Bs. Reisner et Ef. Austin, EVALUATION OF CPS ID-2 CHROMOGENIC AGAR AS A SINGLE MEDIUM FOR URINE CULTURE, Diagnostic microbiology and infectious disease, 28(3), 1997, pp. 113-117
The CPS ID 2 (CPS) chromogenic agar was compared to routine media for
use in the isolation, enumeration, identification, and susceptibility
testing of bacteria recovered from urine specimens. Of 487 urine speci
mens, 318 were culture negative, 12 were positive on CPS only, 16 posi
tive on routine only, and 141 positive on both. The enumeration of mic
roorganisms agreed for 96 of the 141 cultures. Fewer organisms were re
covered on CPS for 25 cultures, more for 20 cultures. The identificati
on of bacteria from CPS and routine media agreed for all isolates. Sus
ceptibility testing was performed for 200 isolates. The categorical su
sceptibility test results from isolates grown on CPS agreed with resul
ts from routine media for 77 isolates. For the remaining 23 isolates,
one or more discrepancies were seen involving 16 different antimicrobi
al agents; 27 minor, I major, and 6 very major errors. After additiona
l testing, there were 10 confirmed errors, 7 minor and 3 very major er
rors. This study demonstrates that CPS agar is a reliable medium for c
ulturing urine. Susceptibility testing directly from this medium resul
ted in low error rates for all antimicrobial agents tested. (C) 1997 E
lsevier Science Inc.