Despite a long study of the human body, it still keeps secrets from us. For example, Australian scientists even found a whole organ in the immune system, previously unknown. It is well known that people who are exposed to certain infections often remain immune to these formations. However, there are still questions regarding how this process works. Researchers have identified a structure that “remembers” past infections and vaccinations, and is filled with many types of immune cells that respond to pathogens that the body has previously encountered. According to scientists, the structure exists for the early detection of infections. It was discovered when the team used an advanced imaging technique known as three-dimensional microscopy, essentially creating “films” of the immune system in action inside living organisms. The structure that spreads through the lymph nodes is thin, flat and appears only when organisms undergo infection, which I have already seen. Structures called SPFs, “subcapsular proliferative foci,” the researchers found in both mice and humans. When the team used microscopy techniques to view SPF in the body, they saw several different types of immune cells, including “memory cells B,” which contain information on how best to attack infections. \Harvan Medical Research Institute. “We could see how they move, interacting with all these other immune cells and turning into plasma cells in front of our eyes.” According to the researchers, the latest results can help professionals better understand how to develop more effective vaccines.