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Originally Posted by jinx
Does the decadron confer immunity or what Merc?
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No, what it does is reduce the inflamatory process by stablizing Mast cells which reduces the influx of neutrophils. During the allergic response mast cells are stimulated and they in turn begin a cascade of inflamatory responses which are an effort to fight the allergic response (in this case the substance which causes the PI). It is a double edge sword because the allergic cascade is actually your bodies attempt and response to the event, but it is also what causes much of the discomfort swelling, redness, weeping, itching, etc. So basically it treats the symptom.