Defensa inmune (segunda parte)

The video explains how the immune system defends against diseases. Pathogens have unique molecules called antigens. Lymphocytes with matching receptors bind to these antigens, triggering antibody production. Antibodies mark pathogens for destruction. Some lymphocytes remain active after an infection, providing immunity by responding quickly to future attacks. This process underlies how vaccines work, preparing the immune system for faster, more precise responses to known pathogens.

Describe the body's response to a virus attack after the first exposure.

Explain the concept of immunity and how it relates to vaccines.