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Hemophilic bacteria are microorganisms that require specific growth factors, mainly hemin (factor X) and nicotinamide adenine dinucleotide (factor V), for their development and reproduction. These bacteria belong to the genus Haemophilus and are widely distributed in the human respiratory tract as part of the normal microbiota, but some species can cause serious infectious diseases. The most clinically significant representatives include Haemophilus influenzae, Haemophilus ducreyi, and Haemophilus aegyptius. These microorganisms play an important role in the development of respiratory tract infections, meningitis, septicemia, conjunctivitis, and other pathological conditions. In particular, Haemophilus influenzae has been recognized as a major cause of invasive infections in children and immunocompromised individuals.The relevance of studying hemophilic bacteria is associated with their epidemiological importance, pathogenic potential, and increasing resistance to antimicrobial agents. Understanding their biological characteristics, mechanisms of pathogenicity, and interaction with the human immune system is essential for improving diagnostic methods, prevention strategies, and effective treatment approaches. Modern microbiological and immunological research has significantly expanded knowledge about the structure, virulence factors, and transmission pathways of these bacteria. Special attention is given to the role of vaccination in reducing the incidence of infections caused by these microorganisms, particularly in pediatric populations. Therefore, comprehensive investigation of hemophilic bacteria remains an important task in microbiology, virology, and immunology. Studying their medical significance contributes to the development of new preventive and therapeutic strategies aimed at reducing the global burden of infectious diseases associated with these pathogens.