Name three features of secondary immune responses that distinguish it from a primary response?

1. Faster and more robust: Secondary immune responses are faster and more robust than primary immune responses. This is because memory B cells and T cells, which are generated during the primary response, are already present in the body and ready to respond to the pathogen.

2. Increased affinity: The antibodies produced during a secondary immune response have a higher affinity for the pathogen than the antibodies produced during a primary response. This is because the memory B cells and T cells that are responsible for the secondary response have been exposed to the pathogen before and have had time to mature and produce higher-affinity antibodies.

3. Enhanced memory: The secondary immune response also leads to the generation of a larger and more diverse pool of memory B cells and T cells than the primary response. This means that the body is better prepared to respond to future infections by the same pathogen.