The use of a solid reagent in the triphenyl tetrazolium chloride (T.T.C.) test for significant bacteriuria is described. The reagent gave a positive result with 108 (86%) of 126 specimens of urine containing over 100,000 organisms per ml. In comparison with the standard T.T.C. test the modified test gave comparable results. Some possible reasons for the varying results obtained by different users of the T.T.C. test are discussed.
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