Introduction
In recent years, in farm and private livestock farms in Uzbekistan there has been a decrease in the resistance of animals and, especially, young animals to various bacterial and viral infections. Often there is a decrease and a complete lack of protective action of known vaccines and serums, which causes serious economic damage to livestock. One of the leading factors of this pathology is the unfavorable ecological situation which has developed in many regions of the Republic owing to various anthropogenic influences, including: application of pesticides and other toxic xenobiotics and also emissions of industrial productions.
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