ICT (Information Communications Technology) is a term widely used in the context of education. Even though there is no universally accepted definition for ICT, it mainly refers to utilizing digital technologies such as computers, television, email, etc to help individuals or organizations to use information.
Type IV (called also delayed hypersensitivity) involves sensitized T lymphocytes that react with cell bound or associated antigen and release lymphokines, causing mononuclear cell accumulation, tissue damage and inflammation, typically manifesting at least 24 hours after exposure to 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.