Comparison of Chromogenic (HiCrome Urinary Tract Infection Agar) Medium with Cysteine Lactose Electrolyte Deficient...

Urinary tract infections (UTI) are one of the most frequent infections encountered in hospital settings as well as in community, making urine the most cultured specimens in laboratories across the world. Urine samples occupy most of the time and manpower in the form of resources in the microbiology laboratories. The microbiological performance of HiCrome UTI agar was compared with cysteine lactose electrolyte deficient (CLED) agar for isolation and presumptive identification of bacteria from urine culture with ease of reporting with less human resource and reduction in the cost.

The study was conducted in a total of 208 collected midstream catch urine samples from patients attending the Department of Microbiology, Khartoum Teaching Hospital Central Laboratories. Urine samples received in the bacteriology laboratory were inoculated on CLED agar and for HiCrome UTI agar simultaneously and incubated overnight. Isolates were identified by the colony's color for HiCrome UTI agar and by standard microbiological techniques for CLED agar.

Out of 208 urine samples tested, significant growth was obtained in 94 (45.2%) plates of CLED agar and 84 (40.4%) of HiCrome UTI; moreover, 15 (7.2%) and 28 (13.5%) plates showed mixed with no growth observed in 99 (47.6%) and 96 (46.1%) on CLED agar and HiCrome UTI agar, respectively. The rate of presumptive identification was found significantly higher on HiCrome UTI agar (94%) than CLED agar (84%) (P < 0.05) as the primary urine culture medium. out of 43 (100%) polymicrobial growths 28 (65.1%) were demonstrated distinctly on HiCrome UTI agar and only 15 (34.9%)were obtained fromCLED agar.

HiCrome UTI agar was found to be more useful as a primary urine culture medium in both higher rate of isolation and presumptive identification of uropathogens in comparison to conventional media. Its inherent characteristics in demonstrating polymicrobial growth and ease of rapid identification by distinct colony color are unique.