Category: Science > Immunology
One of the most fascinating aspects of the immune system is its ability to "remember" pathogens it has encountered before, a phenomenon known as immunological memory. After an initial infection or vaccination, the immune system produces specialized cells called memory T and B cells that persist long after the pathogen has been eliminated. These cells enable the body to respond more swiftly and effectively if the same pathogen invades again. This mechanism not only forms the basis for the effectiveness of vaccines but also underpins the concept of herd immunity, where a significant portion of a population becomes immune, thereby providing indirect protection to those who are not immune. This intricate system is a testament to the body's sophistication in adapting to threats and highlights the importance of ongoing research in immunology, particularly in the development of vaccines for emerging diseases.