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.
Primary versus Secondary Immune Response The primary immune response occurs the first time that the immune system comes in contact with the antigen.
This generally indicates that the immunogen has been eliminated from the body and consequently there is no stimulus for continued antibody production. When a similar antigen enters the host for the second and subsequent times, the immune responses induced are called secondary immune responses. During secondary immune responses the lag period is shortened and antibody level reaches a very high steady state level within few days.