فهرست مطالب hadi safdari

Green synthesis as a new method of synthesis of nanoparticles with a simple, biocompatible, safe, and economical approach can be an alternative to chemical and physical processes. Fungi can convert some toxic ions into less harmful forms, including nanoparticles. Nanoparticles with a size of 1 to 100 nanometers have unique quantum properties. Today, the problems of drug resistance have been seen in different species of fungi. Selenium nanoparticles (SeNPs) are substances that have been reported to have antifungal properties. The present study aimed to investigate the antifungal effect of biosynthesized SeNPs using Aspergillus fumigatus.

For this purpose, SeNPs were biosynthesized with a specific concentration using A. fumigatus. The presence of nanoparticles was confirmed by various methods, including UV-Vis, FT-IR, FE-SEM, EDX, XRD, DLS, and Zeta potential. Then, susceptibility determination based on the Minimum Inhibitory Concentration (MIC) testwas performed on standard fungal strains treated with SeNPs.

After confirming the results of nanoparticle biosynthesis, the MICs for Itraconazole and Amphotericin B against the standard fungal strains were 8 and 4 μg/mL respectively. In comparison, MIC values for SeNPs-treated samples were reduced to 1 μg/mL and below.

Due to the increasing resistance of opportunistic fungi to target antifungal drugs, the use of biosafety SeNPs even at low concentrations can have favorable inhibitory effects on the growth of fungal pathogens

 Many nosocomial infections, which cause death and cost society, may be transmitted through healthcare workers’ contacts. Preventive health measures greatly reduce their prevalence.

 This study aimed to investigate the microbial contamination of healthcare workers’ hands in different wards of Sheikh Hospital. In addition, the alcohol-based hand sanitizers’ ability to reduce microbial load of nosocomial infections was evaluated.

 The present study was performed in spring 2019. Thirty-two nurses’ hand samples were obtained from different wards of the hospital, including emergency, ICU, surgery, peritoneal dialysis, nephrology, and hematology-oncology. Biochemical tests determined the isolates. Participants’ hands were cleaned using a standard procedure using soap and 70% isopropyl alcohol-based hand sanitizer.

 Different species, including coagulase-negative Staphylococcus (CoNS), Klebsiella pneumoniae, Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Bacillus, Klebsiella oxytoca, Acinetobacter baumannii, Stenotrophomonas maltophilia, and Burkholderia cepacia complex were isolated. Following hand hygiene procedure, the most effective decontamination for a wide variety of organisms was observed.

 Separation of dangerous pathogenic bacteria such as S. aureus, K. pneumoniae, and E. coli from healthcare workers may be a great warning sign for these infections in the hospital. Therefore, hand hygiene procedures may be considered an appropriate method to decrease nosocomial infections.

Staphylococcus aureus is a Gram-positive cocci which is one of the main infection causes. 20-30% of healthy people carry staphylococcus in their nasal cavities. Staphylococci resistant to beta-lactam is called MRSA. Regarding the presence of MRSA in the therapeutic environment. The sample was taken by swapping from nose secretion of emergency department staff at Ghaem Hospital. This study aims staphylococcus resistant to antibiotics. In this study, 100 emergency medical personnel of Ghaem Hospital in Mashhad were sampled from nasal secretions from Farvrdin to Aban 1397. Samples were taken by two sterile wet swabs from nasal secretions and by chemical test, staph coccus was detected and antibiotic susceptibility test was done by Kirby Bayer method. From a total of 100 employees in emergency departments of Ghaem Hospital, 68 samples revealed Staphylococcus aureus (68%), while 21 samples of Staphylococcus aureus were found to be beta-lactamase positive. Resistance to antibiotics was observed, 100% of samples were resistant to penicillin and the highest sensitivity to cefotaxime was 100%. It was notable that one sample was resistant to vancomycin (3.5%). If an employee has MRSA in nose secretion, they shouldn’t have direct contact with patients. More caution is needed in hospital occupations.

Chlamydia trachomatis and Mycoplasma genitalium are of the main causes of womens' genital tract worldwide. These two bacteries cause urethritis, cervicitis, and pelvic inflammatory disease, which can lead to infertility in women. This study was performed with aim to determine the prevalence of these two infections in infertile women and its effect in IVF treatment failure. 

In this study, cervical swab sampling was performed from 100 infertile patients referred to infertility treatment center of Razavi hospital and Milad infertility center in Mashhad. The swabs were then immediately placed in a Screw Cap Test Tubes containing thioglycollate medium  and transferred to the laboratory.
The incubation was performed at 37C for 18 hours and then the tubes were centrifuged. The resulting precipitate was transferred into the microtubule, and after 3 washes, DNA extraction was performed by boiling. Finally, the supernatant was used for PCR (Uniplex PCR) separately with specific primers for each of these bacteria

The results showed that 23 samples were positive for Chlamydia trachomatis and most cases of IVF failure were related to this group (17 cases). Only one specimen was positive for Mycoplasma genitalium which was related to a patient with IVF failure.

Considering the prevalence of Chlamydia trachomatis and and Mycoplasma genitalium, screening is impotrant in infertile women who suffer from relatively severe conditions and high costs of infertility treatment, including IVF. So, it is suggested that before any infertility treatment, the patients be monitored for the presence of these bacteries and receive antibiotic treatment if the result was positive.

  Acinetobacter baumannii is one of the primary causes of nosocomial infections. Furthermore, the increment of antibiotic resistance has raised concerns about the proper therapeutic approach to this problem. This study aimed to determine the susceptibility of A.baumannii to colistin and imipenem through minimal inhibitory concentration (MIC). In this study, 2745 samples (2745 plate) were collected from patients in different wards of Ghaem Hospital and Imam Reza Hospital in Mashhad between October 2015 and September 2016. In the case of a specimen was wound, after disinfection of the wound surface using a sterile swab from the inferior part of the sample, middle stream urine was collected in sterile container, and the bronchial specimen was taken by the doctor by syringe. In this study, 100 A.baumannii were isolated from 100 hospitalized patients at Imam Reza and Ghaem hospitals of Mashhad, By Biochemical tests (Kligler iron agar, Lysine, urea indole) diagnostic and then disc diffusion method, and E-test strips were utilized to evaluate infection, antibiotic susceptibility, and MIC, respectively.
. The obtained results of disc diffusion showed that all isolates were resistant to imipenem, which was also confirmed by E-test strips. Moreover, all isolates were sensitive to colistin. The obtained colistin MIC was 0.25μg/ml for one sample and ≤2μg/ml for others; which were considered sensitive according to the Clinical and Laboratory Standards Institute standards. The high resistance of A.baumannii to imipenem was indicative of resistance pattern changes of this bacteria and insufficiency of the mentioned antibiotic for treatment. However, colistin is still effective and should be prescribed more carefully to prevent resistant strains spread.

As one of the major causes of hospital and community acquired infections, Methicillin-resistant Staphylococcus aureus (MRSA) requires accurate and timely diagnosis. This study aimed to investigate the prevalence and antibiotic resistance patterns of MRSA in patients hospitalized in the Birjand-based Imam Reza hospital.
In this cross-sectional study, a total of 102 clinical Staphylococcus aureus isolates were evaluated. Staphylococcus aureus isolates were confirmed via conventional microbiological and PCR methods (coa gene). The antimicrobial resistance patterns of the isolates were determined using the Kirby-Bauer disk-diffusion based on CLSI guidelines. Resistance to methicillin in the isolates was confirmed by means of PCR method (mceA gene). Finally, the obtained data was analyzed using SPSS software (version 16).
In this study, 50.9% and 58.8% of Staphylococcus aureus isolates were reported as methicillin-resistant using the Kirby-Bauer disk-diffusion and PCR methods, respectively. The highest antibiotic resistance in MRSA strains was found to penicillin (96.6%), to erythromycin (45%), and to ciprofloxacin (36.6%). In present study, resistance to azithromycin, erythromycin, ciprofloxacin, gentamicin, minocycline, and rifampin in MRSA isolates was significantly greater than Methicillin-sensitive Staphylococcus aureus (P A significant percentage of MRSA isolates in the hospitalized patients was resistant to methicillin, which is confirmed even with a wider range in their genotype.

Pathogenic mycobacteria are one of major causes of human morbidity and mortality. Mycobacterium tuberculosis (M. tuberculosis) is an etiological agent of human tuberculosis. Designing new vaccines including DNA vaccines may be considered as new approaches for preventing of TB.
M. tuberculosis H37Rv was grown on Lowenstein Jensen medium for 4 weeks at 37ºC and then DNA was extracted. The cfp10 gene was amplified by PCR. After digesting the PCR product and the plasmid, cfp10 fragment was ligated into the vector using T4 DNA ligase. Then, Ag85A was subcloned into pcDNA/cfp10. Escherichia coli strain JM109 bacteria were transformed by the desired construct. Clone confirmations were performed by colony PCR, restriction enzyme digestion and DNA sequencing. Recombinant vector was transfected into HeLa cells and total RNA was extracted, then cDNA was synthesized using oligo-dT. Finally PCR was performed by cfp10 primers.
The cfp10 was amplified by PCR method and the PCR products were visualized by agarose gel electrophoresis. The cfp10 fragments showed 303 bp in length. The cfp10 cloned into pcDNA. Then, Ag85Awas ligated into pcDNA/cfp10 after digestion correctly. Colony-PCR and restriction enzyme digestion and sequencing confirmed the cloning the fusion Ag85A/cfp10 fragment. Finally, after cDNA synthesis, expression of vector was confirmed in eukaryotic system.
Cloning of Ag85A/cfp10 genes of M. tuberculosis were performed correctly. It can use as a DNA vaccine for investigation the immune responses in animal models in future studies.

appropriate policies to prevent and control these infections، at first، the epidemiology of this infection should be determined in various populations، therefore، this study was performed with aim to evaluate the prevalence of Chlamydia trachomatis according to different variables in the city of Mashhad. This basic-applied study was performed on 92 women referred to the maternity clinics. In this study، after completing the questionnaire، cervical samples of 70 patients were evaluated by cell culture and PCR methods. Analysis of data was performed by SPSS statistical software (version 16). Among 70 patients evaluated by cell culture method، 6 patients (8. 6%) were positive and by PCR molecular methods، 7 patients (10%) were positive. The most common symptom in positive patients was vaginal discharge. Chlamydia prevalence in the city of Mashhad is significantly high and it is necessary to screen and treat it. Therefore، tests for detection of Chlamydia in genitourinary infections should be considered as one of the routine tests for evaluation of genital infections.

Brucellosis still remains a major health problem with different symptoms and various diagnostic methods. Diagnostic methods of brucellosis are usually based on detecting specific antibodies in the patient’s serum. Nowadays, many serological tests are applied for the diagnosis of human brucellosis. Most routine tests are serum agglutination tests based on Wright and 2-Mercaptoethanol (2-ME).. The aim of this study (cross sectional study) was to evaluate the prevalence of brucellosis and assess the degree of agreement among serum samples of suspected brucellosis serological tests routinely performed in Mashhad, Iran..Patients and This study was conducted in Mashhad from August 2011 to September 2012. Sera (2 - 3 mL) were collected from 83 cases suspected of brucellosis among 594 patients. Ten serum samples were collected from healthy subjects as control sera. Rose Bengal test for initial screening and Wright and 2 ME as standard tests were conducted to determine antibody titers. Thereafter, IgG and IgM levels were determined by the Enzyme Linked Immunosorbent Assay (ELISA) method.. Among 83 serum samples, Rose Bengal test was able to identify 20 (12%) positive specimens; the standard tube agglutination test was able to detect 30 (18%) positive samples, and the ELISA IgG and ELISA IgM were able to trace 42 (21%) and 13 (6.5%) positive samples, respectively. Ten control samples had negative results for the ELISA method. The results were calculated by the Kappa formula. The highest level of agreement was among 1 = KRB-SAT tests and the lowest level of agreement was among tests K ELISA IgM-IgG = 0.30.. According to the results, brucellosis has remained endemic in this region. Most cases were detected by ELISA IgG. The highest kappa agreements were between tests KRB-SAT, KRB-IgG and KSAT-IgG, while the lowest levels of agreement were between tests SAT-IgM and ELISA IgM-IgG. Considering that ELISA IgM results are covered by SAT and ELISA IgG test results, applications of this test do not seem necessary..

Staphylococcus aureus is a major human pathogen. Due to high prevalence of S. aureus infections and increasing resistance to antibiotics, physicians have been facing problems in choosing the appropriate empirical antibiotic therapy for such infections.. The aim of this study was to determine the pattern of antibiotic resistance in S. aureus clinical isolates of Mashhad Quaem Hospital between 2009 and 2011.. In this study 170 isolates of Staphylococcus aureus were identified in laboratory. The specimens (including 82 urine, 43 wound, 37blood, 8 stool samples) were collected and examined by standard diagnostic methods. Determination of S. aureus sensitivity to antibiotics was performed using standard disc diffusion method. The antibiotic sensitivity of bacteria were reported according to the clinical laboratory standards institute (CLSI) manual as sensitive (S), intermediate (I) and resistant (R).. Among tested antibiotics, Staphylococci isolates were highly resistant against Ceftazidime (94%), followed by Penicillin (91%), Ampicillin (82%), Cefotaxime (65%), Erythromycin (60%), and Oxacillin (43%). Nearly all strains were susceptible to tested Vancomycin.. Our results are similar to the reports from other parts of Iran. According to this study, resistance pattern among Staphylococcus aureus strains were widespread in Quaem hospital. The implication of this high resistance is that Staphylococcus aureus infections should be treated more consciously and not with Penicillin and other ineffective antibiotics..

Staphylococcus aureus is a major human pathogen. Due to high prevalence of S. aureus infections and increasing resistance to antibiotics, physicians have been facing problems in choosing appropriate empirical antibiotic therapy. The aim of this study was to determine the pattern of antibiotic resistance among S. aureus clinical isolates in Quaem university hospital between 2009 and 2011. Method and Material: In this study 100 isolates of Staphylococcus aureus were identified in laboratory from different specimens. The specimens were collected and examined by standard diagnostic methods. Determination of S. aureus sensitivity to antibiotics was performed using standard disc diffusion method. The antibiotic sensitivity of bacteria were reported according to the Clinical Laboratory Standards Institute (CLSI) manual with sensitive (S), intermediate (I) and resistant (R). Among antibiotics tested, Staphylococci isolates were highly resistant against penicillin 97%, followed by, oxacillin 63% erythromycin 57%, Cephalexin 43% Klyndamasyn 33 % vancomycin.20%. Our results are similar to reports from many other parts of Iran. According to this study, resistance pattern among Staphylococcus aureus strains were widespread in Quaem hospital. The implication of this high resistance is that Staphylococcus aureus infections should be treated with more precaution and not with penicillin and other ineffective antibiotics.