Type I Hypersensitivity Reactions
Under some circumstances, immune responses produce damaging and sometimes fatal results, known collectively as hypersensitivities. Hypersensitivity reactions differ from protective immune responses in that they are exaggerated or inappropriate and damaging to the host. Hypersensitivity reactions are classified by the immune mechanism. Type I hypersensitivity reaction (also known as immediate hypersensitivity) occurs upon the reaction…