Journal of Research in Microbiology and Immunology ISSN: 3108-0952 (Online)

Authors: Dr. Ananya Verma, Dr. Siddharth Rao

Abstract: The human gut microbiota represents a complex ecosystem critical for maintaining immune homeostasis. Emerging evidence underscores the bidirectional communication between intestinal microbes and the host immune system, influencing both innate and adaptive immune responses. Dysbiosis, or microbial imbalance, has been implicated in autoimmune disorders, allergies, and chronic inflammatory conditions. This review delineates the mechanisms through which gut microbiota modulate immune cell differentiation, cytokine production, and barrier integrity. Key microbial taxa, such as Bacteroides, Lactobacillus, and Faecalibacterium prausnitzii, contribute to immune tolerance and pathogen defense. Furthermore, strategies to restore microbiota balance, including prebiotics, probiotics, dietary interventions, and fecal microbiota transplantation, are discussed. Tables summarizing microbial influences on immune pathways and clinical outcomes are included. Understanding gut microbiota’s role provides a foundation for targeted therapeutics aimed at promoting immune health and mitigating immune mediated diseases.

Keywords: Gut microbiota, Immune homeostasis, Dysbiosis, Probiotics, Fecal microbiota transplantation, Inflammation, Immune modulation

Authors: Dr. Richa Sharma, Dr. Anil Mehra

Abstract: Epigenetic modifications play a pivotal role in immune cell differentiation, activation, and functional plasticity. DNA methylation, histone modifications, and non-coding RNAs orchestrate gene expression programs that determine lineage commitment and effector functions of immune cells. Dysregulation of these mechanisms contributes to impaired immunity, autoimmunity, and susceptibility to infections. This review explores key epigenetic regulators influencing T-cell, B-cell, and innate immune cell development, with emphasis on molecular pathways, functional consequences, and therapeutic potential. Tables summarize epigenetic marks, associated enzymes, and their roles in immune regulation. Challenges in translating epigenetic insights into clinical applications and recent advances in targeted epigenetic therapies are discussed. Understanding the interplay between epigenetic modifications and immune function offers promising avenues for immunomodulation and precision medicine. 

Keywords: Epigenetics, immune cell differentiation, DNA methylation, histone modification, non-coding RNA, T-cell plasticity, immunotherapy.

Authors: Dr. Kavita Joshi, Dr. Arvind Rao

Abstract: Seasonal influenza poses a persistent global health challenge, with annual epidemics causing significant morbidity and mortality. The rapid antigenic drift and shift in influenza viruses necessitate frequent vaccine reformulation, limiting the effectiveness of conventional vaccines. Development of a universal influenza vaccine (UIV) aims to elicit broad, long-lasting protection against diverse influenza strains. This review examines the immunological targets, including conserved hemagglutinin stalk, matrix proteins, and internal antigens, alongside current vaccine platforms such as mRNA, viral vectors, and nanoparticle-based approaches. Key challenges, including antigenic variability, immune imprinting, and vaccine delivery, are discussed. Recent preclinical and clinical advances demonstrate the feasibility of UIV candidates, highlighting their potential to transform influenza prevention strategies. Future perspectives emphasize integration of novel adjuvants, structural vaccinology, and immunogen design to achieve broad-spectrum, durable immunity. 

Keywords: Universal influenza vaccine, hemagglutinin stalk, conserved antigens, vaccine platforms, immunogenicity, viral variability, structural vaccinology.

Authors: Dr. Meera Kapoor, Dr. Arjun Nair

Abstract: Inflammatory diseases, including inflammatory bowel disease, rheumatoid arthritis, and metabolic disorders, are characterized by dysregulated immune responses. Probiotics with immunomodulatory properties offer promising therapeutic avenues by restoring microbial balance and modulating host immune pathways. This paper examines the development of immunomodulatory probiotics, focusing on molecular mechanisms by which probiotics influence innate and adaptive immunity, cytokine production, and gut barrier integrity. Tables summarizing probiotic strains, their immune- modulatory effects, and targeted inflammatory diseases are provided. Advances in genetic engineering, prebiotic co-administration, and strain selection strategies are discussed. Understanding probiotic-host immune interactions can inform the development of safe and effective probiotic therapeutics to manage inflammatory diseases.

Keywords:Immunomodulatory probiotics, Inflammatory diseases, Cytokine modulation, Gut microbiota, Adaptive immunity, Therapeutic probiotics, Immune homeostasis

Authors: Dr. Neha Agarwal, Dr. Karthik Rao

Abstract: Dendritic cells (DCs) are pivotal antigen-presenting cells that bridge innate and adaptive immunity, making them central to vaccine development. They capture, process, and present antigens to T lymphocytes, initiating targeted immune responses. This review explores DC subsets, their mechanisms of antigen uptake and presentation, and the molecular pathways that modulate T-cell activation. The role of DCs in shaping humoral and cellular immunity, their migration to lymphoid organs, and cross-presentation capabilities are discussed. Furthermore, strategies for leveraging DCs in next-generation vaccines, including DC-targeted antigens, adjuvants, and nanoparticle-based delivery systems, are analyzed. Understanding the immunobiology of DCs can inform rational vaccine design, improve immunogenicity, and enhance protective responses against infectious and malignant diseases.

Keywords: Dendritic cells, antigen presentation, vaccine design, adaptive immunity, cross-presentation, immunotherapy, immunogenicity.

Authors: Dr. Rohan Mehta, Dr. Kavita Joshi

Abstract: The rapid emergence of antibiotic-resistant pathogens poses a significant threat to global public health. The increasing prevalence of multidrug- resistant bacteria compromises the efficacy of conventional antibiotics and complicates the treatment of infectious diseases. This paper explores the mechanisms underlying antibiotic resistance, identifies the most prevalent emerging resistant pathogens, and reviews contemporary strategies for control and mitigation. Mechanisms such as genetic mutation, horizontal gene transfer, and biofilm formation contribute to pathogen resilience. Notably, pathogens including Methicillin-resistant Staphylococcus aureus (MRSA), Carbapenem-resistant Enterobacteriaceae (CRE), and Vancomycin-resistant Enterococci (VRE) have become major clinical concerns. Control strategies encompass antibiotic stewardship, development of novel antimicrobial agents, rapid diagnostic techniques, vaccination programs, and infection prevention and control measures. Tables highlighting key resistant pathogens and current control approaches are included. By integrating surveillance, innovative therapeutic strategies, and public health interventions, the global impact of antibiotic resistance can be mitigated effectively.

Keywords: Antibiotic resistance, Emerging pathogens, MRSA, CRE, VRE, Infection control, Antimicrobial stewardship

Authors: Dr. Kavita Joshi, Dr. Rohan Gupta

Abstract: CRISPR-Cas systems have emerged as powerful tools for precise genome editing and hold significant promise for antiviral therapies. This paper explores the application of CRISPR-based technologies for viral genome targeting, functional disruption, and control of viral infections. Various CRISPR platforms, including Cas9, Cas12, and Cas13, offer sequence-specific cleavage of DNA and RNA viruses, enabling suppression of viral replication and potential therapeutic intervention. We discuss delivery strategies, specificity, and challenges such as off-target effects, viral escape, and ethical considerations. Tables summarizing CRISPR systems, viral targets, and therapeutic outcomes are provided. Understanding the mechanistic and translational aspects of CRISPR-mediated viral control provides a foundation for next-generation antiviral strategies and pandemic preparedness.

Keywords: CRISPR, Cas9, Cas12, Cas13, Viral genome editing, Antiviral therapy, RNA viruses, DNA viruses

Authors: Dr. Ritu Menon, Dr. Anil Kumar

Abstract: Comparative genomics provides an invaluable approach to understand the genetic basis of microbial pathogenicity. By analyzing genomic differences between virulent and non-virulent strains, researchers can identify genes, regulatory elements, and mobile genetic elements responsible for disease manifestation. This paper reviews the methodologies for comparative genomic analysis, including whole-genome sequencing, pan-genome construction, and bioinformatics approaches. Key findings from bacterial and viral pathogens, such as Escherichia coli, Salmonella spp., and influenza viruses, are discussed, highlighting virulence factors, genomic islands, and horizontal gene transfer events. The review also explores the translational applications of comparative genomics in vaccine design, antimicrobial development, and epidemiological surveillance. Understanding the genomic determinants of virulence facilitates targeted interventions, rational therapeutics, and effective public health strategies.

Keywords: Comparative genomics, virulence factors, pathogenicity, microbial strains, genomic islands, horizontal gene transfer, bioinformatics.

Author: Dr. Ritesh Kapoor

Abstract: Biofilm formation by clinical microbial isolates represents a major challenge in healthcare, contributing to chronic infections, antimicrobial resistance, and immune evasion. This paper explores the mechanisms of biofilm development, the diversity of biofilm-producing pathogens in clinical settings, and the immunological consequences of biofilm-associated infections. Biofilms provide a protective niche for pathogens, impeding phagocytosis, reducing the efficacy of antimicrobials, and modulating host immune responses. Innate and adaptive immune responses are altered during biofilm-associated infections, resulting in chronic inflammation, impaired pathogen clearance, and tissue damage. Tables summarizing common biofilm-forming pathogens, biofilm characteristics, and host immune responses are included. Understanding biofilm biology and host–biofilm interactions is essential for the development of novel therapeutic strategies, including biofilm-disrupting agents and immunomodulatory interventions, to combat persistent clinical infections.

Keywords: Biofilm, Clinical isolates, Immune evasion, Chronic infections, Antimicrobial resistance, Host–pathogen interactions, Inflammation

Authors: Dr. Priyanka Sharma, Dr. Rohit Malhotra

Abstract: The rise of multidrug-resistant bacteria has necessitated the exploration of alternative antimicrobial strategies. Bacteriophage therapy, employing viruses that specifically target bacteria, offers a promising solution. This paper reviews the mechanisms, advantages, limitations, and current applications of bacteriophage therapy as an alternative to traditional antibiotics. Phages exhibit high specificity, minimal disruption of normal microbiota, and the ability to replicate at infection sites. Clinical applications in bacterial infections, biofilm eradication, and agricultural and environmental contexts are discussed. Limitations, including narrow host range, bacterial resistance, and regulatory challenges, are addressed. Emerging strategies, such as engineered phages, phage cocktails, and synergistic phage-antibiotic therapy, are evaluated. Understanding bacteriophage biology and therapeutic potential is crucial to combat the global threat of antibiotic resistance and develop effective, sustainable antimicrobial interventions.

Keywords: Bacteriophage therapy, antibiotics, multidrug resistance, phage cocktails, bacterial infections, antimicrobial alternatives, biofilm eradication.

Authors: Rajeev Khandelwal, Rudraksh Patil

Abstract: Natural antimicrobials have received significant attention in recent years due to their potentially harmful impact on health. Based on the findings of many investigations, chitosan, a biopolysaccharide generated from chitin that is naturally biodegradable and non-toxic, has the potential to be employed as a natural antibacterial. Chitosan has been shown to have potent antibacterial action against a wide range of pathogenic and spoilage microorganisms, including fungi and Gram-positive and Gram-negative bacteria. Intrinsic parameters such as the kind of chitosan and the degree of chitosan polymerization impact antibacterial activity, as do extrinsic ones such as the microbial organism, ambient circumstances, and the presence of additional components. The application of chitosan in food systems should be based on a thorough understanding of the complicated processes behind its antibacterial mode of action. We examine a number of papers on the examination of chitosan antibacterial characteristics and their application in culture and food media in this article.

Keywords: Antimicrobial, Preservative, Chitosan.

Authors: Santiago, Sebastián

Abstract: The Hymenoptera are an insect order that includes wasps (superfamily Vespideae), bees (superfamily Apoideae), and ants (super family Formicate). Hymenoptera stings can cause a severe allergic reaction, which can be fatal if not treated quickly. In Mexico, ants are a minor cause of hypersensitivity responses, with the most common species being Solenopsis Geminata (Tropical Fire Ant), Pogonomyrmex (Harvester Ant), and Camponatus (Carpenter Ant). Immunotherapy is the only effective treatment for future exposures. We describe a case of anaphylaxis caused by a tropical fire ant sting in a field worker from the state of Guerrero, as well as its diagnostic methodology and long-term effectiveness with a tailored Subcutaneous Immunotherapy with Whole Body Extract technique (WBE). Future study on ant biodiversity, allergic components in venom, and future reports and standardisation with the use of immunotherapy are required, as this is the first occurrence of immunotherapy in the Tropical Fire Ant (Solenopsis Geminata).

Keywords: Fire Ant, Solenopsis Geminata, Immunotherapy, Anaphylaxis, Bite Sting

Author: Sheetal Sharma

Abstract: The current research examines numerous studies that consider the role of homoeopathy as an immunological modulator. Both homoeopathy and immunology are theoretically related. Homoeopathy is clearly useful in increasing immune responses in illnesses ranging from allergies to neoplasms. Homoeopathic treatment has been shown to have stimulatory and co stimulatory effects in immunological processes such as haematological parameters such as total and differential leukocyte count proliferation, haemoglobin count with hematopoietic parameters such as bone marrow cellularity, inflammatory processes, CRP value, phagocytises, fibrosis, CD4+ & CD8+ count as well as a boost in immunoglobulin tit Several research studies indicate that homoeopathic immunotherapy has an immunological modulator impact on endogenous molecules such as thymulin, cytokines, histamines, and immunoglobulins (endoisotherapy). Homoeopathic preparations derived from common allergens, influenza agents, Leptospirosis, Tuberculosis, Vibrio parahemolyticus and Vibrio alginolyticus, and cancer cells have also been shown to be useful in eliciting an immune modifying response. Homoeopathic medications affect the immune system by altering gene expression, stimulating macrophages, chemo taxis of polymorph nuclear cells, and producing cytokines.

Keywords: Cytokines, Homoeopathy, Immuno-modulation, Immunotherapy

Authors :Dr. Anjali Menon, Dr. Vikram Singh

Abstract: Bacterial quorum sensing (QS) is a cell-density-dependent communication mechanism that regulates gene expression, biofilm formation, virulence factor production, and immune evasion. QS allows bacteria to sense environmental cues and coordinate collective behavior, enhancing survival in hostile host environments. Immune evasion strategies, including modulation of host cytokine responses, inhibition of phagocytosis, and secretion of immunosuppressive molecules, are often controlled by QS circuits. This paper explores molecular mechanisms of QS in Gram-positive and Gram-negative bacteria, links QS pathways to immune evasion, and discusses potential therapeutic strategies targeting QS systems. Tables summarizing key QS molecules, bacterial species, and immune evasion mechanisms are included. Understanding QS-mediated immune modulation provides novel insights into controlling bacterial infections and developing anti-virulence therapies.

Keywords: Quorum sensing, Bacterial communication, Virulence factors, Immune evasion, Biofilm formation, Anti-virulence therapy, Pathogen survival

Authors: Dr. Neha Kapoor, Dr. Rajat Verma

Abstract: Fungal infections pose significant clinical challenges due to the emergence of drug-resistant strains and the complexity of host immune responses. Resistance to antifungal drugs, including azoles, echinocandins, and polyenes, arises through molecular mechanisms such as efflux pump activation, target enzyme mutations, biofilm formation, and stress response pathways. Concurrently, the host immune system employs innate and adaptive responses, including pattern recognition receptor activation, phagocytosis, and cytokine mediated immunity, to counter fungal pathogens. This review highlights the molecular basis of antifungal resistance, mechanisms of immune recognition, and modulation of immune responses during fungal infections. Tables summarize resistance mechanisms, antifungal drug classes, and host immune responses. Understanding these interactions provides insights for novel therapeutic strategies, immunomodulation, and improved clinical management of fungal infections.

Keywords: Fungal resistance, antifungal drugs, immune response, biofilm, efflux pumps, azoles, echinocandins, host-pathogen interaction.

Authors : Dr. Priya Reddy, Aditya Sharma

Abstract: Dendritic cells (DCs) are pivotal antigen-presenting cells that bridge innate and adaptive immunity by capturing, processing, and presenting antigens to T cells. This paper reviews the biology of dendritic cells, focusing on their subsets, maturation processes, and mechanisms of antigen uptake and presentation through MHC class I and II pathways. We discuss cross presentation, cytokine secretion, and costimulatory molecule expression, which determine the quality and magnitude of T-cell responses. A table summarizing dendritic cell subsets and their primary functions is included. Understanding DC-mediated antigen presentation provides insights into vaccine development, immunotherapy, and modulation of immune responses in infections, cancer, and autoimmune diseases.

Keywords: Dendritic cells, antigen presentation, MHC class I, MHC class II, cross-presentation, immune response, T cells

Authors : Dr. Ananya Gupta, Rohan Mehta

Abstract: The complement system is a critical component of innate immunity, acting as a first line of defense against pathogens through opsonization, cell lysis, and inflammation. This paper explores the mechanisms of complement activation via classical, lectin, and alternative pathways and their roles in pathogen recognition and elimination. The regulatory mechanisms ensuring host protection and preventing overactivation are also discussed. A table summarizing key complement components, activation pathways, and associated functions is provided. Understanding the complement system is vital for developing therapies for infections, autoimmune diseases, and complement-mediated disorders.

Keywords: Complement system, innate immunity, classical pathway, lectin pathway, alternative pathway, opsonization, inflammation, complement regulation

Authors: Dr. Ananya Kapoor, Dr. Rahul Mehta

Abstract: Monoclonal antibodies (mAbs) have emerged as a cornerstone in cancer immunotherapy due to their ability to specifically target tumor-associated antigens and modulate immune responses. This paper reviews the mechanisms, clinical applications, and challenges associated with mAb-based therapies, including immune checkpoint inhibition, antibody-drug conjugates, and bispecific antibodies. A table summarizing key monoclonal antibodies and their target mechanisms is provided. Understanding the molecular mechanisms of mAbs enhances the development of personalized cancer therapy, improves patient outcomes, and reduces systemic toxicity. Emerging strategies focus on combination therapies, novel targets, and improved antibody engineering to overcome resistance.

Keywords: Monoclonal antibodies, cancer immunotherapy, checkpoint inhibitors, antibody-drug conjugates, bispecific antibodies, tumor-associated antigens, immune modulation

Authors : Dr. Neha Kapoor, Rahul Sen

Abstract: The alarming rise of antibiotic-resistant bacteria has compelled the scientific community to explore alternative therapeutics. Bacteriophages, viruses that specifically infect bacteria, have emerged as promising antibacterial agents capable of targeting multidrug-resistant (MDR) pathogens. Phage therapy exploits the natural lytic capabilities of phages to destroy pathogenic bacteria with high specificity, minimizing disruption to beneficial microbiota. This paper reviews phage biology, infection mechanisms, advantages over conventional antibiotics, clinical applications, and the challenges faced in therapeutic implementation. Advancements in genomics, synthetic biology, and phage engineering are enabling phage therapy to emerge as a critical strategy in the post-antibiotic era. With proper regulatory frameworks and clinical validation, bacteriophages have the potential to revolutionize the management of infectious diseases.

Keywords: Bacteriophage therapy, antibiotic resistance, phage biology, MDR pathogens, host specificity, phage engineering

Authors : Dr. Neha Kapoor, Rohan Mehta

Abstract: Viral vaccines stimulate protective immune responses through the coordinated activation of cellular and humoral immunity. This paper reviews the mechanisms by which vaccines induce T-cell and B-cell responses, including antigen presentation, cytokine production, and antibody generation. Key differences between live attenuated, inactivated, and subunit vaccines are discussed in the context of immune activation. A table summarizing viral vaccines and the type of immune responses elicited is included. Understanding these responses is critical for designing effective vaccines, optimizing booster regimens, and enhancing long-term immunity against emerging viral pathogens.

Keywords: Viral vaccines, cellular immunity, humoral immunity, T cells, B cells, antibody response, antigen presentation, cytokines

Authors : Dr. Neha Sharma, Rahul Verma

Abstract: The human gastrointestinal tract harbors a complex and dynamic community of microorganisms collectively referred to as the gut microbiota. These microbes, numbering in trillions, perform essential physiological functions that extend beyond digestion, profoundly influencing host metabolism, immunity, and homeostasis. The symbiotic relationship between gut microbes and the immune system plays a pivotal role in both immune development and regulation. Emerging evidence demonstrates that disturbances in this delicate microbial balance—known as dysbiosis—are linked to a wide array of immune-related disorders, including inflammatory bowel disease, allergies, autoimmune conditions, and metabolic syndromes. This paper explores the composition and functional diversity of gut microbiota, the mechanisms through which they modulate innate and adaptive immune responses, and the consequences of microbial imbalance. Additionally, it highlights current research trends on microbiota-targeted therapeutic interventions such as probiotics, prebiotics, and fecal microbiota transplantation. By elucidating the bidirectional communication between gut microbes and the immune system, this paper underscores the importance of maintaining microbial equilibrium for human health.

Keywords: Gut microbiota, immune modulation, dysbiosis, probiotics, intestinal homeostasis, microbial-host interaction

Authors : Dr. Priya Nair, Arjun Deshmukh

Abstract: Quorum sensing (QS) is a microbial communication mechanism that regulates collective behavior, including virulence factor expression, biofilm formation, and antibiotic resistance. This paper reviews the molecular mechanisms of QS in bacteria and fungi, highlighting its role in pathogenicity and host interaction. Key QS systems, signaling molecules, and their effect on virulence gene regulation are discussed. A table summarizing major pathogens, their QS signals, and associated virulence traits is provided. Understanding QS-mediated virulence modulation offers potential for novel therapeutic interventions targeting microbial communication to control infections and reduce antimicrobial resistance.

Keywords: Quorum sensing, virulence regulation, autoinducers, biofilm formation, bacterial communication, pathogenicity, antimicrobial resistance, signaling molecules

Authors : Dr. Kavya Sharma, Amit Joshi

Abstract: Microorganisms play a pivotal role in environmental sustainability and industrial applications. Microbial bio-remediation employs bacteria, fungi, and algae to degrade pollutants, restore ecosystems, and reduce toxic waste. Industrial microbiology leverages microbes for production of enzymes, biofuels, pharmaceuticals, and food products. This paper discusses microbial mechanisms in pollutant degradation, metabolic pathways utilized, and practical applications in industry. A table summarizing key microbial strains, target pollutants, and industrial uses is included. Understanding microbial bio-remediation and industrial applications can enhance environmental protection, optimize production processes, and drive biotechnological innovations.

Keywords: Microbial biodegradation, bio-remediation, bioprocessing, enzymes, sustainability, biotechnological applications industrial biofuels, microbiology, environmental

Authors: Dr. Arvind Mahajan

Abstract: In earlier research(1), we developed many compounds (oxadiazole,thiazole, thiadiazole)- five membered ring with a broad spectrum of bio-active characteristics and properties and considerable pharmacological actions due to its concentration of sulfur,oxygen, and nitrogen atoms. The irreversible solubilization of tooth mineral by acid generated by bacteria that attach to the tooth surface in bacterial colonies known as dental plaque causes dental decay. This effort entailed researching the effects of chemicals on oral microorganisms.

Keywords: Bacteria, Thiazole, Plaque, Oxadiazole, Thiadiazole, Sulfur, Oxygen, Teeth, Mouth

Authors : Gunjan Rathi, Dr. Kusum

Abstract: Women provide the majority of health care globally, in both official and informal settings, as well as at home. Unfortunately, their own health needs, particularly in rural and impoverished areas, are underserved. There is a need for a more comprehensive, evidence-based life cycle agenda for women's health that is not limited to pregnancy and the postpartum period. Anemia has a negative impact on women's health, resulting in higher maternal mortality, prenatal morbidity, preterm birth, and low birth weight, among other things. The article focuses on iron deficiency anaemia, which is the greatest in the world among Indian women.

Keywords: Anemia, Iron deficiency, Pregnant Women