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Evaluation of Enterococcus Bacterial Contamination in water supplies of Iran.


In connection with the study of composition and function of aquatic ecosystems, our aims to determine the factors affecting water quality and identifying biological ecology and other aspects of microbial communities present in the water. According to some studies, E.coli known for its many attributes are not considered core [1]. In recent years microorganisms of the genus Enterococcus with regard to resistance to most antimicrobial materials, lighting, Low temperature also influences the resistance to physical, chemical and biological increased [3]. Currently, taking account of epidemiological enterococci have special place, In addition, many studies have been conducted on pathogenic microorganisms and Finding VBNC [possess growth potential, but it cannot be cultured] can be increased, At this time Bacterial cells retained their ability to grow, but they do not come up in the culture medium [3]. The term of "enterococcus" for organisms in saline 6.5% Temperature 10 to 45 [degrees]C and PH 9.6 grown and to live at 60 [degrees]C for 30 minutes [4]. S.faecalis and S.Gallinarum Faecium in 1919 by Avrla Johnson are illustrated as a species of S.faecalis in the first picture was Sherman [4]. According to the species, S. faecalis, S. Faecium, S. Kaslyflavvs, S. avium, and S.Durans varieties Maluduratus Being named separately [5]. Using similar methods, the authors showed that S. Faecium, S. faecalis, S. Kaslyflavvs, S. avium, S.Durans, under the strain of S.Maluduratus Gallinarum very closely with representatives of the genus Enterococcus [5-8]. Williams and his colleagues was suggested the genus Enterococcus divided into 5 groups according to gene sequence16SrRNA [9]. Among isolates 80-90 % maladies such as Enterococcus Gallinarum, Enterococcus Flavysus -, Enterococcus Kaslyflavus, E. Hirae's somewhat important [10]. Genus Enterococcus vampire among organisms, gram-positive anaerobic are optional, Round or oval- shaped cells Pairs, short chains, mass concrete in small or isolated cells observed [10]. These organisms lack the enzymes of the cytochrome oxidase and catalase negative; some species are false positive catalase [8, 11]. Enterococci are widely distributed in nature [2, 12] and they are also part of the intestinal flora of Humans, mammals and birds [13]. Sometimes are also observed in the flora of genital tract, mouth, throat and nose [14]. A long time to survive in the soil and food and are able to grow at room temperature. The effects of physical, chemical and biological show resistance [2]. In the new hospitals have shown Enterococcus bacteria resistance because of use terms of new types of antibiotics and survival continued [15]. In Urinary tract infections, Enterococcus faecalis are the second cause of them after intestinal bacilli [16]. It is thought Enterococcus faecalis produce Cytotoxin lysis of erythrocyte and neutrophils. Synthesis of the cytotoxin Show high resistance against chemicals [17]. That is clear the Enterococcus faecalis possess proteolytic activity and hydrolysis a series of proteins, gelatin, casein, collagen, hemoglobin, etc. Bacteria will persistence Long-term in the genitourinary tract [18]. Important factor assessing innocuous enterococci resistant to essential antibiotics, particularly glycopeptides. Eliminate the causes of antibiotic resistance genes in the origin of the genus Enterococcus probiotics and yeast before use is necessary [19]. All the above mentioned play a major role in the development process and considering the pathogenesis of Enterococcus Special doctor's attention is captured. The first is that in the water samples and the boundary in the distribution and dynamics of bacteria Genus Enterococcus were investigated and was analyzed its effect on bacterial flora status. Our objective, To investigate the distribution of bacteria in the genus Enterococcus, identify characteristics and species And assessment of antibiotic resistance genes. The aim of the present study was to evaluate the presence of Enterococcus Bacterial Contamination in boundary Water Supplies of Iran.


This study was conducted on boundary water supplies of Iran such as Aras, Karon, Sefid rivers. Bacterial samples were evaluated by means of an advanced microbiological technique specific for anaerobic species, which was used for isolation and identification of sampled strains. The main areas of research are produced water samples and samples of pathological material to isolate bacteria Enterococcus. Used media were: blood agar, BHI [agar containing brain extracts and heart], 1% sodium chloride, bile esculin agar, hydrogen peroxide, the medium containing glucose, mannitol and arginine -containing medium. In Water samples used doping method for culture and set of values produced by bacteria of the genus Enterococcus. Contamination about 50 ml was determined by taking samples from the water supply. Sampling was carried out according to the asepsis instructions described previously [1]. We across water from membrane filter with 0.45 mm mesh, for 48 hours at a temperature of 37 [degrees] C in slanova-Borteli incubation. Bacteria in the genus Enterococcus medium produced red-pink colonies. In addition urine, feces, blood and wound fluid, peritoneal fluid, In door domestic and bone marrow biopsy and synovial fluid were taken. The sample incubation at 37[degrees]C for 30 min and then for 60 seconds were centrifuged. Peptone water containing one per cent, respectively, carried 10 times dilution. Each of them 0.1 ml was removed to the surface of Brucella agar/dilution of Cultivated. Plates in anaerobic conditions for 48 hours were taken. The medium incubation temperature was 44[degrees]C for 2 hours. Fecal origin enterococci were hydrolysing esculin. Finally, hydrolysis of esculin is produced 6,7 Dihydroxy coumarin, it is combined with iron ions diffuse black pigment in The medium creates. Evaluate of resistance to antibiotics with Discs containing antibiotics, after placing the discs, plates for 24 hours at a temperature of 37 [degrees]C Were incubation. Depending on the growth of microorganisms in the surrounding disk, bacteria were divided into three categories: Sensitive, intermediate resistant.


A total of 306 strains of the genus Enterococcus were isolated Iranian waters such as Enterococcus faecalis, Enterococcus faecium, Enterococcus avium, E. Mundtii, E. Hirae, E. Durans. E. Gallinarum is dominant and unequal distribution of the nature and characteristics depending on the location.




Enterococcus isolates were detected in 143 clinical samples, 105 isolates of them were Enterococcus faecalis, 38 Enterococcus isolates were Faecium.

Genus Enterococcus were isolated from the wastewater of 92 isolates, 68 isolates of Enterococcus Faecium and 24 isolates were Enterococcus faecalis.

From 105 Enterococcus faecalis strains isolated from clinical samples 3.6% resistance to Vancomycin has shown, 24 Enterococcus faecalis isolated from a wastewater samples 4.2% resistance to Vancomycin.

From 105 Enterococcus faecalis strains isolated from clinical samples 36.2% resistance to Gentamicine has shown and 24 Enterococcus faecalis isolated from a wastewater samples 4.2%% resistance to Gentamicine.





Discussion and Conclusions:

Enterococci is representative of macrobiotic natural human intestine and in this way the amounts of them release to the environments assessing the quality of surface water basins of the bacteriology and hygiene, as a health indicator is the base of existence of microorganisms in water. According to studies, E.Coli characteristics cannot be considered as the only criterion for water sanitation, for this reason, according to the Europ Union, also determine of existence of E.Coli is necessary to determine enterococci with the origin of stool. There are two principal methods for determining Entercocci levels: titration and passing the filter. The second method has a high priority because it gives an accurate count of the microorganisms present in the sample. Enterococcis grow easily on conventional environment, while the environment should contain inhibitors of other microbial growth. The investigation shows that the majority of bacteria from genus of Enterococcus in sample stations around the Poldasht and Larijan cities are in order to 33 and 36 cfu per 100 ml. The highest degree of pollution around Julfa exceeded registered with 125 cfu per 100 ml. The Enterococcus was observed in samples of around the other cities too, and their values were changeable between 12 cfu per 100 ml [Janlu] and 25 cfu per 100 ml [Khomarlu].

According to the investigation comes that high potential pathogenic microorganisms from Enterococcus genus can be seen in water samples taken from the Delta Manjil Dam and this is essential that the health and care and environmental conditions are monitored. Enterococcis are also located in different places in the prepared samples were observed, such as Makser 4 cfu per 100 ml-Shoosh 3 cfu per 100 ml-Khoramshahr 2 cfu per 100 ml and Abadan 1 cfu per 100 ml.

Based on these results, it was clear that accumulation of organic matter and bionutrients, releasing agricultural wastes in the flow path is linked with the Karun pollution with Enterococcis. A total of 4 % of the bacteria isolated in the present study was to possess hemolytic activity. From 5 types of them are Betahemolytic and 5types of them are Alpha-hemolytic and the other types were induced erythrocyte hemolysis. Noteworthy among the bacteria isolated from Karun, no one has hemolytic's activity and this effect is result of the lower of developmental impact [antropogen] of surrounding area.

Genus Enterococcus were isolated from the pathological samples some of them [32] related with aac[6]-lealpha[2]-la, and 3 genus of them related with alpha[2]-lb,3 genus related with boreaph[2]-ld and non of them related with alpha[2]-lc. Genus Enterococcus were isolated from the wastewater some of them [17] related with aac[6]-le-alpha[2]-la, and 1 genus of them related with alpha[2]- lb,2 genus related with boreaph[2]-ld and non of them related with alpha[2]-lc.


[1] Edberg, S.C., J.E. Patterson and D.B. Smith, 1994. Differentiation of distribution systems, source water, and clinical coliforms by DNA analysis. J clin microbial, 32: 139-142.

[2] Michael, S., Gilmore, 2002. The Enterococci: Pathogenesis, Molecular Biology, and Antibiotic Resistance. ASM Press, 439.

[3] Bogosian, G., Morris, P.J. J.P O'neil. A mixed culture recovery method indicates that enteric bacteria do not enter the viable but nonculturable state._Applied and environmental microbiology, 64[5] :1736-42.

[4] James, M., Sherman, 1983. The Enterococci and Related StreptococciJ Bacteriol, 35[2]: 81-93.

[5] Farrow, J.A., D. Jones, B.A. Phillips, 1983. Collins MD. Taxonomic studies on some group D streptococci. J Gen Microbiol, 129[5]:1423-32.

[6] Matthew, D., l. Collins, A. John, Farrow, 1986. Dorothy J. Enterococcus mundtii sp. nov. International Journal of Systematib Bacteriology, 8-12.

[7] Collins, M.D., D. Jones, J.A.E. Farrow, et al., 1984._ Enterococcus avium nom. rev, comb. nov.; E. casseliflavus nom. rev., comb. nov.; E. durans nom. rev., comb. nov.; E. gallinarum comb. nov.; and E. malodoratus sp. nov. JSEM, 34[2]: 220-223.

[8] Facklam, R.R., M.D. Collins, 1989. Identification of Enterococcus species isolated from human infections by a conventional test scheme. J Clin Microbiol, 27[4] :731-4.

[9] Williams, A.M., U.M. Rodrigues, M.D.I. Collins, 1991. Ntrageneric relationships of enterococci as detrmined by reverse transcriptase sequencing of small-subunit rRNA. Res in Microbiol, 142: 67-74.

[12] Bergey's manual determinative bacteriology /Eds.Holt J.A. et al., 1997. Baltimore: Williams and Wilkins, 787.

[13] Catrenich, C.E., K.M. Makin, 1991. Characterization of the morphologic conversion of Helicobacter pylori from bacillary to coccoid forms. Scand J Gastroenterol Suppl, 181:58-64.

[14] Murray, B.E., 1990. The life and times of the Enterococcus. Clin Microbiol Rev., 3[1]: 46-65.

[15] Barbara, E., M.D. Murray, 1997. Vancomycin-resistant enterococci, 102[3]: 284-293.

[16] Basualdo, J., M. Sparo, P. Chiodo, M. Ciarmela, M. Minvielle, 2007. Oral treatment with a potential probiotic [Enterococcus faecalis CECT 7121] appears to reduce the parasite burden of mice infected with Toxocara canis. Ann Trop Med Parasitol, 101[6]:559-62.

[17] Lilia, Macovei and Ludek Zurek, 2006. Ecology of Antibiotic Resistance Genes: Characterization of Enterococci from Houseflies Collected in Food Settings. Appl. Environ. Microbiol, 72[6]: 4028-4035.


[19] Coque, T.M., J.E. Patterson, J.M. Steckelberg, B.E. Murray, 1995. Incidence of hemolysin, gelatinase, and aggregation substance among enterococci isolated from patients with endocarditis and other infections and from feces of hospitalized and community-based persons. J Infect Dis., 171 [5] :1223-9.

[20] Moussa, S., Diarra, Heidi Rempel, Julie Champagne, Luke Masson, Jane Pritchard and Edward Topp, 2010. Distribution of Antimicrobial Resistance and Virulence Genes in Enterococcus spp. and Characterization of Isolates from Broiler Chickens.Appl. Environ. Microbiol, 76[24]: 8033-8043.

[21] Arturo Anadon, Maria Rosa Martinez-Larranaga, Maria Aranzazu Martinez, 2006. Probiotics for animal nutrition in the European Union. Regulation and safety assessment. Regulatory Toxicology and Pharmacology 45: 91-95.

[22] Castro, M.S., M.A. Molina, P. Di Sciullo, M.B. Azpiroz, F. Leocata Nieto, N.B. Sterin-Speziale, C. Mongini, M.A. Manghi, 2010. Beneficial activity of Enterococcus faecalis CECT7121 in the antilymphoma protective response. J Appl Microbiol, 109[4]:1234-43.

[23] Karl, H., Schleifer and Renate, 1984. Kilpper-Balz. Transfer of Streptococcus faecalis and Streptococcus faecium to the Genus Enterococcus nom. rev. as Enterococcus faecalis comb. nov. and Enterococcus faecium comb. nov. IJSEM, 34[1]: 31-34.

[24] Shlaes, D.M., A. Bouvet, C. Devine, J.H. Shlaes, S. al-Obeid and R. Williamson, 1989. Inducible, transferable resistance to vancomycin in Enterococcus faecalis A256._ Antimicrob Agents Chemother, 33[2]: 198-203.


Article history:

Received 25 March 2014

Received in revised form 20 April 2014

Accepted 15 May 2014

Available online 5 June 2014

(1) Esrafil Balaei Gajan, (2) Parisa Falsafi, (1) Jafar Sadjadi Oskoee

(1) Department of Community Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran

(2) Department of Oral Medicine, School of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran

Corresponding Author: Jafar Sadjadi Oskoee, Department of Community Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
Table 1: Strains of the genus E.

Source    Sample locations             The dominant species

Aras          Parsabad                      E. Faecium
               Larijan               E. Faecium, E. Faecalis
              Aslanduz          E. Faecium, E. Faecalis, E. Avium,
                                            E. mundtii

                                E. Durans, E. Gallinarum, E. Hirae
              Jananloo                 E. Avium, E. Faecium

Sefid          Roudbar          E. Faecalis, E. Avium, E. Faecium
                               E. Mundtii, E. Gallinarum , E. Hirae
               Sangar            E. Mundtii, E. Hirae, E. Durans
                               E. Faecium , E. Faecalis , E. avium
               Saramin                E. Faecium , E. Durans

Karun           Ahvaz                 E. Faecium , E. Avium
            Khorramshahr                    E. Faecium
              Shoshtar                       E. Avium
           Masjed Soleiman           E. Faecium , E. Mundtii
              Sheibani                     E. Faecalis
               Abadan                E. Faecium, E. Faecalis

Table 2: Enterococci in pathological or clinical samples.

Clinical Samples         Cfu/100m

                         Enterococcus    Enterococcus
                           faecalis         faecium

Urine                         37              21
Stool                         21               5
Purulent fluid inside         12               4
Blood and plasma              18               5
Peritoneal fluid              17               3
Total                         105             38
Amount [%]                   73.4            26.6

Clinical Samples         Cfu/100m

                         Enterococcus    Total

Urine                         --           58
Stool                         --           26
Purulent fluid inside                      16
Blood and plasma              --           23
Peritoneal fluid              --           20
Total                         --          143
Amount [%]                    --          100

Table 3: Sensitivity to antibiotics of E.faecalis
and E.faecium.

Antibiotics                                E.faecalis    E. faecium

cl-Am-sgn-te-Gm-Na-Dx-E-ox-nit-liz-cip        49.60         49.89
V-d-sgn-sxt-Te-Gm-Na-ox-E-Dx-liz              50.8          51.12
d-Am-sgn-Te-Gm-Na-ox-Dx-nit-dp                55.52         51.32
cl-Am-sgn-Gm-Na-Dx-E-Ox-Dx-nit-liz            51.59         42.78

d-Am-sgn-Te-Gm-Na-E-Qx-Dx-liz                 53.13         48.44
d-Amsgn-sxt-Gm-Na-Ox-Dx-nit-dp                52.78         50.56
d-sgn-sxt-Te-Gm-Na-Ox-Dx-nit-dp               58.38         48.16
d-sgn-sxt-Gm-Na-E-Ox-Dx-I-iz-n-it             49.09         42.66
d-Am-sgn-sxt-Na-e-Ox-Dx-Iiz                   51.45         47.02
d-sgn-sxt-te-Gm-Na-E-Dx-n-it                  47.17         46.51
d-Am-sgn-sxt-te-Na-E-Dx-nit-liz               45.14         42.34
d-Am-sgn-sxt-Gm-Na-E-Dx-liz                   45.14         48.26
d-sgn-sxt-Na-E-nit-Ox-cip                     54.84         47.60
d-sgn-sxt-Na-E-Dx-nit                         50.94         40.20
d-sgn-sxt-Na-Te-Dx-nit-Ox                     62.95         40.42
d-sgn-sxt-Gm-Na-Dx-liz-Ox-dp                  54.14         46.04
d-sgn-sxt-Gm-Na-E-Ox-liz-nit                  49.65         43.28
Am-sgn-sxt-Na-Ox-E-Dx-nit                     57.07         51.67
d-sgn-sxt-Na-Ox-liz-cip                       58.15         42.74
d-sgn-Te-Na-E-Ox-liz                          60.58         40.88
d-sgn-Na-Ox-Dx-nit-cip                        59.08         38.34
Na-Dx-liz-Ox-nit-cl-A-te                      49.71         34.77
V-E-Am-gm-cip-Ox-sxt                          40.54         79.02

V: vankomisin, E: errtromisin. A: amitsasin. Am: ampisilin,
6m: gentamisin, dp: tsiproflaksin, cl: xloramfenikol, Te;
tetrasiklin, sgn: sinersid. Tei: teikoplanin, nit:
nitroforantin. Ox: oksatsilin, sxt: trimetoprim, liz:
linezolid, Na: nadiliks tursusu, Dx: doksitsiklin-

Table 4: Sensitivity to antibiotics of genus Enterococcus
isolated from pathological samples.

%-la            V      E     A      Am     Gm     Cl    Te    Sgn

E. faecalis    3.6    29     40     27    36.2    20    83    100
E. faecium      85    84    3.7    8.3     78     18    59    6.2

%-la           Tei     nit    Ox    cip    sxt    liz    Na    Dx

E. faecalis    3.3    18.6    93     44     51    5.1    94    44
E. faecium      48     8.2    67     80     76     0     52    34

V: vankomisin, E: errtromisin, A: amitsasin, Am: ampisilin,
Gm: gentamisin, cip: tsiproflaksin, cl: xloramfenikol, Te;
tetrasklin, sgn: sinersid, Tei. teikoplanin, nit.
nitroforantin, Ox: oksatsilin, sxt: trimetoprim. liz:
linezolid. Na: nadilks tursusu. Dx: doksitsiklin-

Table 5: Sensitivity to antibiotics of genus Enterococcus
isolated from waste water samples

%-la            V      E    Am    Gm    Cl    Te

E. faecalis    4.2    32    22    30    24    79
E. faecium      3     47    34    36    28    41

%-la           sgn    Tei     Nit    Cip    Liz

E. faecalis    100     2     12.4     48     1
E. faecium     1.3    3.1     28      62    0.8

Fig. 4: Genus Enterococcus bacteria isolated from water supplies of

E. Gallinarum   5%
E. durans       6%
E. hirae        8%
E. mundtii      15%
E. faecalis     16%
E. avium        17%
E. faecium      33%

Note: Table made from Pie chart.

Fig. 5: Genus Enterococcus bacteria isolated from different areas of
the Aras River.

E. Gallinarum   2%
E. durans       7%
E. hirae        5%
E. mundtii      5%
E. faecalis     20%
E. avium        14%
E. faecium      47%

Note: Table made from Pie chart

Fig. 6: Genus Enterococcus bacteria isolated from different regions of
the Sefid River.

E. Gallinarum   7%
E. durans       6%
E. hirae        10%
E. mundtii      21%
E. faecalis     12%
E. avium        18%
E. faecium      26%

Note: Table made from Pie chart.

Fig. 7: Genus Enterococcus bacteria isolated from different regions of
the Karun River.

E. mundtii    11%
E. faecalis   22%
E. avium      22%
E. faecium    45%

Note: Table made from Pie chart
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Article Details
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Author:Gajan, Esrafil Balaei; Falsafi, Parisa; Oskoee, Jafar Sadjadi
Publication:Advances in Environmental Biology
Article Type:Report
Geographic Code:7IRAN
Date:Jun 20, 2014
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