use-dilution test

use-dilution test

[′yüs də¦lü·shən ‚test]
(microbiology)
A bioassay method for testing disinfectants for use on surfaces where a substantial reduction of bacterial contamination is not achieved by prior cleaning; the test organisms Salmonella choleraesuis and Staphylococcus aureus are deposited in stainless steel cylinders which are then exposed to the action of the test disinfectant.