Comparative Study Between Different Types of Media used for the Isolation of Uropathogens with Special Reference to E.coli.
Escherichia coli has been documented as the most important pathogen associated with urinary tract infections. The organisms isolated were Escherichia coli, Staphylococcus saprophyticus, Klebsiella aerogenes, Staphylococcus aureus, Pseudomonas aeruginosa, Streptococcus faecalis and Proteus mirabilis (Adedeji and Abdulkadir., 2009).UTI's more commonly progress to bladder infections in females due to the much shorter length of the female urethra. Among the elderly, UTI frequency is roughly equal proportions in women and men.
Risk factors--Women who experience acute UTI are characterized by both a genetic predisposition and behavioral factors. In healthy pre-menopausal women, sexual intercourse, and a history of recurrent UTI have been shown to be strong and independent risk factors for UTIs. Even recent antimicrobial use, by adversely effecting vaginal flora is considered as a potent risk factor (Giamarellou, 2001). Other behavioral factors include: frequency of urination, aspects of personal hygiene. Despite the frequency of acute uncomplicated UTI, there is little long-term morbidity and no evidence for mortality attributable to this problem. These women are not at increased risk of developing hypertension or renal failure. Short-term morbidity due to acute symptoms may however be substancial, especially for women with frequent UTI. Urinary tract infection is categorized as asymptomatic bacteriuria, acute cystitis ,acute pyelonephritis. Manifestations include burning pain on urination after with turbid foul smelling or dark urine, frequency and lower abdominal discomfort (Nahar et al., 2010).
In the community, bacterial infection of the urinary tract is one of the common causes for seeking medical attention. Although most UTIs are painful nuisance. The present study is undertaken with an aim to study the effect of media on isolation and identification of uropathogens from female patients attending hospital and clinics.
MATERIALS AND METHODS
100 urine samples, preferably mid stream urine were collected from local hospitals and pathology center in sterile vials from the district Allahabad, Uttar Pradesh. The samples were stored at 4[degrees]C for 24-48 hrs. The diagnosis of UTI is based on the microscopic findings of more than 10 pus cells/high power field (40X) in urine.
Isolation and Identification of E.coli
Freshly voided midstream urine was inoculated with calibrated loop on to different agar plates, and the plates were incubated at 37[degrees]C for 24 to 48hrs. Isolates were further identified by growth characteristics on selective and specific media, microscopic and biochemical tests.(Holt et al.,1994)
RESULTS AND DISCUSSION
Isolation and Identification
100 urine samples were taken. Mid stream urine were cultured on Nutrient Agar, MacConkey's Agar, Cystine-Lactose-Electrolyte-Deficient, HiCrome UTI Agar media. One loop full of the culture was streaked on different media and colonies on the media were obtained.(tab.No. 1)
From the study it was observed that the growth of organism over the media was according to the characteristics of the media. Mixed cultures were obtained on Nutrient agar, MacConkey's agar, and CLED agar. On MacConkey's agar lactose fermenting organism grows which gives pink to red color colonies. But the organism obtained from the Hicrome UTI agar media was of different colors. E.coli gives magenta color colony, Klebsella spp blue to purple, mucoid etc. Chromogenic media is better media than CLED, MacConkey,s agar and Nutrient agar.
The present findings were in concordance with the findings of (Aspevall et al., 2002) observed that the chromogenic media tested in this study was slightly better than CLED agar and MacConkey agar. Similar observation was also reported by (Fallon et al., 2003) that use of BBL CHROMagar, UTI medium, or CPS ID2 chromogenic agar as a replacement for cystine lactose electrolyte deficient agar would improve the detection rate of contaminated urine samples. "A cost comparison of the agars suggests that as the use of chromogenic agar in laboratories increases, the purchase cost is decreasing" (Fallon et al, 2003).
The overall impression of the color changes produced on chromogenic media by E. coli (purple--magenta), Klebsiella spp., (blue) and the Pseudomonas spp. (colourless) was that they were distinct and easy to perceive. In the study gram positive bacteria were also isolated as one chromogenic substrate is cleaved by [beta]-glucosidase possessed by Enterococci resulting in formation of bluish green colonies and S.aureus gives golden yellow color colonies. The result was in comparable with the result of (Aspevall et al., 2002). that chromogenic agars effectively supported the growth of gram-negative uropathogens but did not consistently support the growth of gram-positive and fungal uropathogens.
Cultural characteristics were observed by gram staining method. The cells observed were Gram negative, rod shaped bacteria. Similar result was reported by (Gaafar et al., 2006) E. coli are rapidly growing, Gram-negative, rod-shaped cells measuring approximately 0.5 x 2 im length. Further organisms other than glucose-fermentative and nonfermentative gram-negative rods were identified provisionally by their appearance on Gram stains and colonial morphology on 5% sheep blood agar; identification was confirmed by standard methods (Kodaka et al, 1995).
Biochemical characteristics were observed by various biochemical tests which were routinely done for identification of culture.
Similar work was done by (Jha et al., 2009) and (Islam et al., 2010). Biochemical tests were carried out on both reference E.coli and isolated strain to compare the result and to confirm the identity of the isolated organism. The tests were urease, oxidase, indole, catalase, TSI agar.
Incidence of uropathogens
Out of 100 samples 88 were found positive. The organism isolated were Escherichia coli (61%), Klebsella spp. (19%), S. aureus (9%), Proteus species (6%), Pseudomonas species (4%). (Fig1). Similar finding were reported by (Bashar et al., 2009) which showed that 67% were Escherichia coli, 11% Streptococcus faecalis, 8% Pseudomonas aeruginosa, 2% Enterococcus faecalis, 4% Staphylococcus aureus, 2% Hafnia alvei, 2% Citrobacter freundii, 2% Klebsiella pneumonia and 2% Yersinia enterocolitica. Gram negative isolates maximum were Escherichia coli 1937 (41.3%) followed by Klebsiella species 622 (15.8%) Pseudomonas species 534 (11.4%) Enterobacter species 376 (8%) and Proteus species 245 (6.2%). Amongst gram positive isolates maximum were Staphylococcus aureus 361 (7.8%) followed by Enterococcus species 278 (5.9%) (Sonavane et al., 2008).
In the present study, E. coli (61%) was the predominant bacterial pathogen followed by Klebsiella species, non-lactose fermenters. Pseudomonas species and others. Certain strains of E. coli have the ability to persist and predominate in the human intestine, making them more likely than other strains to cause UTI. In contrast to this finding, one study from Tamil Nadu showed Klebsiella and E. coli as the commonest isolate followed by P. aeruginosa and S. aureus. This may be due to the fact that the Klebsiella is one of the most important organisms causing nosocomial infection (Ramesh et al., 2008).
Comparison between different types of media used for the isolation of uropathogens
The analysis of the data obtained from Nutrient agar with CLED, MacConkey's agar, HiCrome UTI agar for the detection of dependence of tables 4.at 5% level of significance were tested. It was observed that N.A, CLED, MacConkey's agar, Hicrom UTI agar gave significant result when tested for dependence between the media using ttest for paired samples.Result indicated that the growth pattern of the uropathogens were different. It could be due to the different constituents and properties of the media.
The result was similar to the result of Scarparo et al. (2002) that urine specimens were considered positive and clinically significant. In all cultures of the group, the isolates developed a significant colony count. But no significant difference was observed in colony count while comparing both the media.
Number of specimens showing mixed growth were same for both media but was easily appreciated on CUM because of variation in color was reported (Qaiser et al., 2011).
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Yashab Kumar, Lata Kunj and Pramod W. Ramteke
Sam Higginbottom Institute of Agriculture, Technology and Sciences, Deemed to be University, Allahabad--211007, India.
(Received: 12 September 2016; accepted: 03 December 2016)
* To whom all correspondence should be addressed.
Caption: Plate 1. Growth on nutrient agar plate
Caption: Plate 2. Growth on CLED agar plate
Caption: Plate 3. Growth on MacConkey's agar plate
Caption: Plate 4. Growth on Hicrome UTI agar plate
Caption: Plate 5. Indole +ve, MR +ve, VP -ve, Citrate utilization -ve for Escherichia coli
Caption: Plate 6. Motility test
Caption: Plate 8. Glucose AG+, Dextrose AG+, Lactose AG+
Caption: Plate 9. Maltose AG+, Mannitol AG+, Sucrose A+G
Table 1. Characteristics of E.coli on different agar media Name of the media Characteristics Nutrient agar Opaque, smooth, flat, moist, white color colonies. CLED Opaque, yellow color colonies MacConkey's agar Pink color colonies Hicrome UTI agar Magenta color colonies Table 4. Mean values of number of colonies on different media Nutrient CLED MacConkey's Hicrome Agar Agar media UTI Agar media media 25.11 12.53 11.53 10.81 Fig. 1. Percentage of different organism isolated from urine samples Escherichia 61% Klebsiella species 19% Staphylococcus aureus 9% Proteus species 6% Pseudomonas species 5% Note: Table made from pie chart.
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|Author:||Kumar, Yashab; Kunj, Lata; Ramteke, Pramod W.|
|Publication:||Journal of Pure and Applied Microbiology|
|Date:||Mar 1, 2017|
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