Alterations in Immunity and Inflammation
نویسنده
چکیده
T he immune system is a fi nely tuned network that protects the host against foreign antigens, particularly infectious agents. Sometimes this network breaks down, causing the immune system to react inappropriately. Inappropriate immune responses may be (1) exaggerated against environmental antigens (allergy); (2) misdirected against the host’s own cells (autoimmunity); (3) directed against benefi cial foreign tissues, such as transfusions or transplants (alloimmunity); or (4) insuffi cient to protect the host (immune defi ciency). All of these can be serious or life threatening. Exaggerated immune responses (allergy) are the most common, but usually the least life threatening.
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تاریخ انتشار 2009