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.
The primary immune responses can be divisible into four phases (lag phase, exponential phase, steady state phase, and declining phase) (Fig. 7.1). a. The lag (latent) phase is the period from the initial exposure of immunogen to the time of detection of antibodies (In humans the average time of lag phase is about one week).