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.
Five types of hypersensitivity reactions have been described: types I, II, III and V depend on antigen antibody interactions and have been termed âimmediateâ and type IV reactions depend on interaction of antigen with T lymphocytes and has been called âdelayedâtype hypersensitivityâ, or DTH.ive types of hypersensitivity reactions have been described: types I, II, III and V depend on antigen antibody interactions and have been termed âimmediateâ and type IV reactions depend on interaction of antigen with T lymphocytes and has been called âdelayedâtype hypersensitivityâ, or DTH.