Delayed Type Hypersensitivity (DTH) is a form of immune response that occurs later, typically 24-72 hours after exposure to an antigen. Unlike immediate hypersensitivity reactions, DTH involves T cells rather than antibodies. This kind of hypersensitivity is an important aspect of the immune system's defense mechanism, particularly against intracellular pathogens like mycobacteria, fungi, and certain parasites.
