Pathogenesis is the study of the origin and development of a disease or illness within the body. It aims to understand the biological mechanisms that lead to the onset and progression of a disease, including the interaction between pathogens (such as viruses, bacteria, and parasites) and the host immune response. Research in pathogenesis involves identifying the specific factors and pathways involved in disease development, as well as potential targets for therapeutic interventions. By studying pathogenesis, researchers can gain insights into how diseases arise, spread, and cause damage, ultimately leading to the development of more effective treatments and preventive strategies.