Bacterial endotoxins as contamination of biopreparations have been estimated by chromogenie LAL test. Study on some compounds (aluminium hydroxide, formaldehyde and mertiolate) being components of vaccines showed no effect on the result of LAL test. The level of endotoxins in virus vaccines with the limits defined in producers certificate was adequate, the level of endotoxin was also low in virus vaccines of undefined requirements. The concentration of endotoxin in bacterial vaccines was differentiated. Considering the results of our experiments, as well as the fact, that the requirements for endotoxin contamination of bacterial vaccines are not available it seems necessary to establish the limits for these group of biopreparations.
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