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Sensitization: mechanism by which the body, after a first contact with an antigen, acquires  a capacity for reaction to it.

Serotherapy: injection of animal or human sera with high amounts of specific antibodies  which can neutralize a microbial antigen, a toxin, a bacterium, venom or virus. Serum: the liquid fraction of the blood plasma. Artificial serum is a physiological solution used in sub-cutaneous or intravenous injections. 

Skin Test: cutaneous inflammatory reaction test for diagnostic purposes. It is performed by  introduction into the body, by scarification, of a toxin or a product to which the subject may  be sensitized.

Spasm: a sudden, violent, involuntary, non-rhymthic contraction of one or more muscles. Specific Vaccination: synonymous for "desensitization".

Squamata: a thin layer of scales which detaches from the surface of the skin.

Steroid: general name given to hormones secreted by the adrenal glands. Synonymous with  corticosteroid.

Steroid Therapy: therapeutic use of adrenal hormones; in particular cortisone. Symptoms: any manifestation of a disorder or a disease which makes it possible to predict,  to contribute to diagnosis, to reveal a condition, or an outcome.

Syndrome: collection of clinical symptoms and/or signs which can be observed in several  different pathological conditions and with no specific cause.