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Cellular Immunity
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The page below is a sample from the LabCE course
Normal Peripheral Blood Cells (retired 6/20/2012)
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Cellular Immunity
Cellular immunity includes delayed hypersentivity reactions, graft rejection, graft-versus-host reactions, defense against intracellular organisms, and probably defense against neoplasms.
Cellular immunity is mediated by lymphocytes which we call T-cells.
T-cells are so named because they are dependent on the thymus for their production and development.
The majority of T-cells are long-lived with an average lifespan of 4.4 years, but it is known that some survive for as long as 20 years or more.
T-cells are capable of leaving and re-entering the circulation many times during their long life.
T and B cells cannot be differentiated when viewing blood films.
They are identified through the use of immunologic cell markers.
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