Identification of Methicillin Resistance Staphylococcus aureus From Clinical Samples  and Environments of a General Hospital in Osogbo

Infections associated with Staphylococcus aureus (S.aureus) have high mortality rate and lead to economic loss with a long stay in the hospital. Methicillin-resistant Staphylococcus aureus (MRSA) is one of the major nosocomial pathogens which are acquired in the health care facilities. The objective of the study is to investigate the presence of methicillin-resistant Staphylococcus aureus (MRSA) in clinical sources and hospital environments. Samples were collected, cultured and identified morphologically. Likewise, the antibiotic susceptibility profile was done. Identification was also done molecularly using PCR (Polymerase Chain Reaction) method. Sixty-three isolates were positive for S. aureus out of 370 clinical samples (urine, wound, nasal swabs and pus) and 37 positives out of 262 samples from hospital environments. Majority of the isolates were sensitive to cefoxitin, novobiocin and majority were resistant to ceftazidine, cloxacillin and augmentin. Seventy-one to ninety- five percent and 51-72% exhibited multi-drug resistance among clinical samples and hospital environments respectively. Both samples were positive for nuc and mec A genes. The detection of methicillin-resistant S. aureus (MRSA) in hospital environments may pose a great danger to patients especially those of compromised status.

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Molecular Detection of Methicillin Resistance Genes from Clinical Sources and Hospital Environments

Microbiology Research Journal International ◽

10.9734/mrji/2019/v28i530143 ◽

2019 ◽

pp. 1-7

Author(s):

O. C. Adekunle ◽

T. O. Oyakeye ◽

Y. O. Adesiji

Keyword(s):

Methicillin Resistance ◽

Pcr Amplification ◽

Economic Loss ◽

Health Care Facilities ◽

Multi Drug Resistance ◽

Clinical Samples ◽

Hospital Environments ◽

Nasal Swabs ◽

Care Facilities ◽

Polymerase Chain

Infections associated with Staphylococcus aureus have high mortality rate and lead to economic loss with a long stay in the hospital. Methicillin-resistant S. aureus (MRSA) is one of the major nosocomial pathogens which are acquired in the health care facilities. The objective of the study was to investigate the presence of MRSA in clinical sources and hospital environments. Samples were collected, cultured and identified. Also, the antibiotic susceptibility profile was done. Polymerase chain reaction (PCR) amplification of identification gene nuc- and the resistant gene, mecA were conducted. Sixty-three isolates were positive for S. aureus out of 370 clinical samples (urine, wound, nasal swabs and pus) and 37 positives out of 262 samples from hospital environments. Majority of the isolates were sensitive to cefoxitin, novobiocin and majority were resistant to ceftazidine, cloxacillin and augmentin. Seventy-one to ninety- five percent and 51-72% exhibited multi-drug resistance among clinical samples and hospital environments respectively. Both samples were positive for nuc and mec A genes. The detection of MRSA in hospital environments may pose a great danger to patients especially those of compromised status.

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Methicillin-resistant Staphylococcus aureus in Nepal

Journal of Nepal Medical Association ◽

10.31729/jnma.6251 ◽

2021 ◽

Vol 59 (237) ◽

Author(s):

Lok Bahadur Shrestha ◽

Gopiram Syangtan ◽

Ajaya Basnet ◽

Krishna Prasad Acharya ◽

Arun Bahadur Chand ◽

...

Keyword(s):

Staphylococcus Aureus ◽

Methicillin Resistant Staphylococcus Aureus ◽

Methicillin Resistance ◽

Multi Drug Resistance ◽

Clinical Samples ◽

Soft Tissue Infections ◽

Methicillin Resistant ◽

Inducible Clindamycin Resistance ◽

Development Of Resistance ◽

Surveillance Mechanism

Staphylococcus aureus is both a frequent commensal and a leading cause of endocarditis, bacteremia, osteomyelitis and skin and soft tissue infections and device-related infections. We performed this minireview to summarize the prevalence of Staphylococcus aureus among clinical samples and estimate the proportion of methicillin-resistant Staphylococcus aureus. The prevalence of Staphylococcus aureus among clinical isolates in Nepal is 34.5%. On average, the proportion of multi-drug resistance in Staphylococcus aureus is 57.1%. Methicillin-resistant Staphylococcus aureus accounts for a total of 41.7%. Inducible clindamycin resistance was detected in about 35% of the isolates. A regular antimicrobial resistance surveillance mechanism is necessary to mitigate the development of resistance among organisms and further spread of superbugs like methicillin-resistance Staphylococcus aureus.

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Phenotypic analysis and antibiotic susceptibility of methicillin-resistant Staphylococcus aureus in Kiambu County, Kenya

The Journal of Infection in Developing Countries ◽

10.3855/jidc.12174 ◽

2020 ◽

Vol 14 (06) ◽

pp. 597-605 ◽

Cited By ~ 1

Author(s):

Sani Iliya ◽

Jonathan Mwangi ◽

Ronald Maathai ◽

Mary Muriuki

Keyword(s):

Staphylococcus Aureus ◽

Antibiotic Susceptibility ◽

Methicillin Resistant Staphylococcus Aureus ◽

Penicillin G ◽

Multi Drug Resistance ◽

Clinical Samples ◽

Preventive Strategy ◽

High Morbidity ◽

Disk Diffusion Test ◽

Methicillin Resistant

Introduction: Methicillin resistant Staphylococcus aureus (MRSA) causes illness to people and can be picked up from both healthcare facilities and the environment leading to high morbidity and mortality. The study was aimed at identifying phenotypic characteristics of Methicillin-Resistant Staphylococcus aureus and determine the antibiotic susceptibility pattern of clinical samples isolated from patients attending or admitted in two health facilities in Kiambu County, Kenya. Methodology: One hundred and thirty-eight (138) clinical samples were collected from patients attending Thika and Kiambu Level-5 Hospitals. The isolates were obtained using standard bacteriological techniques. Methicillin resistance of Staphylococcus aureus was determined using the cefoxitin disk diffusion test. Results: Out of 138 samples, 54 (39.1%) were found to have Staphylococcus aureus of which 22 (40.7%) were shown to be MRSA using the cefoxitin- based susceptibility test. Antibiotic susceptibility testing using Kirby-Bauer technique was performed on all 54 isolates. The highest sensitivity was found in chloramphenicol 46 (85.2%) and lowest in penicillin-G 8 (14.8%). Multi-Drug Resistance (MDR) was reported in 35 (64.8%) of the 54 isolates of Staphylococcus aureus. All 22 MRSA strains were found to be MDR. Conclusions: the data obtained revealed that there is presence of MRSA in healthcare settings in Kiambu County, Kenya with varying antibiotic sensitivity patterns as well as multidrug resistance. The findings will help healthcare workers in the county to develop preventive strategy as well as institute policy for antibiotic usage, infection control and surveillance.

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Growing Resistance to Vancomycin among Methicillin Resistant Staphylococcus Aureus Isolates from Different Clinical Samples

Journal of Nepal Medical Association ◽

10.31729/jnma.2797 ◽

2014 ◽

Vol 52 (196) ◽

pp. 977-981 ◽

Cited By ~ 8

Author(s):

Prakash Chandra Pahadi ◽

Upendra Thapa Shrestha ◽

Nabaraj Adhikari ◽

Pradeep Kumar Shah ◽

Ritu Amatya

Keyword(s):

Staphylococcus Aureus ◽

Methicillin Resistant Staphylococcus Aureus ◽

Methicillin Resistance ◽

Control Measures ◽

Clinical Samples ◽

Dilution Method ◽

Agar Dilution Method ◽

Methicillin Resistant

Introduction: Methicillin resistant Staphylococcus aureus (MRSA), majorly associated with nosocomial and community infections worldwide, are emerging as resistant strains to many antibiotics narrowing down the efficacy of antimicrobial therapy. In order to investigate the changing resistant pattern of MRSA to empirical drugs, the study was carried out at KIST Medical College and Hospital, Nepal. It also aims to determine the minimum inhibitory concentration of vancomycin among MRSA. Methods: Altogether 3500 clinical samples including 1303 blood, 1489 urine and 708 body fluids were collected and processed. Isolated S. aureus were further screened for methicillin resistance by Kirby-Bauer disk diffusion technique using cefoxitin (30μg) disk. All MRSA were subjected to in vitro determination of MIC of vancomycin by agar dilution method as recommended by CLSI guidelines. Results: Total 287 S. aureus were isolated from the different clinical samples. Altogether 248 (86.41%) were found to be multidrug resistance (MDR) while 42 (14.63%) of the isolates were methicillin resistance with the highest prevalence in the age group of 16-30. All 42 (100%) MRSA isolates were resistant to ampicillin and penicillin followed by 41 (97.62%), 32 (76.19%), 31(73.81%), 29 (69.05%), 9 (21.43%) and seven (16.67%) to cefotaxime, gentamycin, cotrimoxazole, erythromycin, tetracycline and ciprofloxacin respectively. Although all MRSA strains were sensitive to vancomycin on disc diffusion, four isolates were intermediates in vitro determination of MIC of vancomycin. The break point for vancomycin was found to be 15mm. Conclusions: The increment in vancomycin MIC among MRSA is alarming. Strict control measures to prevent MRSA spread and a routine surveillance for VRSA must be incorporated in hospitals. Keywords: mdr; mrsa; mic; visa; vrsa.

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Prevalence and antimicrobial susceptibility pattern of Methicillin-Resistant Staphylococcus aureus isolated from various clinical samples of the patients attending in a Tertiary Care Teaching Hospital in Puducherry

International Journal of Research in Pharmaceutical Sciences ◽

10.26452/ijrps.v10i2.721 ◽

2019 ◽

Vol 10 (2) ◽

pp. 1474-1480

Author(s):

Vamsi Muni Krishna P ◽

Sreenivasulu Reddy V ◽

Praveen Kumar V ◽

Suresh P

Keyword(s):

Staphylococcus Aureus ◽

Methicillin Resistant Staphylococcus Aureus ◽

Methicillin Resistance ◽

Tertiary Care ◽

Diffusion Method ◽

Clinical Samples ◽

Isolation And Identification ◽

Methicillin Resistant ◽

Antimicrobial Susceptibility Pattern ◽

Microbiological Methods

Staphylococci spp has been reported as a major cause of hospital and community-associated infections. Staphylococcus aureus is the most common pathogen causing a variety of infections relatively begins minor skin in sections (abscess. cellulitis, staphylococcal scalded skin syndrome) to live threating systemic infections like endocarditis, septic arthritis, pneumonia joint, and bone infections, toxic shock syndrome. Methicillin resistance was reported in 1961 and emerged in the last several decades as one of the most important nosocomial pathogens which were reported just one year of the launch of methicillin. MRSA now a day a big problem is because it is creating life threating problems medical institutions. The knowledge of MRSA prevalence and current antibiogram profile is necessary for the selection of appropriate treatment for related infections. Isolation and identification of Staphylococcus aureus were done by standard conventional microbiological methods. The Methicillin-resistant Staphylococcus aureus strains were tested by using Cefoxitin 30μg disc on Mueller - Hinton agar and antibiotic susceptibility testing were done by Kirby-Bauer disc diffusion method according to Clinical and Laboratory Standards Insititute guidelines (CLSI). All the 164 MRSA (100%) strains were sensitive to Tigecycline, Vancomycin, Teicoplanin followed by Linezolid (92. 68%). Tigecycline, Vancomycin, Teicoplanin has until now excellent activity against clinical isolates of Methicillin-resistant Staphylococcus aureus.

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A STUDY ON THE PREVALENCE AND ANTIMICROBIAL SUSCEPTIBILITY PATTERN OF METHICILLIN RESISTANT STAPHYLOCOCCUS AUREUS ISOLATED FROM CLINICAL SAMPLES

10.36106/ijsr/1325360 ◽

2020 ◽

pp. 28-30

Author(s):

Neha Jha ◽

R. S. Prasad ◽

P. N. Jha ◽

Debarshi Jana

Keyword(s):

Staphylococcus Aureus ◽

Antimicrobial Susceptibility ◽

Methicillin Resistant Staphylococcus Aureus ◽

Methicillin Resistance ◽

Clinical Samples ◽

Susceptibility Pattern ◽

Appropriate Use ◽

Methicillin Resistant ◽

Antimicrobial Susceptibility Pattern ◽

Mrsa Strains

Background: Methicillin Resistant Staphylococcus aureus (MRSA) prevalence is increasing worldwide and it remains as a major cause of morbidity and mortality in hospitalised patients due to its versatile behaviour towards antibiotics. Aims: This study was done to find out the prevalence and antimicrobial susceptibility pattern of MRSA isolates at our hospital setup, in order to guide policy on the appropriate use of antibiotics. Settings and Design: The study was a prospective observational study, carried out in the Department of Microbiology, Darbhanga Medical College, Laheriasarai, Bihar. Methods and Material: A total number of 288 strains of Staphylococcus aureus were isolated from various clinical samples received in the laboratory. Staphylococcus aureus was identified by routine standard operative procedures. Antimicrobial susceptibility testing was done by Kirby-Bauer disc diffusion method and the results were interpreted following Clinical Laboratory Standards Institute (CLSI) guidelines. Methicillin resistance was screened by using oxacillin disks [1 mcg]. Statistical analysis used: Data obtained was analysed and presented in counts and percentages. 95 % confidence interval values were also calculated. Results: Methicillin resistance was documented in 120 [41.6%] Staphylococcus aureus isolates. Most of them were isolated from pus, wound swabs, urine and respiratory samples. All MRSA isolates were resistant to penicillin and cefepime. The resist-ance was high to tetracycline, erythromycin, co-trimoxazolepiperacillin / tazobactam, and ciprofloxacin; moderate to amino-glycosides, clindamycin, chloramphenicol and levofloxacin. All MRSA strains were susceptible to vancomycin. Overall, 63.3% [76/120] of MRSA strains were found to be resistant to more than 6 antimicrobials tested. Conclusions: Our study emphasizes the need for regular surveillance and formulation of a strict drug policy on the appropriate use of antibiotics to control MRSA infections. This would also minimise the irrational use of vancomycin and the emergence of vancomycin resistant Staphylococcus aureus [VRSA].

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Mutation-Based Antibiotic Resistance Mechanism in Methicillin-Resistant Staphylococcus aureus Clinical Isolates

Pharmaceuticals ◽

10.3390/ph14050420 ◽

2021 ◽

Vol 14 (5) ◽

pp. 420

Author(s):

Tanveer Ali ◽

Abdul Basit ◽

Asad Mustafa Karim ◽

Jung-Hun Lee ◽

Jeong-Ho Jeon ◽

...

Keyword(s):

Staphylococcus Aureus ◽

Antibiotic Resistance ◽

Active Site ◽

Methicillin Resistant Staphylococcus Aureus ◽

Meca Gene ◽

Resistance Mechanism ◽

Ligand Docking ◽

Clinical Samples ◽

Allosteric Site ◽

Methicillin Resistant

β-Lactam antibiotics target penicillin-binding proteins and inhibit the synthesis of peptidoglycan, a crucial step in cell wall biosynthesis. Staphylococcus aureus acquires resistance against β-lactam antibiotics by producing a penicillin-binding protein 2a (PBP2a), encoded by the mecA gene. PBP2a participates in peptidoglycan biosynthesis and exhibits a poor affinity towards β-lactam antibiotics. The current study was performed to determine the diversity and the role of missense mutations of PBP2a in the antibiotic resistance mechanism. The methicillin-resistant Staphylococcus aureus (MRSA) isolates from clinical samples were identified using phenotypic and genotypic techniques. The highest frequency (60%, 18 out of 30) of MRSA was observed in wound specimens. Sequence variation analysis of the mecA gene showed four amino acid substitutions (i.e., E239K, E239R, G246E, and E447K). The E239R mutation was found to be novel. The protein-ligand docking results showed that the E239R mutation in the allosteric site of PBP2a induces conformational changes in the active site and, thus, hinders its interaction with cefoxitin. Therefore, the present report indicates that mutation in the allosteric site of PBP2a provides a more closed active site conformation than wide-type PBP2a and then causes the high-level resistance to cefoxitin.

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Livestock-associated methicillin-resistant Staphylococcus aureus (LA-MRSA) prevalence in humans in close contact with animals and measures to reduce on-farm colonisation

Irish Veterinary Journal ◽

10.1186/s13620-021-00200-7 ◽

2021 ◽

Vol 74 (1) ◽

Author(s):

Daniel Crespo-Piazuelo ◽

Peadar G. Lawlor

Keyword(s):

Staphylococcus Aureus ◽

Animal Species ◽

Methicillin Resistant Staphylococcus Aureus ◽

Close Contact ◽

Companion Animals ◽

Health Care Facilities ◽

Community Settings ◽

Methicillin Resistant ◽

Care Facilities ◽

On Farm

AbstractSince the 1940s, Staphylococcus aureus has adapted to the use of different antimicrobials to treat infections. Although S. aureus can act as a commensal bacterium, some strains are facultative pathogens and acquiring them can be fatal. In particular, treating infections caused by S. aureus with acquired antimicrobial resistance is problematic, as their treatment is more difficult. Some of these S. aureus variants are methicillin-resistant S. aureus (MRSA) with prevalence across the globe in health-care facilities, community settings and on livestock farms. Apart from humans, MRSA can colonise other animal species, and because of this, resistance to new antimicrobials can appear and jump between species. Livestock and companion animals are particularly important in this regard considering the relatively high usage of antimicrobials in these species. There is a risk to humans who come into direct contact with animals acquiring MRSA but there is also the risk of animals acquiring MRSA from colonised humans. In this review, we summarise studies conducted worldwide to characterise the prevalence of MRSA in veterinarians, farmers and other personnel who come into close contact with animals. Finally, alternative treatment, preventive measures and on-farm strategies to reduce MRSA introduction to a farm and carriage within a herd are discussed.

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The First Report of a Methicillin-Resistant Staphylococcus aureus Isolate Harboring Type IV SCCmec in Thailand

Pathogens ◽

10.3390/pathogens10040430 ◽

2021 ◽

Vol 10 (4) ◽

pp. 430

Author(s):

Wichai Santimaleeworagun ◽

Praewdow Preechachuawong ◽

Wandee Samret ◽

Tossawan Jitwasinkul

Keyword(s):

Staphylococcus Aureus ◽

Resistance Genes ◽

Methicillin Resistant Staphylococcus Aureus ◽

Methicillin Resistance ◽

Sccmec Type ◽

Clinical Strain ◽

Spa Typing ◽

Methicillin Resistant ◽

Type Iv ◽

Antimicrobial Resistance Genes

Methicillin-resistant Staphylococcus aureus (MRSA) is mostly found in Thailand in the hospital as a nosocomial pathogen. This study aimed to report the genetic characterization of a clinical community-acquired MRSA (CA-MRSA) isolate collected from hospitalized patients in Thailand. Among 26 MRSA isolates, S. aureus no. S17 preliminarily displayed the presence of a staphylococcal cassette chromosome mec (SCCmec) type IV pattern. The bacterial genomic DNA was subjected to whole-genome sequencing. Panton–Valentine leukocidin (PVL) production, virulence toxins, and antibiotic resistance genes were identified, and multi-locus sequence typing (MLST) and spa typing were performed. The strain was matched by sequence to MLST type 2885 and spa type t13880. This strain carried type IV SCCmec with no PVL production. Five acquired antimicrobial resistance genes, namely blaZ, mecA, Inu(A), tet(K), and dfrG conferring resistance to β-lactams, lincosamides, tetracycline, and trimethoprim, were identified. The detected toxins were exfoliative toxin A, gamma-hemolysin, leukocidin D, and leukocidin E. Moreover, there were differences in seven regions in CR-MRSA no. S17 compared to CA-MRSA type 300. In summary, we have reported the ST2885-SCCmec IV CA-MRSA clinical strain in Thailand for the first time, highlighting the problem of methicillin resistance in community settings and the consideration in choosing appropriate antibiotic therapy.

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