“…In addition to bacteriological methods (2,3,5,7,8,(10)(11)(12), chemical screening tests have been devised based upon reduction of nitrate to nitrite (the Griess test) by bacteria (4,6,9,(18)(19)(20), removal of residual amounts of glucose in the urine by bacterial action (7,13,15), presence of enzymes in urine derived from bacteria or inflammatory cells such as catalase, and reduction of tetrazolium salts by bacteria after standardized incubation of voided urine (4,16). In general, most culture methods have the advantage of being both highly sensitive and specific, providing presumptive identification and permitting subculture to obtain antimicrobial susceptibility information.…”