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.
A second feature of the specific immune response is that it demonstrates memory. The immune system remembers if it has seen an antigen before and it reacts to secondary exposures to an antigen in a manner different than after a primary exposure.g class variation-In the primary response the major class of antibody produced is IgM whereas in the secondary response it is IgG (or IgA or IgE) (Figure 4). The antibodies that persist in the secondary response are the IgG antibodies.