Active immunity results when an immune response to a pathogen produces memory cells, and memory cells are the basis of immunological memory. Given these facts, active immunity results when an immune response to a pathogen produces the basis of what among the following options:
- immunological memory
 - failed memories
 - resistance
 - broken memory
 - major threat to health
 - resistance activities
 - Leptospirosis
 - sad memories


 

 immunological memory        