So this is our primary response. Now, what about a secondary response? So let's suppose as soon as the primary response is over, our pathogen reinfects our body. So the same type of pathogen with the same exact antigens reinfects our body. Now, the type of response that our immune system will essentially elicit is called not a primary, but a secondary response. It's secondary because it's the second time our pathogen makes its way into our body.