[Effects of drugs on the results of passive hemagglutination test].

Study on the effects of some drugs on the results of passive hemagglutination test used for the detection of antitetanus antibodies in the blood serum showed that some drugs had a pronounced dose-dependent effect on antibody titers in experiments in vitro with standard antitoxic serum. The possibility of such errors should not be disregarded when assessing the results of the test.