Understanding Vaccination: How Memory Cells Respond to Invasion by Pathogens

The video explains how vaccination works by triggering an immune response to create memory cells, which help the body respond faster to future infections by the same pathogen. Vaccines contain dead or weakened pathogens or fragments with antigens that stimulate the immune system without causing illness. Memory cells ensure a quicker and stronger response upon re-exposure to the pathogen, preventing illness. The video also highlights the benefits of vaccination, such as immunity without disease, and notes that vaccines are specific to the pathogens they target.

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