AN INHIBITOR OF VIRAL ACTIVITY APPEARING IN INFECTED CELL CULTURES

Abstract
Medium from human kidney tissue culture cells, exposed to a strain of avirulent chick embryo-adapted Type II poliovirus, inhibits the infection of human amnion and renal cells by homotypic and heterotypic poliovirus as well as other unrelated viruses. This property does not appear to be associated with infective virus or specific viral antigen.
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