[Experimental data on the virological study of pasteurized milk].

Virological analyses of sterile milk per se enabled the poliovirus to be disclosed with a concentration of 30 infection units in 1 ml. To determine such doses of the viruses in pasteurized milk the viruses have to be concentrated, for prior to cytopathogenic manifestations subsequent to these viral doses there occurs bacterial germination. In achieving poliovirus concentration in pasteurized milk are suitable polyethyleneglycol, molecular weight 15 000, and polyvinylpyrolidon, molecular weight 10 000, in a 10% concentration. Dilution of milk with Hanks' solution in the ratio of 1:4 and 1:9 improves the process of the poliovirus sorption-eluation with the polymer, enabling it to detect 3 BOU of the virus in 1 ml of milk. The AB-17-8 anionite and Ky-21-8 cationite are capable of adequately sorbing the poliovirus in pasteurized milk, but it is only from the cationite, and then only in a small amount, that eluation of the virus can be accomplished.