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.
Differentiate between the primary and secondary immune response. Ans: After initial exposure to most antigens, there is a latent period during which plasma cells produce no detectable antibodies. Immunoglobulin M (IgM) appears after 5 to 7 days, signaling the beginning of the primary immune response.