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

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.