Abstract
Background:
The frequency of extended-spectrum beta-lactamase (ESBL)-producing Escherichia coli strains among clinical isolates has been steadily increasing, leading to limited treatment options.Objectives:
This study aimed to assess the antibiotic sensitivity of E. coli and the frequency of ESBL isolates among both out-patients and in-patients.Methods:
A total of 390 E. coli isolates were received at the Ali-Ebn-e-Abitaleb Hospital laboratory in Rafsanjan. The antibiogram, as well as the phenotypic and genotypic detection of ESBL isolates, were conducted using Kirby-Bauer, combination disk confirmatory, and polymerase chain reaction tests, respectively.Results:
Of all the E. coli isolates, 45.6% exhibited ESBL production. Among these isolates, 46.1% were obtained from hospital wards, while 42.5% were from outpatients. Meropenem and imipenem displayed sensitivities of 97.2% and 93.3%, respectively, whereas amikacin and nitrofurantoin showed sensitivities of 89.7% and 85.6%, respectively, for all isolates. Notably, ceftriaxone, cefotaxime, cefixime, ampicillin, co-trimoxazole, and nalidixic acid demonstrated high resistance rates, surpassing 50%. ESBL-producing isolates were more frequently observed in blood samples (65%) and wounds (60%) compared to other tested isolates. Approximately 8.6% of isolates carried a single type of ESBL gene, while 38.5% carried multiple ESBL genes.Conclusions:
The data indicate a prevalence of ESBL-producing E. coli isolates among both out-patients and in-patients, with some of them acquiring two or three types of ESBL enzymes. As a result, their ability to hydrolyze antibiotics has increased, leading to their higher occurrence in clinical samples.Keywords
Extended-spectrum Beta-Lactamase Antibiotic Resistance Gene Escherichia coli In-patient Out-patient
1. Background
Escherichia coli is a significant pathogen affecting both hospitalized and non-hospitalized patients (1). The acquisition of resistance genes against commonly used antibiotics has become a growing concern in both community and hospital settings. Among the emerging and spreading isolates, extended-spectrum beta-lactamase (ESBL) E. coli strains are particularly worrisome, as they exhibit resistance to third-generation cephalosporins and aztreonam, which are commonly prescribed for severe infections in both out-patients and in-patients (2). ESBL isolates of E. coli are notably more significant than non-ESBL isolates in terms of their response to carbapenems (3). So far, approximately 300 variants of ESBL enzymes have been identified, with the most prevalent being C-TXM, TEM, and SHV (4). These enzymes differ in their hydrolyzing activity, stability, genetic composition, amino acid sequence, and susceptibility to beta-lactamase inhibitors such as clavulanic acid, tazobactam, and sulbactam (5, 6).
The prevalence of ESBL-producing E. coli exhibits geographical variation worldwide. For instance, in Germany, Canada, and Scandinavian countries, the prevalence of these isolates is below 10%. In the USA, France, Spain, Portugal, and England, it ranges from 10% to 25%. In Saudi Arabia, Japan, and Russia, the prevalence falls between 25% and 50%. Mongolia, China, India, and Pakistan show a higher prevalence range of 10% to 50%. The prevalence pattern of ESBL-E. coli in Africa is similar to that of Asian countries, ranging from 10% to 50% (1, 7, 8). In Iran, the antimicrobial resistance pattern of E. coli isolates varies from 2.5% to 100%, depending on the specific antibiotics, with an overall prevalence exceeding 50%. The prevalence of ESBL-producing isolates in different studies conducted in Iran ranged from 2.4% to 80.5%, influenced by factors such as sample type, study duration, city, and province (9, 10). Limited studies have examined the prevalence of ESBL-producing E. coli in clinical samples, specifically in the Kerman province, with three studies conducted in Kerman city and none in other cities within the province. The reported prevalence in Kerman City ranged from 35% to 65% (11-13).
2. Objectives
Given the significance of ESBL-producing E. coli isolates in the clinical setting, and to the best of our knowledge, this study represents the first investigation in Rafsanjan city that examines the antibiogram resistance pattern and frequency of ESBL-producing E. coli isolates among both out-patients and in-patients of Ali-Ebn-e-Abitaleb Hospital.
3. Methods
3.1. Sample Collection and Data Analysis
A total of 390 E. coli isolates were obtained from clinical samples of both out-patients and in-patients at Ali-Ebn-e-Abitaleb Hospital. The identification of isolates as E. coli was confirmed through biochemical tests (14). Data analysis was performed using SPSS software (version 20, IBM), utilizing independent t-student, chi-square, and analysis of variance (ANOVA) tests.
3.2. Antimicrobial Susceptibility and ESBLs Isolate Detection
Antimicrobial susceptibility testing was conducted using the Kirby-Bauer method, following the instructions provided by the Clinical and Laboratory Standards Institute (CLSI). The antimicrobial resistance of all isolates was assessed against ampicillin (30 µg), co-trimoxazole (10 µg), ciprofloxacin (30 µg), cefotaxime (30 µg), ceftriaxone (30 µg), ceftazidime (30 µg), cefixime (5 µg), gentamicin (10 µg), nitrofurantoin (30 µg), nalidixic acid (30 µg), imipenem (10 µg), amikacin (30 µg), and meropenem (10 µg) using discs obtained from Padtan Teb, Iran (14, 15). ESBL-producing E. coli strains were identified using the combination disk confirmatory test, as previously described (16). All experiments were performed in triplicate, with the E. coli ATCC 25922 strain used as a control.
3.3. DNA Extraction, CTX-M, SHV, and TEM Genes Detection
Isolate genomes were extracted using a DNA extraction kit (Karmania Pars Gene, Iran). The prevalence of common ESBL enzymes (CTX-M, SHV, and TEM) was determined among phenotypically ESBL-producing E. coli isolates. Polymerase chain reaction (PCR) was conducted using the previously described primer sets (17, 18).
4. Results
4.1. Antimicrobial Resistance
The rates of antibiotic resistance were as follows: Meropenem (2.8%), imipenem (6.7%), amikacin (10.3%), nitrofurantoin (14.4%), gentamicin (22.8%), ciprofloxacin (38.7%), ceftazidime (44.6%), cefixime (51.8%), cefotaxime (53.3%), nalidixic acid (58.2%), co-trimoxazole (63.6%), ceftriaxone (71.5%), and ampicillin (85.1%). Significant differences in antibiotic resistance were observed between males and females in all tested isolates, except for co-trimoxazole, ceftriaxone, amikacin, and nalidixic acid. Carbapenems displayed the lowest resistance rates, while the third generation of cephalosporins and cefixime exhibited the highest resistance rates. Co-trimoxazole and ampicillin antibiotics demonstrated very high resistance levels (Table 1).
Gender-related Antibiotic Resistance Among Escherichia coli Isolates Separated from Patients a
| Male (n = 94) | Female (n = 296) | Total (n = 390) | χ2 | P Value | |
|---|---|---|---|---|---|
| Meropenem | 6 (6.4) | 5 (1.7) | 11 (2.8) | 5.735 | 0.017 |
| Cefixime | 62 (66.0) | 140 (47.3) | 202 (51.8) | 9.950 | 0.002 |
| Gentamicin | 30 (31.9) | 59 (19.9) | 89 (22.8) | 5.816 | 0.016 |
| Nalidixic acid | 63 (67.0) | 164 (55.4) | 227 (58.2) | 3.957 | 0.47 |
| Imipenem | 12 (12.8) | 14 (4.7) | 26 (6.7) | 7.405 | 0.007 |
| Amikacin | 14 (14.9) | 26 (8.8) | 40 (10.3) | 2.893 | 0.089 |
| Ciprofloxacin | 58 (61.7) | 93 (31.4) | 151 (38.7) | 27.575 | 0.000 |
| Nitrofurantoin | 22 (23.4) | 34 (11.5) | 56 14.4 () | 8.240 | 0.004 |
| Ceftriaxone | 71 (75.5) | 208 (70.3) | 279 (71.5) | 0.970 | 0.325 |
| Ampicillin | 86 (91.5) | 246 (83.1) | 332 (85.1) | 3.959 | 0.047 |
| Cefotaxime | 61 (64.9) | 147 (49.7) | 208 (53.3) | 6.650 | 0.010 |
| Ceftazidime | 50 (53.2) | 124 (41.9) | 174 (44.6) | 3.243 | 0.055 |
| Co-trimoxazole | 61 (64.9) | 187 (63.2) | 248 (63.6) | 0.091 | 0.763 |
The resistance rates varied across different sample types among the isolates (Table 2). Antibacterial resistance in E. coli isolates obtained from the trachea showed rates of 14%, 13%, 34.8%, 60.9%, and 34.8% against meropenem, imipenem, amikacin, ciprofloxacin, and nitrofurantoin, respectively. The difference in resistance rates among E. coli isolates was significant for meropenem, amikacin, and nalidixic acid antibiotics, indicating a higher prevalence of resistance in E. coli from tracheal samples compared to other samples, particularly urinary samples (13% vs. 2.4%, respectively).
| Antibiotics | Urine (n = 327) | Tracheal Secretions (n = 23) | Blood (n = 20) | Wound (n = 15) | Others (n = 5) | Total (n = 390) | χ2 | P-Value |
|---|---|---|---|---|---|---|---|---|
| Meropenem | 8 (2.4) | 3 (13.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 11 (2.8) | 10.097 | 0.039 |
| Cefixime | 164 (50.2) | 11 (47.8) | 15 (75.0) | 10 (66.7) | 2 (40.0) | 202 (51.8) | 6.419 | 0.170 |
| Gentamicin | 78 (23.9) | 4 (17.4) | 5 (25.0) | 0 (0.0) | 2 (40.0) | 89 (22.8) | 5.910 | 0.206 |
| Nalidixic acid | 191 (58.4) | 13 (56.5) | 10 (50.0) | 9 (60.0) | 4 (80.0) | 227 (58.2) | 1.582 | 0.812 |
| Imipenem | 17 (5.2) | 3 (13.0) | 4 (20.0) | 1 (6.7) | 1 (20.0) | 26 (6.7) | 9.778 | 0.044 |
| Amikacin | 30 (9.2) | 8 (34.8) | 0 (0.0) | 2 (13.3) | 0 (0.0) | 40 (10.3) | 18.465 | 0.001 |
| Ciprofloxacin | 110 (33.6) | 14 (60.9) | 13 (65.0) | 10 (66.7) | 4 (80.0) | 151 (38.7) | 22.663 | 0.191 |
| Nitrofurantoin | 44 (13.5) | 8 (34.8) | 3 (15.0) | 0 (0.0) | 1 (20.0) | 56 (14.4) | 10.670 | 0.031 |
| Ceftriaxone | 232 (70.9) | 17 (73.9) | 16 (80.0) | 12 (80.0) | 2 (40.0) | 279 (71.5) | 3.796 | 0.435 |
| Ampicillin | 276 (84.4) | 21 (91.3) | 19 (95.0) | 13 (86.7) | 3 (60.0) | 332 (85.1) | 4.890 | 0.299 |
| Cefotaxime | 164 (50.2) | 15 (65.2) | 16 (80.0) | 11 (73.3) | 2 (40.0) | 208 (53.3) | 11.116 | 0.251 |
| Ceftazidime | 139 (42.5) | 11 (47.8) | 13 (65.0) | 9 (60.0) | 2 (40.0) | 174 (44.6) | 5.527 | 0.237 |
| Co-trimoxazole | 206 (63.0) | 14 (60.9) | 13 (65.0) | 12(80.0) | 3 (60.0) | 248 (63.6) | 1.913 | 0.752 |
4.2. ESBL-Producing Isolates
The total number of ESBL-producing E. coli isolates was 177 (45.4%), out of which 52.3% (52 from 94) and 42.2% (125 from 296) of cases obtained from men and women, respectively. These isolates accounted for 42.5% of outpatients and 46.1% of hospitalized patients. The prevalence of ESBL-producing isolates in different sample types was as follows: Urine (43.1%), tracheal secretions (52.2%), blood (65%), wound (60%), and other samples (40%). These differences were not statistically significant except for gender (Table 3). Overall, 45.4% of E. coli isolates were ESBL producers, with frequencies of 42.5% and 46.1% in out-patients and in-patients, respectively. The prevalence of ESBL-producing isolates in urine, tracheal secretions, blood, wound, and other samples (unknown source) was 43.1%, 52.2%, 56%, 60%, and 40%, respectively, and these differences were not statistically significant. However, a significant difference was observed in the rate of ESBL-producing E. coli between male and female patients (Table 3).
Frequency of ESBL Producing Escherichia coli Among Clinical Samples
| N | ESBL (177, %45.6), No. (%) | χ2 | P Value | |
|---|---|---|---|---|
| Gender | 4.931 | 0.026 | ||
| Male | 94 | 52 (52.3) | ||
| Female | 296 | 125 (42.2) | ||
| Patient’s status | 0.309 | 0.578 | ||
| Out-patient | 73 | 31 (42.5) | ||
| In-patient | 317 | 146 (46.1) | ||
| Sample type | 5.751 | 0.219 | ||
| Urine | 327 | 141 (43.1) | ||
| Trachea | 23 | 12 (52.2) | ||
| Blood | 20 | 13 (65.0) | ||
| Wound | 15 | 9 (60.0) | ||
| Others | 5 | 2 (40.0) |
4.3. ESBLs Types in the Out-and In-patients
Table 4 presents the distribution of ESBL types based on patients' status. The majority of isolates carried two or three ESBL genes concurrently. The most prevalent ESBL genes among the ESBL-producing isolates were TEM + CTX-M (20%) and TEM + CTX-M + SHV (14.4%). No statistically significant difference was observed in the prevalence of ESBL-producing isolates between out-patients and in-patients. A similar pattern of ESBL genes was observed between out-patients and in-patients in other sample types, including urine, tracheal secretions, blood, wound, and other samples (Table 4).
Frequency of TEM, SHV, and CTX-M ESBL Genes According to Patients’ Status (In- and Out-patient) a
| ESBLs Genes | Out-patients (n = 73) | In-patients (n = 317) | Total (n = 390) | χ2 | P-Value |
|---|---|---|---|---|---|
| SHV | 0 (0.0) | 3 (0.9) | 3 (0.8) | 5.327 | 0.620 |
| TEM | 0 (0.0) | 6 (1.9) | 6 (1.5) | ||
| CTX-M | 5 (6.8) | 14 (4.4) | 19 (4.9) | ||
| SHV + TEM | 0 (0.0) | 6 (1.9) | 6 (1.5) | ||
| SHV + CTX-M | 1 (1.4) | 9 (2.8) | 10 (2.6) | ||
| TEM + CTX-M | 13 (17.8) | 65 (20.5) | 78 (20.0) | ||
| TEM + CTX-M + SHV | 12 (16.4) | 44 (13.9) | 56 (14.4) | ||
| Negative | 42 (57.5) | 170 (53.6) | 212 (54.4) |
4.4. ESBLs Producing Escherichia coli Based on Sample Types
Most E. coli isolates were obtained from urine samples, followed by tracheal secretions, wounds, blood, and other samples. Depending on the sample type, the percentage of isolates without ESBL genes ranged from 35% to 60%. Most isolates carried two or three types of ESBLs simultaneously, with TEM + CTX-M (20%) and TEM + CTX-M + SHV (14.4%) being the most common combinations. Two or more ESBL genes were frequently found in isolates from urine, tracheal secretions, blood, and wound samples. The TEM + CTX-M combination was the most prevalent, although no statistically significant difference was observed (Table 5).
| ESBLs Genes | Urine (n = 327) | Trachea (n = 23) | Blood (n = 20) | Wound (n = 15) | Others (n = 5) | Total (n = 390) | χ2 | P-Value |
|---|---|---|---|---|---|---|---|---|
| SHV | 2 (0.6) | 1 (4.3) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 3 (0.8) | 39.593 | 0.072 |
| TEM | 5 (1.5) | 1 (4.3) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 6 (1.5) | ||
| CTX-M | 15 (4.6) | 1 (4.3) | 3 (15.0) | 0 (0.0) | 0 (0.0) | 19 (4.9) | ||
| SHV + TEM | 3 (0.9) | 2 (8.7) | 0 (0.0) | 1 (6.7) | 0 (0.0) | 6 (1.5) | ||
| SHV + CTX-M | 7 (2.1) | 0 (0.0) | 2 (10.0) | 1 (6.7) | 0 (0.0) | 10 (2.6) | ||
| TEM + CTX-M | 64 (19.6) | 3 (13.0) | 7 (35.0) | 4 (26.7) | 0 (0.0) | 78 (20.0) | ||
| TEM + CTX-M + SHV | 46 (14.1) | 4 (17.4) | 1 (5.0) | 3 (20.0) | 2 (40.0) | 56 (14.4) | ||
| Negative | 185 (56.6) | 11 (47.8) | 7 (35.0) | 6 (40.0) | 3 (60.0) | 212 (54.4) |
5. Discussion
Considering the relatively high resistance rate (around 50%) of the tested E. coli isolates against third-generation cephalosporins (ceftriaxone and ceftazidime) found in this study and similar research (19, 20), it is advisable to refrain from prescribing these antibiotics for E. coli infections. As most isolates in this study demonstrated sensitivity to nitrofurantoin and amikacin (21), it is recommended to avoid using carbapenems as a first-line treatment for severe infections (19, 21, 22). The increasing prevalence of extended-spectrum beta-lactamase-producing E. coli isolates in clinical samples is a growing concern. The prevalence of these isolates in different regions of Iran ranges from 12% to 80%. In Kerman City, the prevalence of ESBL isolates in various clinical samples was as follows: 25.9% in diarrheal samples, 43.7% in urinary samples, and 68% in other tested clinical samples (9).
According to the World Health Organization's report, the prevalence of ESBL E. coli isolates worldwide ranges from 10% to 50%. In specific regions, the percentages vary, such as Iran (25 - 50%), China, India, and Pakistan (more than 50%), United States, France, Russia, and Britain (10 - 25%), and Scandinavian countries, Germany, and Australia (less than 10%) (22). In the present study, the prevalence of ESBL-producing strains in Rafsanjan (45.6%) was found to be similar to Zabol (44.4%), Tehran (50%), and Kashan (46%), higher than Sanandaj (19.02%), Semnan (17.46%), and Shiraz (12.96%), and lower than Arak (80.5%), Tehran (70%), and Tabriz (66.2%) (9). The prevalence of ESBL-producing E. coli in this study is relatively similar to or lower than that in developing countries and higher than in developed countries. It is crucial to avoid the inappropriate use of antibiotics for treating E. coli and other bacterial infections to prevent further challenges for the healthcare system.
While previous reports have suggested that the prevalence of ESBL-producing E. coli isolates does not show a gender preference (23), our findings indicate a higher rate of these isolates in males compared to females (52.3% vs. 42.2%). This observation aligns with the study conducted by Yousefipour et al. (64.6% vs. 55.3%), where both groups consisted of hospitalized patients (19). However, our results contradict the study by Hung et al., which showed a higher prevalence in women than in men (52.1% vs. 47.9%) (24). Although the majority of E. coli isolates were obtained from hospitalized patients of both genders and from urine samples, based on our data, we cannot provide a definitive explanation for the increased presence of ESBL-producing isolates in male patients.
The prevalence of ESBL-producing E. coli varies in terms of the responsible genes. Some studies have reported the TEM gene as the most common, while others have identified the SHV gene as predominant (25-27). In our study, consistent with many other investigations, CTX-M was found to be the most prevalent gene (10), which has also been reported in several previous studies (28, 29). These findings highlight the simultaneous presence of two or more ESBL genes in a single clinical isolate, indicating their clinical significance, although it has been discussed to a lesser extent. Similar to other studies, a significant proportion of our isolates demonstrated the presence of two or more ESBL genes concurrently (28, 29). This simultaneous presence of multiple ESBL enzyme variants signifies a higher level of enzyme production and greater antibiotic degradation. Consequently, this contributes to the increased severity of infections and the prevalence of such isolates among patients.
5.1. Conclusions
Considering the high sensitivity of the isolates in our study to amikacin and nitrofurantoin, it is advisable to utilize these antibiotics for the treatment of E. coli infections. The findings indicate a growing concern regarding ESBL-producing E. coli isolates in both out-patient and in-patient settings, particularly those harboring multiple types of ESBL enzymes. Consequently, these isolates exhibit enhanced antibiotic hydrolysis capabilities and have become increasingly prevalent in clinical samples.
Acknowledgements
References
-
1.
Lee DS, Lee SJ, Choe HS. Community-acquired urinary tract infection by escherichia coli in the era of antibiotic resistance. Biomed Res Int. 2018;2018:7656752. [PubMed ID: 30356438]. [PubMed Central ID: PMC6178185]. https://doi.org/10.1155/2018/7656752.
-
2.
Wibisono FJ, Sumiarto B, Untari TRI, Effendi MH, Permatasari DA, Witaningrum AM. Short communication: Pattern of antibiotic resistance on extended-spectrum beta-lactamases genes producing Escherichia coli on laying hens in Blitar, Indonesia. Biodiversitas Journal of Biological Diversity. 2020;21(10). https://doi.org/10.13057/biodiv/d211022.
-
3.
Pandit R, Awal B, Shrestha SS, Joshi G, Rijal BP, Parajuli NP. Extended-spectrum beta-Lactamase (ESBL) genotypes among multidrug-resistant uropathogenic Escherichia coli clinical isolates from a teaching hospital of Nepal. Interdiscip Perspect Infect Dis. 2020;2020:6525826. [PubMed ID: 32377184]. [PubMed Central ID: PMC7181012]. https://doi.org/10.1155/2020/6525826.
-
4.
Bajpai T, Pandey M, Varma M, Bhatambare GS. Prevalence of TEM, SHV, and CTX-M Beta-Lactamase genes in the urinary isolates of a tertiary care hospital. Avicenna J Med. 2017;7(1):12-6. [PubMed ID: 28182026]. [PubMed Central ID: PMC5255976]. https://doi.org/10.4103/2231-0770.197508.
-
5.
Petrosino J, Cantu C3, Palzkill T. beta-Lactamases: protein evolution in real time. Trends Microbiol. 1998;6(8):323-7. [PubMed ID: 9746943]. https://doi.org/10.1016/s0966-842x(98)01317-1.
-
6.
Medeiros AA. Evolution and dissemination of beta-lactamases accelerated by generations of beta-lactam antibiotics. Clin Infect Dis. 1997;24 Suppl 1:S19-45. [PubMed ID: 8994778]. https://doi.org/10.1093/clinids/24.supplement_1.s19.
-
7.
Bezabih YM, Sabiiti W, Alamneh E, Bezabih A, Peterson GM, Bezabhe WM, et al. The global prevalence and trend of human intestinal carriage of ESBL-producing Escherichia coli in the community. J Antimicrob Chemother. 2021;76(1):22-9. [PubMed ID: 33305801]. https://doi.org/10.1093/jac/dkaa399.
-
8.
Larramendy S, Deglaire V, Dusollier P, Fournier JP, Caillon J, Beaudeau F, et al. Risk factors of extended-spectrum beta-lactamases-producing escherichia coli community acquired urinary tract infections: A systematic review. Infect Drug Resist. 2020;13:3945-55. [PubMed ID: 33177845]. [PubMed Central ID: PMC7650195]. https://doi.org/10.2147/IDR.S269033.
-
9.
Alizade H. Escherichia coli in Iran: An overview of antibiotic resistance: A review article. Iran J Public Health. 2018;47(1):1-12. [PubMed ID: 29318111]. [PubMed Central ID: PMC5756583].
-
10.
Rehman N, Azam S, Ali A, Khan I, Asghar M, Ali M, et al. Molecular epidemiology of antibiotic-resistant genes and potent inhibitors against TEM, CTX-M-14, CTX-M-15, and SHV-1 proteins of Escherichia coli in district Peshawar, Pakistan. Saudi J Biol Sci. 2021;28(11):6568-81. [PubMed ID: 34764772]. [PubMed Central ID: PMC8569001]. https://doi.org/10.1016/j.sjbs.2021.07.028.
-
11.
Kalantar D, Mansouri S. Emergence of multiple [Beta]-lactamases produced by Escherichia coli clinical isolates from hospitalized patient in Kerman, Iran. Jundishapur J Microbiol. 2010;3(4):137-45.
-
12.
Alizade H, Fallah F, Ghanbarpour R, Alatoonian MR, Goudarzi H, Sharii H. Phylotyping of bla CTX-M-15 gene in extended spectrum beta lactamase producing Escherichia coli isolates from clinical samples in Iran. Adv environ sci. 2014;6(4).
-
13.
Mansouri S, Kalantar Neyestanaki D, Shokoohi M, Halimi S, Beigverdi R, Rezagholezadeh F, et al. Characterization of AmpC, CTX-M and MBLs types of β-lactamases in clinical isolates of Klebsiella pneumoniae and Escherichia coli producing extended spectrum β-lactamases in Kerman, Iran. Jundishapur J Microbiol. 2014;7(2). https://doi.org/10.5812/jjm.8756.
-
14.
Behrooozi A, Rahbar M, Yousefi JV. Frequency of extended spectrum beta-lactamase (ESBLs) producing Escherichia coli and Klebseilla pneumonia isolated from urine in an Iranian 1000-bed tertiary care hospital. Afr J Microbiol Res. 2010;4(9):881-4.
-
15.
Ahmed OB, Omar AO, Asghar AH, Elhassan MM, Al-Munawwarah AM. Prevalence of TEM, SHV and CTX-M genes in Escherichia coli and Klebsiella spp Urinary Isolates from Sudan with confirmed ESBL phenotype. Life Sci J. 2013;10(2):191-5.
-
16.
Goudarzi G, Baharvand Ahmadi1 A. The occurrence of TEM gene among the extended-spectrum β-lactamases (ESBLs) producing uropathogenic Escherichia coli strains, isolated from Khorramabad city in 2013. Pajoohande J. 2015;20(1):33-7. Persian.
-
17.
Monstein HJ, Ostholm-Balkhed A, Nilsson MV, Nilsson M, Dornbusch K, Nilsson LE. Multiplex PCR amplification assay for the detection of blaSHV, blaTEM and blaCTX-M genes in Enterobacteriaceae. APMIS. 2007;115(12):1400-8. [PubMed ID: 18184411]. https://doi.org/10.1111/j.1600-0463.2007.00722.x.
-
18.
Dutour C, Bonnet R, Marchandin H, Boyer M, Chanal C, Sirot D, et al. CTX-M-1, CTX-M-3, and CTX-M-14 beta-lactamases from Enterobacteriaceae isolated in France. Antimicrob Agents Chemother. 2002;46(2):534-7. [PubMed ID: 11796372]. [PubMed Central ID: PMC127047]. https://doi.org/10.1128/AAC.46.2.534-537.2002.
-
19.
Yousefipour M, Rasoulinejad M, Hadadi A, Esmailpour N, Abdollahi A, Jafari S, et al. Bacteria producing extended spectrum beta-lactamases (ESBLs) in hospitalized patients: Prevalence, antimicrobial resistance pattern and its main determinants. Iran J Pathol. 2019;14(1):61-7. [PubMed ID: 31531102]. [PubMed Central ID: PMC6708561]. https://doi.org/10.30699/IJP.14.1.61.
-
20.
Iqbal Z, Mumtaz MZ, Malik A. Extensive drug-resistance in strains of Escherichia coli and Klebsiella pneumoniae isolated from paediatric urinary tract infections. J Taibah Univ Med Sci. 2021;16(4):565-74. [PubMed ID: 34408614]. [PubMed Central ID: PMC8348552]. https://doi.org/10.1016/j.jtumed.2021.03.004.
-
21.
Fazeli H, Moghim S, Zare D. Antimicrobial resistance pattern and spectrum of multiple-drug-resistant Enterobacteriaceae in Iranian Hospitalized patients with cancer. Adv Biomed Res. 2018;7:69. [PubMed ID: 29862218]. [PubMed Central ID: PMC5952526]. https://doi.org/10.4103/abr.abr_164_17.
-
22.
Doi Y, Iovleva A, Bonomo RA. The ecology of extended-spectrum beta-lactamases (ESBLs) in the developed world. J Travel Med. 2017;24(suppl_1):S44-51. [PubMed ID: 28521000]. [PubMed Central ID: PMC5731446]. https://doi.org/10.1093/jtm/taw102.
-
23.
Bazzaz BS, Naderinasab M, Mohamadpoor AH, Farshadzadeh Z, Ahmadi S, Yousefi F. The prevalence of extended-spectrum beta-lactamase-producing Escherichia coli and Klebsiella pneumoniae among clinical isolates from a general hospital in Iran. Acta Microbiol Immunol Hung. 2009;56(1):89-99. [PubMed ID: 19388560]. https://doi.org/10.1556/AMicr.56.2009.1.7.
-
24.
Hung WT, Cheng MF, Tseng FC, Chen YS, Shin-Jung Lee S, Chang TH, et al. Bloodstream infection with extended-spectrum beta-lactamase-producing Escherichia coli: The role of virulence genes. J Microbiol Immunol Infect. 2019;52(6). [PubMed ID: 31076319]. https://doi.org/10.1016/j.jmii.2019.03.005.
-
25.
Al-Subol I, Youssef N. Prevalence of CTX-M, TEM and SHV beta-lactamases in clinical isolates of Escherichia coli and Klebsiella pneumoniae isolated from Aleppo University Hospitals, Aleppo, Syria. Archives of Clinical Infectious Diseases. 2015;10(2). https://doi.org/10.5812/archcid.22540.
-
26.
Fils LM, Esther NON, Christian AK, Etienne N, Rachel M, Simon CK. First report of the types TEM, CTX-M, SHV and OXA-48 of beta-lactamases in Escherichia coli, from Brazzaville, Congo. African Journal of Microbiology Research. 2019;13(8):158-67. https://doi.org/10.5897/ajmr2018.9042.
-
27.
Islam MS, Sobur MA, Rahman S, Ballah FM, Ievy S, Siddique MP, et al. Detection of bla(TEM), bla(CTX-M), bla(CMY), and bla(SHV) genes among extended-spectrum beta-lactamase-producing Escherichia coli isolated from migratory birds travelling to Bangladesh. Microb Ecol. 2022;83(4):942-50. [PubMed ID: 34312710]. [PubMed Central ID: PMC8313370]. https://doi.org/10.1007/s00248-021-01803-x.
-
28.
Gniadkowski M. Evolution and epidemiology of extended-spectrum beta-lactamases (ESBLs) and ESBL-producing microorganisms. Clin Microbiol Infect. 2001;7(11):597-608. [PubMed ID: 11737084]. https://doi.org/10.1046/j.1198-743x.2001.00330.x.
-
29.
Shaikh S, Fatima J, Shakil S, Rizvi SM, Kamal MA. Antibiotic resistance and extended spectrum beta-lactamases: Types, epidemiology and treatment. Saudi J Biol Sci. 2015;22(1):90-101. [PubMed ID: 25561890]. [PubMed Central ID: PMC4281622]. https://doi.org/10.1016/j.sjbs.2014.08.002.