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.
People do not develop a secondary immune response to influenza because. A. the immune system mutates from season to season. B. flu vaccines are not always effective. C. secondary immune responses are only possible against bacteria. D. the primary immune response is sufficient to protect against flu.