What is the significance of memory cells in vaccination?

Memory cells play a crucial role in the effectiveness of vaccinations by enabling the immune system to respond more quickly and efficiently upon subsequent exposure to the same pathogen. When a vaccine is administered, it stimulates the immune system to produce specific antibodies and memory cells that recognize and remember the particular antigens present in the vaccine.

These memory cells remain in the body long after the initial exposure and are poised to spring into action if the individual is later exposed to the actual pathogen. This leads to a faster and stronger immune response, significantly reducing the time it takes for the body to fight off the infection. Consequently, vaccination can effectively prevent illness by ensuring that the immune system is prepared to tackle infections it has encountered previously.

In contrast, the other choices don't accurately reflect the role of memory cells. They do not promote rapid healing, nor do they have a function related to DNA repair, and they certainly do not increase susceptibility to diseases. Instead, they serve the vital purpose of enhancing immunity, particularly through the mechanism of immunological memory.