[The mutagenicity of a new multicomponent vaccine made from the antigens of Klebsiella pneumoniae, Staphylococcus aureus, Proteus vulgaris and Escherichia coli].

Inactivated bacterial vaccine, containing K. pneumoniae, S. aureus, P. vulgaris and E. coli antigenic complexes were tested for mutagenicity in the test described by Ames et al. and in vivo, in experiments on mice. In Salmonella typhimurium cells, strain TA-98 and TA-100, the preparation (5-75 mg/ml) did not increase the frequency of reversions and histidine-independence either in direct experiments or after metabolic activation with rat liver homogenate. In experiments on mice the vaccine (3.3 mg/kg and 33 mg/kg) did not induce chromosomal anomalies in spermatogonia. In all experiments the mutagens used for positive control produced a mutagenic effect.