For more Details About Vacancies …. We strongly advise test takers to practice IELTS. A thorough understanding of the immune system entails understanding the significance of these: pathogens, innate arm, adaptive arm, flora, lysozyme, antimicrobial peptides, interferon, memory for pathogens, granulocytes, basophils, eosinophils, neutrophils, phagocytosing, inflammatory responses, dendritic cells, pathogen-associated molecular patterns PAMPs , antigen, macrophages, natural killer NK cells, vaccination, T cells, thymus, helper T cells, acquired immunodeficiency syndrome AIDS , cytotoxic T cells, B cells, plasma cells, antibodies, complement system, active and passive immunity, self-tolerant, autoimmune disease.