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.
The primary immune response : the immune response occurring on the first exposure to an antigen. After a lag or latent period of from 3 to 14 days depending on the antigen, specific antibodies appear in the blood. There is a peak of IgM production lasting several days followed immediately by a peak of IgG production.