invention is based on the idea of providing a model for the antibacterial activity of a fiber or cloth containing a modified zeolite component this model provides a method of predetermining the antibacterial properties of a textile article based upon the concentration of modified zeolite and the physical parameters of the yarn incorporated in it accordingly the invention enables the prediction of the spatial distribution of antibacterial activity of a textile having predetermined physical characteristics moreover the invention provides a procedure for calculating the minimum amount of modified zeolite needed for a textile product to possess a particular level of antimicrobial activity thus allowing the production of application sensitive non allergenic textile articles as used herein the term yarn is intended to be inclusive of any thread filament fiber polymer or combinations thereof used in woven textiles the term denier is a unit of fineness equal to the fineness of a yarn weighing one gram for each 9000 meters as commonly defined in the art the term warp refers to a series of yarns extending lengthwise in a loom crossed by the woof or weft the filling yarn of a woven textile article in the description that follows the textiles are described as made with cotton as a complementary fiber to antibacterial polyester yarn of the type described in u s pat no 4 775 585 as would be understood by one skilled in the art antibacterial polyester yarn can by mixed with other natural or synthetic fibers either exclusively or in combination provided that they are of nearly the same denier and length in order to create a mechanically acceptable thread or yarn it is obvious that the antibacterial thread used in the following description can be replaced by an.