Avian Immune System Unveiled: A Comprehensive Prospective

Aim of the Study: This study focuses on the immunological mechanisms of avian species specifically of poultry species, which are vital for global food security. Avian immune responses mechanism is like other animals’ immune response mechanism, but they have also developed distinct characteristics that are due to their unique physiology. Methodology: As this is a review article, it focuses on comprehensive review of all available and possible literature regarding avian immune system including innate immunity, adaptive immunity and over all functioning of immune response. Findings: The innate immune system serves as the primary defense mechanism, characterized by immediate reactions through physical barriers and cellular components such as macrophages. These innate defenses are promptly activated by pattern recognition receptors that identify pathogen-associated molecular patterns and damage-associated molecular patterns. The bursa of Fabricius plays a pivotal role in humoral immunity by enabling the differentiation of B lymphocytes into plasma cells responsible for antibody production. Conversely, T lymphocytes undergo maturation in the thymus and are vital for cell-mediated immunity. Helper T cells stimulate B cells, while cytotoxic T cells target and eliminate infected or cancerous cells. These processes result in efficient immune defenses, but with limitations on immune gene rearrangements distinct from those in mammals, resulting in variations in B-cell receptor diversity. This limitation may influence vaccine efficacy and increase susceptibility in case of stress or chronic infections. Conclusion: Avian immunology plays a vital role in vaccination strategies that enhance health management practices in poultry production systems which results in enhanced global food security.