فهرست مطالب reza ghanbarpour

Salmonella species (spp) are the most prevalent zoonotic pathogens that cause outbreaks of gastroenteritis worldwide. Therefore evaluation of the profile of antibiotic resistance, virulence factors, and plasmid replicon types in these bacteria is necessary to control and prevent the spread of potentially pathogenic and drug-resistant strains.

This study was performed on 39 Salmonella spp. The antibacterial susceptibility of isolates to various antibiotic agents was determined using disk diffusion test. β-lactamases (bla) including ESBLs, AmpC, MBLs, and virulence genes were detected by PCR methods. Plasmid incompatibility groups among the isolates were identified using PCR-based replicon typing (PBRT).

The most prevalent virulent gene was phoP/Q (84.6%). slyA, sopB, and stn were identified in 79.4% (n=31), 69.2% (n=27), and 2.5% (n=1) of the isolates, respectively. The antibiotic susceptibility testing showed that 30.7% of the isolates were ESBL-producing. bla TEM (41%; n=16) was the most frequent β-lactamase gene among the isolates followed by bla NDM-1 (15.4%; n=6), bla DHA (7.7%; n=3), and bla CTX-M (1.5%; n=1). Six different plasmid replicon types, including IncP (n=9; 23%), IncFIC (n=3; 7.70%), IncY (n=3; 7.70%), IncI1-Iγ (n=2; 5.12%), IncFIIAs (n=1; 2.56%), and IncN (n=1; 2.56%) were ob- served among the isolates.

Our study showed the emergence of carbapenem-resistant and bla NDM-1 among Salmonella spp. for the first time in Kerman, Iran. Since Salmonella spp. plays an important role in the transmission of resistance genes in livestock and humans in the food chains, so more stringent control policies are recommended to prevent the circulation of drug-resistant and potentially pathogenic strains from animals to humans.

Antibiotics are widely used to treat infectious diseases in humans and animals. However, the indiscriminate use of antibiotics contributes to the emergence of antibiotic-resistant bacteria, making infections more difficult to treat. In this study, we randomly collected thirty-six rainbow trout fish from various retail stores in Kerman city, located in the southeast of Iran. Skin samples were obtained from each fish using a swab, and Escherichia coli (E. coli) isolates were identified and screened for antimicrobial resistance (AMR) phenotypes, as well as related genes, using microbiological culturing, disc diffusion, and conventional PCR methods. Our findings showed that the prevalence of phenotypic resistance against the tested antibiotics was high, with erythromycin (88.57%), florfenicol (77.14%), oxytetracycline (74.28%), trimethoprim-sulphamethoxazole (71.42%), trimethoprim (65.71%), chloramphenicol (62.85%), flumequine (60%), ciprofloxacin (54.28%), and tetracycline (54.28%) having the highest resistance rates. Moreover, 8.57% of the E. coli isolates were found to be ESBL-producing strains, and 74.28% of the isolates were multi-drug resistant (MDR). The highest frequencies of antibiotic resistance genes were 5.71 % for blaTEM, 14.28% for qnrA, 17.14% for sul1, and 20% for sul2. E. coli is a mesophilic bacteria and is not naturally present in fish. Fishes have mostly psychrophilic bacteria in their microflora. The origin of E. coli on the skin of fish is water contaminated with human and animal feces, so the antibiotic resistance of this bacterium has an indirect relationship with aquaculture. Our study showed that E. coli isolates from the skin of rainbow trout has a high level of antibiotic resistance, which may be a risk to public health. Therefore, it is very important to control the use of antibiotics in fish farming to reduce the selection pressure to emergence and spread of antibiotic-resistant bacteria.

Genetic fingerprinting of Escherichia coli strains in one habitat can significantly help our understanding of genetic diversity and circulation in different hosts. In this study, 48 stool samples were collected from 24 healthy zoo animal species in Kerman zoo by sterile swab. After the isolation of Escherichia coli, the strains were genetically fingerprinted by the ERIC-PCR method, and the bond patterns obtained from electrophoresis were calibrated and analyzed with Gel Quest software. In the next step, the similarity of ERIC templates was determined by drawing a phylogenetic tree by Cluster Viz software using the UPGMA algorithm. In this method, 22 clones were identified with a ≥95% similarity cutoff; The ERIC pattern of pigeon isolates had 100% similarity with a peacock isolate, and the ERIC pattern of ostrich isolates had 100% similarity with one peacock isolate. The isolates of horned chicken, casco, and one isolate of the tawny owl were grouped together with 100% similarity in terms of ERIC pattern. Also, camel isolates and one isolate from a tawny owl showed 100% similarity in the ERIC pattern. Considering that several strains isolated from different hosts with different species had 100% similarity in the ERIC pattern, it can be concluded that due to the proximity of different animal species in the same habitat such as a zoo, these strains circulated among different animals.

Colicins are antibacterial compounds produced by Escherichia coli which give the producing strains the ability to compete ecologically against other bacteria. The aim of this study was to identify Escherichia coli strains producing colicin isolated from broiler carcasses by PCR and to investigate the inhibitory effect of colicinogenic strains on different Escherichia coli pathotypes. In this study, swab sample was obtained from 110 carcasses of broiler carcasses slaughtered in Kerman industrial slaughterhouse. one confirmed Escherichia coli isolate was selected from each carcass. Seven groups of colicin genes including Y.U, E1, V, 5.10.K, E2-9, Ia.Ib and A.N.S4 were screened using PCR and specific primers. Strains containing at least one colicin encoding gene were studied for their inhibitory effect on the growth of various Escherichia coli pathotypes. In this study, out of 110 isolates, 54 isolates (49.1%) were positive for at least one of the studied genes. Of the total samples, 33 isolates (30%) were positive for Ia.Ib gene. Also, V and E1 genes with frequencies of 20% (22 isolates) and 9% (10 isolates) were in the next ranks, respectively. The prevalence of A.N.S4 gene was 2.9% (3 isolates) and E2-9 and 5.10.K genes were only detected in 1 isolate (0.9%). The U.Y gene group was not detected in this study. Among 54 isolates with colicin genes, 18 isolates (33.3%) had an inhibitory effect on at least one of the ETEC, EIEC, EHEC, EAEC and EPEC patotypes. Phenotypically, the most inhibitory effect of colicinogenic strains was observed on ETEC and EAEC pathotypes.

The dogs' relationship with their owners has made them one of the most popular pets. They can be a reservoir of many microbial pathogens, so they are important for public health. This study was performed to determine the phylogenetic backgrounds and antimicrobial resistance of E. coli isolates from healthy household dogs and their owners in Kerman province, Iran. Samples were taken regardless of antibiotic usage in the dogs. Based on the history of the animals, 90% of them had not used antibiotics during the few months before the study. 168 E. coli strains belonging to feces of healthy household dogs (n=49), their owners (n=49) and the people without a pet (n=70) were studied; phylogenetic sequences including chuA, yjaA and TspE4.C2 were screened by conventional polymerase chain reaction (PCR). The isolates were investigated phenotypically for antimicrobial resistance against 11 commonly used antibiotics in dogs which were erythromycin, streptomycin, enrofloxacin, oxytetracycline, cefotaxime, ampicillin, trimethoprim-sulfamethoxazole, amoxicillin-clavulanic acid, ceftazidime, ceftriaxone and kanamycin. E. coli isolates were classified into A, D, B1 and B2 phylogroups with the prevalence of 55.9%, 30.3%, 7.1% and 5.3%, respectively. Considerably, antimicrobial resistance to erythromycin and oxytetracycline were predominant while the lowest frequency of antibiotic resistance was detected against ceftriaxone, ceftazidime, amoxicillin-clavulanic acid and kanamycin. This study was performed on apparently healthy dogs so it could determine their carrier role for antibiotic-resistant E. coli strains. This research revealed that healthy household dogs should be considered as the significant reservoir of resistant E. coli isolates especially to erythromycin, oxytetracycline, streptomycin, enrofloxacin, cefotaxime and ampicillin which these resistant strains were mostly belonging to A and D phylogenetic groups.

The aim of this study was to the determination of prevalence of resistant Escherichia coli isolates to commonly used β-lactam antibiotics and some related resistance genes in sheep. Totally, 67 E. coli isolates from 67 healthy sheep were considered to determine resistance against 9 antibiotics belonging to commonly used beta-lactam antibiotics by disc diffusion method. Also, the presence of blaTEM, blaSHV and blaCTX-M genes was investigated by PCR. The results showed all isolates were resistant to at least one of the tested antibiotics. The high prevalence of resistant strains to cephalexin, cefotaxime and ceftazidime was 98.5%, 98.5% and 97%, respectively. Also, 5 samples (7.4%) were positive for ESBLs producing E. coli. The results of this study indicated an increasing rate of resistance to commonly used β-lactam antibiotics among sheep. Therefore, antibiotic prescription methods should be limited and prevention strategies should be considered against infections to avoid dissemination of antibiotic resistance in food-producing animals.

Intestinal pathotypes of Escherichia coli belong to the companion animals may poses potential risk to public health following zoonotic transmission. Therefore, this study was proposed to determine the virulence genes associated to diarrheagenic E. coli strains isolated from healthy pet dogs and their owners in the southeast of Iran, Kerman province.

Totally 168 E. coli isolates were collected from 49 healthy household dogs and their owners. Seventy isolates were obtained from non-pet owners as control group. Presence or absence of the virulence genes including eae, stx1, stx2, st1, lt1, ipaH, cnf1 and cnf2 were screened by conventional polymerase chain reaction (PCR) and dissemination pattern of the genes were studied among the various hosts.

PCR examinations showed that the most frequent virulence gene was ipaH (6.1%) in dogs followed by eae in dog owners (6.1%) and in controls (8.6%). The most frequent pathotypes in dogs, their owners and controls were EIEC (6.1%), EHEC (4.08%) and EPEC (8.5%), respectively. In one of studied houses, both of dog and its owner harbored E. coli strains with same virulence profile (stx1/eae) and pathotype (EHEC).

These results collectively indicate that healthy household dogs probably are the mild reservoir of potential virulent E. coli strains with possible active transmission to their contact owner. However, even non-pet owners seemed to be a notable source of intestinal pathotypes, especially EPEC, for their environment. Transmission of E. coli pathotypes may occurs by direct contact with the reservoirs or ingestion of contaminated food. These pathotypes are potentially virulent and creates public health hazards. Further studies are needed for better understanding of dissemination mechanisms of E. coli pathotypes among humans and their pets.

Escherichia coli infections in poultry have a word wide spread. Serotypies O1, O2, O8, O35, O78 Escherichia coli is involved in the development of generalized colibacillosis disease. Genes such as F17, Sfa, pap, afa, , fimH , crl , iuc, bla, yja, chu, are considered as an Escherichia coli acuity factoro. the aim of the present study were Phylogentic of Escherichia coli isolates involved in Colibacillosis and cellucitis in broiler chickens in shahrebabak(Kerman Province) by Multiplex PCR Technique 

From 117 samples of Escherichia coli (83 colibacillosis samples and 34 cellulitis samples) were isolated. These samples were examined and confirmed by biochemical methods.

Colibacillosis isolates were belonged to A (54.27%), B1 (7.22%), B2 (6.03%) and D (32.53%) phylogroups. Where as, the isolates from cellulitis cases were belonged to three main phylogroups; A (55.88%), B1 (5.88%) and D (38.24%).

Statistical analysis showed a specific association between the presence of crl virulence gene and Phylogrups of A and D (P<0.05) in colibacillosis isolates.
The results showed that the isolates from both diseases in broiler chickens could be assigned to various phylogenetic groups (mainly A). Also, the virulence genes profile of cellulitis E.coli is completely different from that of colibacillosis in this region

Urinary tract infection (UTI) is one of the most commonly encountered diseases in clinical settings and uropathogenic Escherichia coli (UPEC) is the major causative pathogen of UTI. The increase of antibiotic resistance among isolates of E. coli has become a main concern worldwide. The purposes of this study were to determine the phylogenetic background, prevalence and characterize of extended-spectrum β-lactamases and metallo-β-Lactamase produced by E. coli from UTIs.

Two hundred and sixteen E. coli isolates were isolated from UTI. The isolates were screened to determine the phylogenetic background and prevalence of CTX-M-15, PER, VEB, IMP and VIM genes by PCR. The antimicrobial susceptibility of isolates was determined by disk diffusion and broth micro-dilution methods. The isolates were screened using a double-disc synergy test.

Phylotyping of isolates revealed that isolates segregated in phylo-groups A (40.74%), B1 (7.87%), B2 (18.05%) and D (33.34%). By disk diffusion test 61.57% of isolates were resistant to cefotaxime, 35.64% to ceftazidime, 26.38% to aztreonam, 16.66% to cefepime and 6.48% to imipenem. Among the studied ESBL isolates, 72.41% isolates were positive for the CTX-M-15 gene. None of the isolates were positive for IMP, VIM, PER and VEB genes.

The ESBL-producing strains were associated with shifts in phylogenetic distribution toward none-B2 phylo-groups and they mainly belonged to A and D groups.

Diarrheagenic Escherichia coli (DEC) is a common enteric pathogen that causes a wide spectrum of gastrointestinal infections, particularly in developing countries. This is a systematic review and meta‑analysis to determine the prevalence of DEC in various geographical regions in Iran. English (PubMed, Web of Science, Scopus, Embase, Cochrane Library, and Google Scholar) and Persian (IranMedex, SID, Magiran, and Iran Doc) databases were comprehensively searched from January 1990 to April 2017. Study selection and data extraction were performed by two independent reviewers. After assessing heterogeneity among studies, a random effects model was applied to estimate pooled prevalence. Data analyses were done with the Stata software (version 12.0). This meta‑analysis was registered with PROSPERO, number CRD42017070411. A total of 73 studies with 18068 isolates were eligible for inclusion within the meta‑analysis. The results of random effects model showed that the most prevalent DEC pathotypes were enterotoxigenic E. coli (ETEC) (16%; 95% confidence interval [CI]: 11%–23%), enteroaggregative E. coli (11%; 95% CI: 8%–15%), atypical enteropathogenic E. coli (EPEC) (11%; 95% CI: 8%–14%), Shiga toxin‑producing E. coli (9%; 95% CI: 6%–13%), diffuse adherent E. coli (6%; 95% CI: 6%–12%), enteroinvasive E. coli (4%; 95% CI: 2%–6%), and typical EPEC (3%; 95% CI: 1%–5%). This study showed that DEC infections in the Iranian population have low frequency. Our data suggest that the ETEC pathotype can be regarded as one of the most important etiological agents of diarrhea in this country. However, the prevalence of DEC pathotypes is diverse in different regions of Iran.

Avian pathogenic Escherichia coli (APEC) are responsible for wide ranges of extra-intestinal diseases in poultry including colibacillosis, cellulitis, coligranuloma and yolk sac infection. Numbers of virulence are considered important in the pathogenicity of these diseases. The aims of the present study were phylogenetic typing and virulence genes detection in Escherichia coli isolates from colibacillosis and cellulitis of broiler chickens in poultry slaughterhouses of Shahrbabak region, Kerman, Iran. A total number of eighty three E. coli isolates were taken from broiler chickens with colibacillosis and thirty four isolates were taken from carcasses with cellulitis in the industrial slaughterhouses. Biochemically confirmed E. coli isolates were subjected to polymerase chain reaction assay to determine phylogenetic groups and presence of pap C, sfa/focDE, iucD, afaIB-C, hlyA, fimH and crl virulence genes. Colibacillosis isolates were belonged to A (54.21%), B1 (7.22%), B2 (6.03%) and D (32.53%) phylogroups. Whereas, the isolates from cellulitis cases were belonged to three main phylogroups; A (55.88%), B1 (5.88%) and D (38.24%). Statistical analysis showed a specific association between the presence of crl virulence gene and phylogroups of A and D in colibacillosis isolates. The results showed that the isolates from both diseases in broiler chickens could be assigned to various phylogenetic groups (mainly A(. Also, the virulence genes profile of cellulitis E. coli is completely different from that of colibacillosis in this region.

Peritonitis, pericarditis and meningitis due to salmonella enterica in a Kermani ewe
CASE HISTIRY : A Kermani ewe was examined because of inappetance and illthrifness.
CLINICAL PRESENTATION : Clinical examination showed normal heart rate , tachy pnea, muffled heart sounds , stiff neck , dullness , dehydration , rumen atony and paled mucosal membrane .
DIAGNOSITIC TESTING : Post mortem examination revealed pericarditis, peritonitis, intestinal adhesion, mesenteric thickness as well as meningeal thicknesses. Salmonella enterica was isolated in bacterial culture from affected tissues .
ASSESSMENTS : Although there are some previous reports regarding the association between salmonella infection and peritonitis, pericarditis and meningitis in domestic animals, to the best of our knowledge, there is no previous report about the concurrent peritonitis, pericarditis and meningitis due to salmonella in ruminant .

A newly emerged hypervirulent strain of Klebsiella pneumoniae has caused great concern globally; however, its molecular characteristics have been rarely reported in Iran.
The goal of this study was to detect the virulence determinants and serotypes of K. pneumoniae and to evaluate the association among selected virulence traits and blaCTX-M-15 gene in southeastern Iran.
One hundred and three non-duplicate K. pneumoniae strains were isolated from clinical samples. The isolates were identified by standard bacteriological tests. Confirmed isolates were examined to detect a selection of virulence genes (wabG, rmpA and iucB) and serotypes (K1, K2, K5 and K20) by PCR. The isolates were studied foe the presence of beta-lactamase (blaCTX-M-15) gene. SPSS software (version 19.0) was used for data analysis.
Among the 103 K. pneumoniae isolates, 61 (59.2%) isolates were positive for wabG, 4 (3.9%) for iucB and 3 (2.9%) for rmpA genes. The presence of K20 in 3.9% (4/103) of the isolates represented the most prevalent. Only 3 (2.9%) isolates possessed the K1 serotype, while K2 and K5 serotypes were not detected in any isolate. The blaCTX-M-15 gene was detected in 47 (45.6%) isolates. blaCTX-M-15-positive isolates showed a higher prevalence of wabG among the studied isolates (P Our data indicate a correlation between presence of virulence gene and blaCTX-M-15 in K. pneumonia isolates. Further research should be undertaken to unravel aspects of both virulence factors and antibiotic resistance which may probably contribute to managing future spread of infectious diseases.

Aim: The present study was conducted to detect the occurrence, serogroups, virulence genes and phylogenetic relationship of shiga toxin-producing Escherichia coli (STEC) in human, clave and goat in Kerman (southeast of Iran).
STEC have emerged as the important foodborne zoonotic pathogens causing human gastrointestinal disease and confirming the risk to public health.
A total of 671 fecal samples were collected from diarrheic patients (n=395) and healthy calves (n=156) and goats (n=120) and screened for the presence of stx gene. Furthermore, the prevalence of stx1 and stx2 variants, serotypes (O157, O145, O103, O26, O111, O91, O128, and O45), phylogenetic groups and the presence of ehxA, eae, hylA, iha and saa virulence genes were studied.
Prevalence of STEC in human diarrheic isolates was 1.3% (5 isolates), in claves was 26.3% (41 isolates) and in goats was 27.5% (33 isolates). stx1 gene was the most prevalent variant and detected in 75 isolates. Furthermore, stx1c was the most predominant stx subtype, found in 56 isolates. The ehxA identified in 36 (45.6%) isolates, followed by iha 5 (6.3%), eaeA 4 (5.1%), hlyA 2 (2.5%) and saa 2 (2.5%). Most of the isolates belonged to phylogroup B1. Only two O26 and one O91 isolates were detected in our study.
Our results show that STEC strains were widespread among healthy domestic animals in the southeast of Iran

Treatment of multi-drug-resistant strains of pneumonia with common antibiotics in renal patients is ineffective and physicians are compelled to use Colistin for such cases.

This study was conducted to assess the mortality, length of stay, and renal damages in the treatment of multi-drugresistant pneumonia with Colistin among multiple trauma patients admitted to the emergency department and transferred to the ICU.

This retrospective cohort study was conducted between 2011 and 2016. 102 multiple trauma (MT) patients with multidrug-resistant strains of hospital-acquired pneumonia (HAP) admitted to the emergency department then transferred to the ICU were assessed. All patients received Colistin according to their weight. Renal damage was evaluated according to the RIFLE criteria. The mortality and the length of stay were assessed. In order to statistically analyze the data, SPSS version 23 software was used to conduct t-test and chi-square test.

Out of 102 patients, 55 (54%) died and 50 (49.1%) developed acute renal failure; 64 cases had no hypertension. Patients according to the RIFLE index were assessed: Risk (11.01%), Injury (14%), Failure (18%), Loss (6%), and End-stage renal disease. The prevalence and prognosis of acute kidney injury in multiple trauma patients treated with Colistin were significantly correlated with drug dosage, body mass index, and use of corticosteroids (when assessed using relevant scoring systems, P < 0.05).

The use of a scoring system in the intensive care unit, determining those patients requiring Colistin, and adjusting the dosage of this drug for treatment of MT patients with multi-drug resistant strains of HAP are vital. Creatinine levels must be carefully monitored.

Antibiotic resistance (AR) is an important challenge in prevention, treatment and control of infectious diseases and is a public health threat for human. Escherichia coli strains are the major causes of urinary tract infections (UTIs).
This research aimed to determine prevalence of resistance to quinolone and fluoroquinolone antibiotics and screen qnr genes among E. coli isolates from UTIs.
A total of 105 E. coli isolates were obtained from UTI cases in Bojnord city (northeast of Iran) and confirmed by biochemical tests. All strains were studied to determine their resistance to 3 antibiotics including ciprofloxacin, nalidixic acid, and levofloxacin via disk diffusion method. Moreover, the frequency of qnrA, qnrB and qnrS genes and phylogroups was studied by conventional Polymerase chain reaction (PCR).
In this study, prevalence of phenotypic AR to ciprofloxacin, nalidixic acid and levofloxacin was 47.6%, 44.8% and 38.1%, respectively. Three isolates were positive for qnrS and 1 isolate was positive for qnrA. Seven phylogenetic groups were also identified as follows: 18% A0, 6.7% A1, 7.6% B1, 1.9% B22, 23.8% B23, 15.3% D1 and 26.7% D2.
Prevalence of qnr genes was very low; thus, other types of qnr and plasmid-mediated quinolone resistance genes were probably responsible for the resistance. Phenotypic AR to the 3 antibiotics was found in approximately half of E. coli strains. It is strongly recommended that antibiogram tests should be done before prescribing the ciprofloxacin, nalidixic acid and levofloxacin for UTIs.

The objectives of this study were to evaluate the antibiotic resistance profiles, biofilm formation, presence of antigen 43 (Ag43) gene, and transfer of antibiotic resistance phenotype among non-O157 Shiga toxin producing Escherichia coli (STEC).
From October 2014 to November 2015 a total of 276 stool samples were collected from healthy calves, goats and 395 patients with the sign of nonbloody diarrhea and screened for presence of stx and serotype O157 genes by polymerase chain reaction (PCR) technique. Susceptibility to 14 antibiotics was determined as per CLSI guideline. Presence of Ag43 and intimin (eaeA) genes were detected by PCR. Biofilm formation was measured by microtiter plate method. Conjugation was carried out by membrane filter technique.
We isolated 74 (93.6%) non-O157 STEC strains from 41 calves, 33 goats and 5 (6.3%) patients’ stools, however, no O157 serotype was detected in our study. Resistance was observed most commonly to tobramycin (66.2%), kanamycin (48.6%), and amikacin (29.7%) and less frequently to ciprofloxacin (4.1%), amoxicillin-clavulanic acid (5.4%), and ceftriaxone (9.5%) in isolates recovered from calves and goats fecal samples, whereas, all human isolates were sensitive to ceftazidime, ciprofloxacin, tobramycin and imipenem, respectively. Furthermore, Ag43 was detected in 60 STEC isolated from animals and 5 human origins (no eaeA gene was found in this study). Biofilm formation from Ag43 and Ag43- colonies showed 20 isolates with strong biofilm activities. Cefotaxime resistance phenotype was transferred to E. coli ATCC 25922.1 (Nalr) by conjugation at a frequency of 1.6×10-4.
From the above results we concluded that, human infections with non-O157 STEC were significantly low in Kerman. Ag43 was insignificant with biofilm quantity in most cases.

The aim of the present study was to determine the prevalence of phylogenetic groups/subgroups, fimbrial genes, and antibiotic susceptibility of E. coli isolated from urinary tract infections in Karaj city, Iran.
A total of 107 E. coli isolates were confirmed by standard bacteriological tests. The phylogenetic group, fimbrial genes and antibiotic resistance genes was determined by PCR method. Antibiotic resistance of all the isolated E.coli against nine antimicrobial agents was determined by disk diffusion method.
PCR assays showed the prevalence of fimbrial genes among the studied isolates were 31.7% and 9.3% for papEF and afaBC, respectively. Most of papEF genes were placed in D phylogroup (18.6%) and D1 subgroup (14.01%) and the percentage of afaBC (2.8%) were similar in B1, B2 and D phylogroups. The frequency of tetA and tetB genes were 22.4% and 17.7%. Isolates which contained tetA were distributed mainly in D group (14.01%) and those which contained tetB were divided in D group (7.48%). Antimicrobial susceptibility testing showed the maximum resistance rate to cephalexin (CN: 100%) and the minimum resistance level to ciprofloxacin (CP: 36.5%).
The present study showed that phylogenetic groups A and D were predominant. Virulence factors such as papEF and afaBC belonged to D phylogenetic group. Multidrug resistance E. coli isolates tends to be in the non-B2 phylogenetic groups. Due to high antibiotic resistance, appropriate control should be considered in medicine to control the development of novel resistant isolates.

Colibacillosis caused by avian pathogenic Escherichia coli (APEC) is an economic threat to the poultry industry throughout the world. Some of the virulence genes may enhance the ability of E. coli isolates to grow in the tissues of broilers. The APEC strains are assigned to a few distinct phylogenetic groups. The purpose of the present study was to detect the virulence genes and phylogenetic groups of E. coli isolates from colibacillosis cases in Japanese quail in 2014 in Kerman, Iran. In the present study, one hundred and two E. coli isolates were obtained from dead Japanese quails with colibacillosis. E. coli isolates were confirmed by standard biochemical and bacteriological methods. DNA of E. coli isolates was extracted by boiling method. The confirmed E. coli isolates were investigated to detect the phylogenetic groups and virulence genes including sfa/focDE, afaIBC, papEF by PCR methods. E. coli isolates were classified into A (62 isolates), B1 (24 isolates), B2 (12 isolates) and D (four isolates) phylogenetic groups. Among examined isolates nine isolates (8.82%) were positive for papE-F, five isolates (4.90%) for afaIB-C and two isolates (1.96%) for sfa/focD-E genes. Based on our findings, E. coli isolates from colibacillosis of Japanese quail could be assigned to various phylogenetic groups (mostly A and D), and they may contain the adhesion genes in a low prevalence.

Antimicrobial resistance is one of the main challenges in diarrheal diseases in human and animals. Regardless to the main reason of the disease, approximately all antimicrobial actions including treatment, control and prevention are mostly centralized against Escherichia coli (E. coli) strains.
This work purposed to antimicrobial resistance (AR) and determinate virulence genes and phylogenetic groups in E. coli isolates (n=170) obtained from calves with diarrhea.
Isolates were molecular characterized for 17 AR genes and 3 phylogenetic sequences. AR phenotyping were performed on all strains for 12 antimicrobial agents by using disc diffusion method.
All AR genes but qnrS were identified with different prevalence in E. coli isolates that the most common genes were aadA (20%), blaTEM (11.7%) and sulII (11.2 %) belonging to aminoglycoside, β-lactamase and sulphonamide families, respectively. Resistance to the penicillin and sulphamethoxazole drugs was found in 100% of isolates and followed by tetracycline (73.5%), streptomycin (60%), trimethoprim sulphamethoxazole (56.5%) and kanamycin (53.5%). The phylogenetic groups A and B1 considerably surrounded the majority of isolates with the frequency of 65.8% and 30.6%, respectively.
In Iran, diarrheic calves have an important role as reservoir of resistant E. coli strains against the some drugs which are registered for treatment of calf diarrhea.

The aim of this study was to determine antibiotic resistance genes, phylogenetic groups and anti-microbial resistance patterns of Escherichia coli isolates from fecal samples of healthy pet cats in Kerman city. Ninety E. coli isolates were recovered from obtained rectal swabs. Antibiotic resistance pattern of the isolates against seven selected antibiotic was determined using disc diffusion method. Phylogenetic background of the isolates was determined according to the presence of the chuA, yjaA and TspE4C2 markers. Theisolates were examined to determine a selection of antibiotic resistance genes including tetA, tetB, aadA, sulI and dhfrV by polymerase chain reaction. Forty two isolates (46.6%) were positive at least for one of the examined genes. Phylotyping revealed that the isolates are segregated in phylogenetic groups A (66.7%), B1 (1.2%), B2 (13.4%) and D (18.9%). Among 90 isolates, 26.6% were positive for tetB gene, 10.0% for cqnrS gene, 12.3% for sulI and aadA genes, 8.9% for tetA and 2.2% for dhfrVgene. None of the E. coli isolates were positive for qnrA and qnrB genes. Sixteen combination patterns of antibiotic resistance genes were identified which belonged to four phylogroups. Maximum and minimum resistant isolates were recorded against to tetracycline (82.3%) and gentamycin (1.2%), respectively. Fifteen antibiotic resistance patterns were determined in different phylo-genetic groups. In conclusion, feces of healthy pet cat in Kerman could be a source of antibiotic resistant E. coli isolates, whereas these isolates were distributed all over the main phylogroups.

Flood frequency analysis can be considered as one of important methods of flood estimation, forecasting and management in river basins. Structural river engineering and flood control practices are major convenient flood mitigation approaches, whereas, flood frequency analysis is the first steps to achieve this purposes. In this paper maximum and partial duration series as two convenient flood frequency analysis methods were applied in some hydrometric stations in Talar and Babolrud basin in Mazandaran province, regarding to the lack of the recorded flood data series or missing data in hydrometric stations and necessitate of application of more accurate methods. This research has shown that the results of maximum and partial duration series are very sensitive to the length of the data series, which is depends on the existing of the extreme flood values in observation series. It can be concluded that application of partial duration series can have reasonable estimation in the case of not suitable and short period of data series, in comparison with application of maximum series with an enough data series period. This result can show the capability and importance of partial duration series for flood frequency analysis in hydrometric station with short duration data series.

This study was conducted to reveal the phylogenetic background, to detect the genes encoding TEM, SHV and CTX-M-15 extended-spectrum β-lactamases (ESBL), and to analyze their distribution in phylo-groups of 150 Escherichia coli isolates from broiler chickens in Ahvaz (Southwest of Iran). Seventy- five cloacal swabs from healthy birds (fecal isolates), and 75 heart blood samples from birds with colibacillosis (septicemic isolates) were obtained. All isolates were phylotyped and screened for ESBL genes by polymerase chain reaction (PCR). The fecal isolates belonged to four main phylo-groups, including 41 isolates (54.67%) to A, 9 (12.00%) to B1, 5 (6.67%) to B2, and 20 (26.67%) to D. Of septicemic isolates, 37 isolates (49.33%) were classified as phylotype A, 5 (6.67%) as B1, 10 (13.33%) as B2, and 23 (30.67%) as D. In molecular analysis, a total of 72 isolates (35 fecal and 37 septicemic) were identified to harbor ESBL genes, which were distributed in phylo-groups A, B1, B2, and D. Regardless of the type of isolate, blaCTX-M-15 gene was the most common genotype, followed by blaTEM and blaSHV genes. This study suggests that broiler chickens in Iran are infected to ESBL genes- harboring Escherichia coli strains which may be spread to the food chain through fecal contamination of carcasses during slaughtering.

Diarrheagenic Escherichia coli (DEC) strains are a major cause of intestinal syndromes in the developing countries. The aim of this study was to determine the prevalence of enterotoxigenic E. coli (ETEC) and enteroinvasive E. coli (EIEC) in relation to phylogenetic background from patients with diarrhea.
A total of 110 E. coli isolates were obtained from diarrhea patients in Sirjan, southeast of Iran. The E. coli isolates were confirmed using biochemical and bacteriological tests. DNA of E. coli isolates was extracted by boiling method and checked for existence of ETEC (LT and ST genes) and EIEC (ipaH gene) pathotypes and also characterize the phylogenetic groups on the basis of presence or absence of the chuA, yjaA genes and an anonymous DNA fragment, TspE4. C2 by multiplex PCR.
Out of 110 E. coli isolates, 32 (29.09%) were positive for ETEC (LT and ST genes) and 6 (5.45%) possessed EIEC (ipaH gene) pathotypes. Isolates fall into four phylogenetic groups: A (39.09%), B1 (20%), B2 (15.45%) and D (25.45%). Phylotyping of isolates of DEC indicated they were distributed in four phylogenetic groups including A (12 isolates), B1 (7), B2 (9) and D (10).
In this study, the DEC isolates were segregated into different phylogenetic groups. The majority of isolates belonged to phylo-groups A and D.

Although Escherichia coli (E. coli) is a part of intestinal normal microflora of warm-blooded animals, including poultry, outbreaks occur in poultry raised below standard sanitation and during the course of respiratory or immunosuppressive diseases. Avian pathogenic E. coli (APEC) harbors several genes associated with virulence and pathogenicity. APEC strains are responsible for some diseases in poultry including colibacillosis, swollen head syndrome, yolk sac infection, omphalitis and coli granuloma.
The aim of this study was examination of the presence and frequency of three important virulence genes in intestinal and extra-intestinal (liver) E. coli isolates from chicken of Khuzestan province in the southwest of Iran.
Totally 120 (60 intestinal and 60 liver) E. coli isolates were examined by polymerase chain reaction (PCR) for the presence of aerobactin (iutA), temperature sensitive hemagglutinin (tsh) and fimbriae type 1 (fimH ) genes.
The results showed that tsh, iutA and fimH are respectively present in 78.3%, 70% and 61.7% of liver isolates while in intestinal ones the frequency of these genes was 21.7%, 41.7% and 41.7% respectively. The most prevalent genotypes in extra intestinal and intestinal isolates were tsh縩蟺⮭ and tsh-fimH-iutA-respectively.
It seems that these sets of virulence genes are significantly more prevalent (P