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.
Difference Between Primary and Secondary Immune Response | Immune Response. Difference Between Primary and Secondary Immune Response ! Imagine a person is never exposed to a particular immunogen. For the first time in his life one antigen enters into his body (this event is called Priming). This leads to a relatively week, short-lived immune responses called Primary immune responses.