You are presented with the quiz "What results when intracellular pathogens evade activation of the cell?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "active immunity results when an immune response to a pathogen produces memory cells" and "mechanisms by which intracellular pathogens evade activation of the cell mediated immune response". 

So, what's the best answer to the question?


 

       active immunity    