The immune system has an immune arsenal that help in the combat of infections including the challenging viral infections (Iannello 2006). Upon infection by a virus, the host invariably reacts by activating its line of defenses. These immune defenses can fall into two main groups: the innate immune system (first line of defense) and adaptive immune response. The innate immune system is non-specific in nature, but the adaptive immune system is acquired following previous infections or vaccinations (Iannello 2006). However, viruses continue to undergo an evolution and have engineered strategies that evade the hosts’ immune antiviral responses. This paper examines ...
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Introduction
Antigen Presentation Antigen presentation plays a pivotal role in the immune system through which pathogenic antigens are processed and coupled along with major histocompatibility complex (MHC), and presented to T cells for their effector response. Macrophages, B cells and dendritic cells are the primary antigen presenting cells (APC’s). Intracellular antigens generated by viruses, or some cytoplasmic bacterial antigens are digested by the host cells and coupled with MHC Class I by Transporter associated with antigen Processing complex (TAP), which transports them to the cell surface and presents to CD8+ cytotoxic T cells (Germain, R 1994). These cells elicit a ...