Banks with branches in Harker Heights (2011 data): First National Bank Texas: Harker Heights Wal Mart - Rc 880, Harker Heights Branch - Rc 121, First Community Mortgage Company, Market Heights Banking Center - Rc 1.
Allergic inflammations, also called hypersensitivities, are caused by three underlying mechanisms. The one which is responsible for the reaction to poison ivy is called delayed hypersensitivity. Delayed hypersensitivity does not start to be noticeable until several hours to a full day after exposure to the antigen.
Delayed-type hypersensitivity A good example of this is poison ivy exposure (patient gets exposed to poison ivy, helper T cells respond and some become memory cells; upon repeat exposure the memory T cells rush to the site, activating macrophages and causing inflammation). Another example is the Mantoux test; same principle.