - Exploring the effectiveness of a Kp vaccine in different regions, - Developing a vaccine formulation targeting the highest burden…

    Evaluation of vaccine-induced anti-lipopolysaccharide antibodies against clinically relevant Klebsiella pneumoniae strains to inform vaccine design · 2026 · DOI

  • The potential for under-diagnosis of invasive meningococcal disease due to current standard-of-care practices, - The gap in laboratory confirmation and diagnosis…

    A Ten-Year Retrospective Review of Medical Records of Patients Admitted with Meningitis or Encephalitis at Five Hospitals in the United States Highlights the Potential for Under-Ascertainment of Invasive Meningococcal Disease · 2025 · DOI

  • Validate findings using multiple clinical isolates to assess strain-specific variability, - Perform in-depth analyses including mechanistic studies with modified or digested EVs and in vivo infection models, - Explore the molecular mechanisms through which EVs mediate host-pathogen communication to elucidate novel therapeutic…

    Differential Proteomic Analysis of Extracellular Vesicles Produced by Granulicatella adiacens in Biofilm vs. Planktonic Lifestyle · 2025 · DOI

  • Low in vitro detectability of fluorescent outer membrane vesicles, - Limited sensitivity of fluorescence detection in live animals, - Difficulty in understanding the complex relationship between the intestinal microbiota and pathological…

    Rapid Biodistribution of Fluorescent Outer-Membrane Vesicles from the Intestine to Distant Organs via the Blood in Mice · 2024 · DOI

  • Further research on the role of eDNA in nonpathogenic Neisseria - Investigation of the potential use of nucleases to disperse Neisseria…

    The role of extracellular DNA in Neisseria biofilms · 2026 · DOI

  • Further investigation of the identified inhibitors for their potential as therapeutic options. Application of the screening approach to identify inhibitors for other types of toxins. Exploration of the potential of endogenous proteins/peptides as inhibitors for bacterial toxins.

    Novel endogenous protein-based strategies to inhibit clinically relevant bacterial AB-type toxins including pertussis toxin · 2026 · DOI

Most-cited papers in Bacterial Infections and Vaccines

Most recent work

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Open questions raised by papers listed on this page include: (1) There is a lack of awareness about the possibility of hemorrhagic brain abscess mimicking an intracranial neoplasm (“Hemorrhagic brain abscess mimicking an intracranial neoplasm in invasive…”, 2026); (2) The lack of understanding of the mechanisms of matrix component release and incorporation into the biofilm matrix (“Extracellular membrane vesicles—previously unrecognized components of…”, 2026); (3) The study of extracellular vesicles has garnered significant attention, but there is a need for a comprehensive understanding of their role in intercellular communication (“Characterization of high-purity Aeromonas salmonicida extracellular vesicles…”, 2026); (4) The pathogenesis of cerebrovascular complications secondary to meningitis remains unclear (“Multiple cortical watershed infarctions following bacterial meningitis”, 2026); (5) The precise mechanism by which filamentous cell shape is regulated in the ΔdegP and ΔdegPΔamiAb mutants remains unclear (“Periplasmic crowding and peptidoglycan hydrolase activity as drivers of outer…”, 2026). 522 gap statements have been mined from Bacterial Infections and Vaccines papers in our 7.9M-paper local library, which holds 1,736 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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