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.
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.