The Japanese word for Japan is æ¥æ¬, which is pronounced Nippon or Nihon and literally means the origin of the sun. The earliest record of the name Nihon appears in the Chinese historical records of the Tang dynasty, the Old Book of Tang.
The secondary immune response occurs the second time (3rd, 4th, etc.) the person is exposed to the same antigen. At this point immunological memory has been established and the immune system can start making antibodies immediately.
If the first plan fails to do the job entirely or just doesn't manage to do a good enough job, well, there needs to be something else to back it up. In the case of your body, your primary defense system involves components of the innate immune system, such as your skin, cells like neutrophils and so forth. However, if the innate immune system fails or needs some extra help, then the second part of the immune system, the adaptive immune system, kicks in to high gear.