scholarly journals Cantilever Sensors for Rapid Optical Antimicrobial Sensitivity Testing

2019 ◽  
Author(s):  
Isabel Bennett ◽  
Alice Pyne ◽  
Rachel McKendry
Keyword(s):  
Antibiotic Resistance ◽  
Antibiotic Sensitivity ◽  
Bacterial Cells ◽  
Sensitivity Testing ◽  
Cantilever Sensors ◽  
Antimicrobial Sensitivity ◽  
Key Species ◽  
Bacterial Immobilization ◽  
Global Threat ◽  
Tract Infections

AbstractGrowing antimicrobial resistance (AMR) is a serious global threat to human health. Current methods to detect resistance include phenotypic antibiotic sensitivity testing (AST) which measures bacterial growth and is therefore hampered by slow time to result (~12-24 hours). Therefore new rapid phenotypic methods for AST are urgently needed. Nanomechanical cantilever sensors have recently shown promise for rapid AST but challenges of bacterial immobilization can lead to variable results. Herein a novel cantilever-based method is described for detecting phenotypic antibiotic resistance within ~45 minutes, capable of detecting single bacteria. This method does not require complex, variable bacterial immobilization, and instead uses the laser and detector system to detect single bacterial cells in media as they pass through the laser focus. This provides a simple read out of bacterial antibiotic resistance by detecting growth (resistant) or death (sensitive), much faster than current methods. The potential of this technique demonstrated by determining resistance in both lab and clinical strains of E. coli, a key species for clinically burdensome urinary tract infections. This work provides the basis for a simple and fast diagnostic tool to detect antibiotic resistance in bacteria, reducing the health and economic burdens of AMR.

scholarly journals EMERGENCE AND ANTIBIOTIC SENSITIVITY PATTERN OF ACINETOBACTER BAUMANNII IN HOSPITAL FACILITY

2017 ◽  
Vol 10 (3) ◽  
pp. 77
Author(s):  
Anania Arjuna ◽  
Dinobandhu Nandi
Keyword(s):  
Acinetobacter Baumannii ◽  
Nosocomial Infections ◽  
Antibiotic Sensitivity ◽  
Hospital Environment ◽  
Sensitivity Testing ◽  
Hospital Acquired Infection ◽  
Clinical Specimens ◽  
Sensitivity Pattern ◽  
Tract Infections ◽  
Hospital Acquired

ABSTRACTObjective: Nosocomial infections or Hospital acquired infection (HAI) are one of the major threats to hospitalized patients as well as for the hospitalassociated personnel. In last few years there is a gross change in causative agents, new organisms have come out with great threat to hospitals as theypossess antibiotic resistance property e.g. production of biofilm, production of enzymes such as β- lactamases. Among many organisms, Acinetobacterbaumannii has emerged as a potent nosocomial pathogen. Our objective of this study was to find the burden of Acinetobacter baumannii infectionswhich are associated as nosocomial infections and to determine the drug of choice for an effective treatment.Methods: Clinical specimens were collected from patients of different unit of the hospital by maintaining universal precautions and standardmicrobiological protocols. All the respective specimens were cultured in respective culture medium i.e. MacConkey agar, blood agar, chocolate agar,cysteine lactose electrolyte deficient (CLED) agar and, fluid thioglycolate (TG) medium at 37˚C for 24-48 hours. After incubation of 24-48 hours cultureplates were examined for bacterial growth and identification and antibiotic sensitivity test was made by Vitek2 compact.Result: The study was conducted at the department of microbiology from January 2016 to April 2016. A total of 2582 specimens were collected andprocessed for identification and sensitivity testing. Specimens of all age group (2 days- 93 years) and both sexes were processed for identificationof A. baumannii and antibiotic sensitivity testing. A total of 119 isolates (4.60%) of A. baumannii were obtained from 2582 clinical specimens. Themost common infection A. baumannii was found as lower respiratory tract infection (89.07%) followed by abscess (6.72%), septicaemia (2.52%),urinary tract infections (0.84%), and soft tissue infections (0.84%). The maximum sensitivity of A. baumannii isolates were seen to Colistin (CL) (119,100%), followed by Tigecycline (TGC) (63, 52.94%) and Minocycline (MIN) (27, 22.69%). The maximum resistant was observed for Imipenem (IMI),Aztreonam (AZT) and Ticarcillin- clavulanic acid (TIC) (119, 100%).Conclusion: The Gram- negative coccobacillus, Acinetobacter baumannii poses a formidable threat to patients. It has emerged as a superbug inhospital environment particularly in ICU units. The chances of A. baumannii infections increase in the presence of iatrogenic factors like inadequatelong- term antibiotic therapy and new interventions in a medical facility. To control the burden of Acinetobacter infections new therapies suchas combine therapy must be obtained and followed with proper dose as recommend by physicians; along with awareness of the importance ofthis infection should be implicated. Proper sanitation, good housekeeping, sterilization of equipment, hand hygiene, water purification, isolationprocedures and maintaining of the hospital environment, use of infection control practices are some of the measures to control the transmission ofAcinetobacter spp. among hospital personnel.Keywords: Acinetobacter baumannii, Biofilm, β-lactamases, Hospital acquired infection.

scholarly journals EPIDEMIOLOGY, BACTERIAL PROFILE, AND ANTIBIOTIC SENSITIVITY OF LOWER RESPIRATORY TRACT INFECTIONS IN SANA’A AND DHAMAR CITY, YEMEN

2020 ◽  
Author(s):  
Abdulrahman Y. Al-Haifi ◽  
Abdul Salam Mohamed Al Makdad ◽  
Mohammed Kassim Salah ◽  
Hassan A. Al-Shamahy ◽  
Wadee Abdullah Abdulwahid Al Shehari
Keyword(s):  
Peer Review ◽  
High Resistance ◽  
Bacterial Pathogens ◽  
Demographic Data ◽  
Antibiotic Sensitivity ◽  
High Rate ◽  
Diffusion Method ◽  
Sensitivity Testing ◽  
Tract Infections ◽  
E Mail

Objectives:  Lower respiratory infections (LRTIs) are the leading reason of death infectious diseases in the world and the fifth leading cause of death in general. The study aimed to identify the general characteristics of LRTI, the causative bacteria and the results of sensitivity to antibiotics. Subjects and methods:  A multicentre prospective study was performed at 3 University hospitals. The study included 555 clinical diagnostic cases as LRTI cases, 328 male and 227 female, aged 3 to 69 years. Clinical and demographic data were collected in the standard questionnaire, and samples included sputum or bronchial lavage (BAL) staining and culture. Samples were cultured in 3 different bacterial media, blood agar and LJ slope, chocolate agar with Co2; cultures were then examined for possible bacterial pathogens of LRTI. Possible bacterial pathogens were isolated and identified by standard laboratory techniques, and microbial sensitivity testing was carried out by disc diffusion method. Results:  LRTI was recorded among all age groups and with less frequency in children less than 16 years of age. A large number of LRTI (36.2%) was not diagnosed, most in CAP (52.4%), followed by HAP (33.9%) while unidentified cases were lower in AECOPD (22.8%). CAP isolates are K. pneumoniae (26.2%), S. pyogens (12.3%), and S. pneumoniae (9%); in HAP are MSSA (24%), E. Coli (12.9%), MRAS (11.1%), K. pneumoniae (10.5%) and P. aeruginosa (7%); and in AECOPD are M. catarrhalis (47.2%), K. pneumoniae (17.2%), H. influnzae (10.7%) and P. aeruginosa (2%). In Gram-positive bacteria, high resistance to ampicillin/sulbactam (100%) and amoxicillin/clavulanate (100%) was recorded, while moderate resistance to amikacin, vancomycin, cefepime and moxifloxacin was recorded. In Gram-negative bacteria, a high resistance to 3rd g Cephalosporin’s  (68.5%) was recorded, while a moderate sensitivity to the other antibiotics tested was recorded. Conclusion:  There is a high rate of undiagnosed LRTI in Yemen and this highlights the need for health authorities to develop strategies to diagnose most of the causes of LRTI, including Mycoplasma, Chlamydia, and viral causes. No antibiotics are completely effective in treating LRTI in our area and antibiotic sensitivity should be performed in all cases. Peer Review History: Received 22 April 2019; Revised 4 May; Accepted 9 May, Available online 15 May 2020 UJPR follows the most transparent and toughest ‘Advanced OPEN peer review’ system. The identity of the authors and, reviewers will be known to each other. This transparent process will help to eradicate any possible malicious/purposeful interference by any person (publishing staff, reviewer, editor, author, etc) during peer review. As a result of this unique system, all reviewers will get their due recognition and respect, once their names are published in the papers. We expect that, by publishing peer review reports with published papers, will be helpful to many authors for drafting their article according to the specifications. Auhors will remove any error of their article and they will improve their article(s) according to the previous reports displayed with published article(s). The main purpose of it is ‘to improve the quality of a candidate manuscript’. Our reviewers check the ‘strength and weakness of a manuscript honestly’. There will increase in the perfection, and transparency. Received file Average Peer review marks at initial stage: 6.0/10 Average Peer review marks at publication stage: 8.0/10 Reviewer(s) detail: Name: Dr. Michael Otakhor Erhunmwunse Affiliation: St. Philomena Catholic Hospital, Nigeria E-mail: [email protected]   Name: Dr. Amany Mohamed Alboghdadly Affiliation: Princess Nourah bint abdulrahman university, Riyadh E-mail: [email protected] Comments of reviewer(s): Similar Articles: BIOFILM FORMATION AND ANTIBIOTIC SUSCEPTIBILITY OF UROPATHOGENS IN PATIENTS WITH CATHETER ASSOCIATED URINARY TRACT INFECTIONS IN IBB CITY -YEMEN PREVALENCE, ANTIMICROBIAL SUSCEPTIBILITY PATTERN AND RISK FACTORS OF MRSA ISOLATED FROM CLINICAL SPECIMENS AMONG MILITARY PATIENTS AT 48 MEDICAL COMPOUND IN SANA'A CITY-YEMEN

scholarly journals Antimicrobial Sensitivity Pattern of Microorganisms Isolated from Vaginal Infections at a Tertiary Hospital in Bangalore, India

2015 ◽  
Vol 3 (1) ◽  
pp. 34-39 ◽  
Author(s):  
Nagalakshmi Narayana-Swamy ◽  
Padmasri Ramalingappa ◽  
Urvashi Bhatara
Keyword(s):  
Low Frequency ◽  
Antibiotic Sensitivity ◽  
Tertiary Hospital ◽  
Vaginal Swab ◽  
Diffusion Method ◽  
Sensitivity Testing ◽  
Vaginal Infections ◽  
Treatment Protocols ◽  
Antimicrobial Sensitivity ◽  
Sensitivity Pattern

Background: The vagina contains dozens of microbiological species in variable quantities and is, therefore, considered a complex environment. Among the microorganisms, bacteria have important repercussions on women’s health. The present study was conducted to elucidate this type of vaginal isolates and their sensitivity towards currently used antibiotics. Methods: This was a retrospective study conducted at the Department of Obstetrics and Gynaecology, Sapthagiri Hospital, Bangalore, India from January 2012 to December 2013. All symptomatic women who had a high vaginal swab taken for culture and sensitivity testing were included in this study. Antibiotic susceptibility was tested using disc diffusion method (modified Kirby-Bauer’s method). The antibiotic sensitivity patterns of isolated microorganisms were studied. Results: Out of 200 patients, 95% had positive vaginal cultures. Fifteen types of microorganisms were isolated. The highest frequency of infection was seen at the age of 20-30 years, followed by 41-50 years and 31-40 years, and a low frequency of infection was observed above 50 years of age. The most prevalent pathogen was Escherichia coli, followed by Streptococcus agalactiae and diphtheroids with equal incidence. Among the antibiotics tested, isolated pathogens were completely resistant to nalidixic acid and highly sensitive to meropenem and imepenem. Conclusion: The high prevalence of gynaecological infections demands that patients with symptoms undergo thorough investigation with cultures and sensitivity essays. Changes in treatment protocols are required to treat vaginal infections effectively.

scholarly journals Bacteremic Pneumonia Caused by Penicillin-Resistant Pneumococci: Case Report and Review with a Canadian Perspective

1992 ◽  
Vol 3 (4) ◽  
pp. 185-188
Author(s):  
David R Burdge ◽  
Vincent C Woo ◽  
Patricia MA Ritchie
Keyword(s):  
Antibiotic Resistance ◽  
Case Report ◽  
Streptococcus Pneumoniae ◽  
Minimal Inhibitory Concentration ◽  
Inhibitory Concentration ◽  
Penicillin Resistance ◽  
Sensitivity Testing ◽  
Antimicrobial Sensitivity ◽  
Canadian Perspective ◽  
Bacteremic Pneumonia

A Canadian adult with bacteremic pneumonia caused by a relatively penicillin-resistant (minimal inhibitory concentration 0.25 μg/mL) Streptococcus pneumoniae is reported, and the published literature regarding penicillin-resistant pneumococci in Canada reviewed. Although penicillin resistance has been reported infrequently to date, this case emphasizes the need for routine antimicrobial sensitivity testing of all pneumococci isolated from normally sterile sites, and for ongoing systematic surveillance for penicillin and other antibiotic resistance in Canada.

Urinary tract infection

2017 ◽  
Author(s):  
Magnus Grabe ◽  
Björn Wullt
Keyword(s):  
Urinary Tract ◽  
Urinary Tract Infections ◽  
Antimicrobial Agents ◽  
Antibiotic Sensitivity ◽  
Resistance Pattern ◽  
Sensitivity Testing ◽  
Efficient Treatment ◽  
Treatment Regimens ◽  
Recommended Treatment ◽  
Tract Infections

Infections of the urinary tract are among the most frequent infections encountered in the community and hospital environments. They range from harmless self-curing cystitis to severe pyelonephritis with life-threatening sepsis. Urinary tract infections are often recurrent. Host defence is crucial to control the infection but can also be deleterious in terms of scar formation. Early diagnosis, determination of severity, evaluation of possible risk factors, and assumption of possible pathogen are essential aspects to initiate efficient treatment. Urine culture with antibiotic sensitivity testing is the most important tool to confirm a suspected clinical diagnosis and direct treatment. Patients with urological disease are particularly susceptible to urinary tract infections, and healthcare-associated urinary infections are observed in approximately 10% of hospitalized urological patients. In view of the worsening resistance pattern of common urinary pathogens against available antimicrobial agents, it is important to comply with recommended treatment regimens.

scholarly journals Detection of biofilm among uropathogenic Escherichia coli and its correlation with antibiotic resistance pattern

2019 ◽  
Vol 11 (01) ◽  
pp. 017-022 ◽  
Author(s):  
Rashmi M. Karigoudar ◽  
Mahesh H. Karigoudar ◽  
Sanjay M. Wavare ◽  
Smita S. Mangalgi
Keyword(s):  
Escherichia Coli ◽  
Antibiotic Resistance ◽  
Biofilm Formation ◽  
Agar Plate ◽  
Diffusion Method ◽  
Resistance Pattern ◽  
Susceptibility Pattern ◽  
Sensitivity Testing ◽  
E Coli ◽  
Tract Infections

Abstract BACKGROUND: Escherichia coli accounts for 70%–95% of urinary tract infections (UTIs). UTI is a serious health problem with respect to antibiotic resistance and biofilms formation being the prime cause for the antibiotic resistance. Biofilm can restrict the diffusion of substances and binding of antimicrobials. In this context, the present study is aimed to perform in vitro detection of biofilm formation among E. coli strains isolated from urine and to correlate their susceptibility pattern with biofilm formation. MATERIALS AND METHODS: A total of 100 E. coli strains isolated from patients suffering from UTI were included in the study. The identification of E. coli was performed by colony morphology, Gram staining, and standard biochemical tests. The detection of biofilm was carried out by Congo Red Agar (CRA) method, tube method (TM), and tissue culture plate (TCP) method. Antimicrobial sensitivity testing was performed by Kirby–Bauer disc diffusion method on Muller–Hinton agar plate. RESULTS: Of the 100 E. coli strains, 49 (49%) and 51 (51%) were from catheterized and noncatheterized patients, respectively. Biofilm production was positive by CRA, TM, and TCP method were 49 (49%), 55 (55%), and 69 (69%), respectively. Biofilm producers showed maximum resistance to co-trimoxazole (73.9%), gentamicin (94.2%), and imipenem (11.6%) when compared to nonbiofilm producers. Significant association was seen between resistance to antibiotic and biofilm formation with a P = 0.01 (<0.05). CONCLUSION: A greater understanding of biofilm detection in E. coli will help in the development of newer and more effective treatment. The detection of biofilm formation and antibiotic susceptibility pattern helps in choosing the correct antibiotic therapy.

scholarly journals Cantilever Sensors for Rapid Optical Antimicrobial Sensitivity Testing

ACS Sensors ◽  
2020 ◽  
Vol 5 (10) ◽  
pp. 3133-3139 ◽  
Author(s):  
Isabel Bennett ◽  
Alice L. B. Pyne ◽  
Rachel A. McKendry
Keyword(s):  
Sensitivity Testing ◽  
Cantilever Sensors ◽  
Antimicrobial Sensitivity

scholarly journals Urinary tract infection and indwelling urinary catheters: prospective study in gynecological surgery with antibiotic prophylaxis

2015 ◽  
Vol 133 (6) ◽  
pp. 517-520 ◽  
Author(s):  
José Carlos Carraro-Eduardo ◽  
Daniela da Silva Alves ◽  
Ingrid Ellis Hinden ◽  
Ivan Penaloza Toledano ◽  
Sarah Gomes Freitas ◽  
...  
Keyword(s):  
Urinary Tract ◽  
Bacterial Growth ◽  
Antibiotic Sensitivity ◽  
Urine Samples ◽  
Gynecological Surgery ◽  
Urinary Catheters ◽  
Sensitivity Testing ◽  
Cell Counts ◽  
Catheter Design ◽  
Tract Infections

ABSTRACT CONTEXT AND OBJECTIVES: Urinary tract infections are the most common cause of hospital-acquired infections, and the use of indwelling urinary catheters is a predisposing factor for their development. The aims of this study were to estimate the frequency of pre and postoperative bacteriuria, identify the microorganisms involved, count the colony-forming units, determine the antibiotic sensitivity profile and compare the results from pre and postoperative urinalyses among women undergoing gynecological surgery with implantation of a urinary catheter. DESIGN AND SETTING: Non-controlled prospective observational single-cohort epidemiological study carried out at a university hospital. METHODS: Urine samples were collected before and 24 hours after catheterization for urinalysis, culturing and antibiotic sensitivity testing. Pre and postoperative urinalyses were compared using Wilcoxon and McNemar non-parametric tests. RESULTS: Fifty-one women participated in the study. Escherichia coligrew in six preoperative samples (11.8%) and Klebsiella pneumoniae in one (1.9%), but bacterial growth did not occur in any postoperative sample. Urinalysis showed lower number of pus cells in the postoperative urine samples (P < 0.05). There were no differences in red blood cell counts or in the nitrite and leukocyte esterase tests, between the samples. CONCLUSION: Bacteriuria was found in 13.7% of the preoperative samples. Gram-negative bacteria sensitive to most antibiotics were identified. In the postoperative samples, no bacterial growth was observed. Urinalysis only showed significant reduction of leukocyturia in the postoperative period.

scholarly journals Correlation of biofilm production with antibiotic susceptibility pattern of Pseudomonas aeruginosa from various clinical specimens

2022 ◽  
Vol 13 (1) ◽  
pp. 88-92
Author(s):  
M Swapna ◽  
G Sumathi ◽  
M Anitha
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Antibiotic Resistance ◽  
Biofilm Formation ◽  
Antibiotic Sensitivity ◽  
Microtiter Plate ◽  
Resistance Pattern ◽  
Sensitivity Testing ◽  
Clinical Specimens ◽  
Biofilm Production ◽  
Microbiological Methods

Background: Pseudomonas aeruginosa is one of the most prevalent nosocomial pathogens that cause a life-threatening infection. One of the important characteristics of P. aeruginosa is biofilm formation which leads to antibiotic resistance. Aims and Objectives: The aim of the study was to study the antibiotic resistance pattern of P. aeruginosa isolates and correlation with their biofilm-production. Materials and Methods: A total of 87 P. aeruginosa isolates from different clinical specimens were processed and confirmed by conventional microbiological methods as per standard methodology. Antibiotic sensitivity testing was done for all isolates. Biofilm producing isolates were identified by the microtiter plate method (MTPM). Results: Of 87 P. aeruginosa isolates, majority were from pus 33 (38%), followed by urine 26 (30%), sputum 19 (22%), body fluids 7 (8%), and blood 2 (2%). Biofilm producing isolates showed more resistance in comparison to non-biofilm producers. The observed difference between biofilm formation for multidrug resistant and susceptible isolates was found to be statistically significant. Conclusion: MTPM method was an effective test for detection of biofilm formation and was also able to verify biofilm production by P. aeruginosa. This indicated a higher propensity among the clinical isolates of P. aeruginosa to form biofilm and revealed a positive correlation between biofilm formation and antibiotic resistance. This indicates the need for testing of even susceptible isolates for virulence factors such as biofilm production.

Determination of ESBL Production & Antibiotic Resistance Profile of Escherichia Coli Isolated from Patients with Urinary Tract Infections: A Study from Tertiary Care Hospital

2020 ◽  
Vol 7 (1) ◽  
pp. 23-29
Author(s):  
Gunjal P. N. ◽  
Gunjal S. P.
Keyword(s):  
Urinary Tract ◽  
Tertiary Care Hospital ◽  
Tertiary Care ◽  
Antibiotic Sensitivity ◽  
Multidrug Resistant ◽  
Care Hospital ◽  
Esbl Production ◽  
Sensitivity Testing ◽  
E Coli ◽  
Tract Infections

Urinary tract infection (UTI), is defined as a disease caused by invasion of urinary tract by microorganisms. Majority of UTI cases are due to bacterial infection constitute about 95% of total UTI cases. About 80% of UTI cases are caused by E.coli producing extended spectrum ?-lactamase (ESBL) producing isolates. In recent years limitations in treating infections caused by multidrug resistant organisms has increased. This study aims to determine ESBL production of E. coli cases from a tertiary care hospital. Methodology: A total 358 midstream urine samples were collected by random sampling method during March 2015 to June 2018. Identification, antibiotic sensitivity testing, performed according to standard protocol following Clinical and Laboratory Standard Institute (CLSI) guidelines, 2013. Screening for ESBL producing E.coli isolates performed using ceftazidime further confirmation done by phenotypic disc diffusion test using combined disc method using ceftazidime (30µg) & ceftazidime/ clavulanic acid (30/10 µg) as per CLSI guidelines. Results: Total 358 specimens processed for urine culture. Gram negative bacilli isolated from 123(34.35 %), out of which 68 (55.28%) were E.coli, 19 (15.44%) K. pneumoniae, 15 (12.19%), Pseudomonas spp. 08 (6.50%), Citrobacter spp and Acinetobacter spp, 03 (2.43%), Proteus mirabilis, 01 (0.81%) Proteus vulgaris and Enterobacter respectively. Out of 68 isolates of E.coli, 65 (95.58%) were MDR, ESBL was detected in 31 (47.69%) out of these 65 isolates. Out of these 31 cases 19 (61.29%) were female and 12 (38.70%) were male cases. Conclusion: This study concludes 47.69% ESBL producing MDR E. coli were isolated from UTI cases with female predominance.

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