Protection against infectious disease conferred either by the immune response generated by immunization or previous infection or by other non-immunologic factors. (Bondad-Reantaso, M.G., McGladdery, S.E., East, I. & Subasinghe, R.P. (2001) Asia diagnostic guide to aquatic animal diseases. FAO Fisheries Technical Paper, (402/2): 237p.;)
Immunization is the process by which an individual's immune system becomes fortified against an infectious agent (known as the immunogen). (Wikipedia, 2024. Immunization. https://en.wikipedia.org/wiki/Immunization)
