Experiments were conducted on white old non-linear rats. Acute somatic pain (4–5 degree of intensity) was simulated by electrocutaneous stimulation of the receptor zone of the root of the tail. The animals were decapitated and blood sampling was carried out to study the activity of lysozyme by nephelometric method after the acute somatic pain. Acute somatic pain activates system of lysozyme in 1 hour after painful irritation in old rats. Acute somatic pain has high values in 60 min. after acute somatic pain in old age rats.
lysozyme, pain, old age, congenital immunity.
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