n. 过敏性

[医] 过敏性, 过敏症, 过敏反应

[ noun ]
hypersensitivity reaction to the ingestion or injection of a substance (a protein or drug) resulting from prior contact with a substance
<noun.state>

anaphylactic shock \anaphylactic shock\ n. (Med.)
a severe form of physiological shock, often having a fatal
outcome, caused by an extreme immunological reaction to
antigens. It is a severe form of {anaphylaxis[2]}, and is
characterized by smooth muscle contraction and capillary
dilation throughout the body, initiated by antibodies of the
IgE class. It is usually seen when an antigen to which a
person has become hypersensitized is injected intravenously
or subcutaneously. It is also called {generalyzed
anaphylaxis} or {systemic anaphylaxis}, and sometimes
{anaphylaxis}. --[Stedman]
[PJC]


anaphylaxis \anaphylaxis\ n.
1. [Gr. 'ana` back, way from + fy`laxis security,
protection.]

1. (Med.) hypersensitivity (to a protein or drug) resulting
from prior contact with a substance.
[WordNet 1.5]

2. (Med.) an immediate but transient allergic reaction to an
antigenic substance to which a person has become
hypersensitized; it is characterized by the contraction of
smooth muscle and capillary dilation. These reactions are
caused by the release of certain substances such as
histamine, bradykinin, serotonin, and slow-reacting
substance in response to the reaction of the antigen with
a mast cell-fixed antibody, chiefly IgE. This term is
sometimes used to refer to the severe form of the reaction
called {anaphylactic shock}. --[Stedman]
[PJC]