Antimicrobial Usage and Detection of Multidrug-Resistant Staphylococcus aureus, Including Methicillin-Resistant Strains in Raw Milk of Livestock from Northern Kenya

2020 ◽  
Author(s):  
Isaac Omwenga ◽  
Gabriel O. Aboge ◽  
Eric S. Mitema ◽  
George Obiero ◽  
Catherine Ngaywa ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Raw Milk ◽  
Multidrug Resistant ◽  
Methicillin Resistant ◽  
Northern Kenya ◽  
Antimicrobial Usage ◽  
Resistant Strains

Intravenous Antibiotics Used in the Treatment of Methicillin-Resistant Staphylococcus Aureus

2015 ◽  
Vol 26 (3) ◽  
pp. 233-243
Author(s):  
Kristine Anne Scordo
Keyword(s):  
Staphylococcus Aureus ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Multidrug Resistant ◽  
Medical Procedures ◽  
Term Care ◽  
Methicillin Resistant ◽  
Intravenous Antibiotics ◽  
Resistant Strains ◽  
Hospital Acquired

Methicillin-resistant Staphylococcus aureus (MRSA) continues to cause significant morbidity and mortality. Despite advances in medical care, the prevalence of both community-acquired and hospital-acquired MRSA has progressively increased. Community-acquired MRSA typically occurs in patients without recent illness or hospitalization, presents as acute skin and soft tissue infections, and is usually not multidrug resistant. Hospital-acquired MRSA, however, presents in patients recently hospitalized or treated in long-term care settings and in those who have had medical procedures and is usually associated with multidrug-resistant strains. Both types of infections, if not properly treated, have the potential to become invasive. This article discusses current intravenous antibiotics that are available for the empiric treatment of MRSA infections along with a newer phenomenon known as the “seesaw effect.”

scholarly journals Antibiotic Resistance and Virulence Gene Characteristics of Methicillin-Resistant Staphylococcus aureus (MRSA) Isolated from Healthy Edible Marine Fish

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Justine Fri ◽  
Henry A. Njom ◽  
Collins N. Ateba ◽  
Roland N. Ndip
Keyword(s):  
Staphylococcus Aureus ◽  
Antibiotic Resistance ◽  
Marine Fish ◽  
Control Strategies ◽  
Virulence Gene ◽  
Multidrug Resistant ◽  
Methicillin Resistant ◽  
Vancomycin Mics ◽  
Resistant Strains ◽  
Mrsa Strains

Thirty-three (33) isolates of methicillin-resistant Staphylococcus aureus (MRSA) from healthy edible marine fish harvested from two aquaculture settings and the Kariega estuary, South Africa, were characterised in this study. The phenotypic antimicrobial susceptibility profiles to 13 antibiotics were determined, and their antibiotic resistance determinants were assessed. A multiplex PCR was used to determine the epidemiological groups based on the type of SCCmec carriage followed by the detection of staphylococcal enterotoxin-encoding genes sea-sed and the Panton Valentine leucocidin gene (pvl). A high antibiotic resistance percentage (67–81%) was observed for Erythromycin, Ampicillin, Rifampicin, and Clindamycin, while maximum susceptibility to Chloramphenicol (100%), Imipenem (100%), and Ciprofloxacin (94%) was recorded. Nineteen (58%) of the MRSA strains had Vancomycin MICs of ≤2 μg/mL, 4 (12%) with MICs ranging from 4–8 μg/mL, and 10 (30%) with values ≥16 μg/mL. Overall, 27 (82%) isolates were multidrug-resistant (MDR) with Erythromycin-Ampicillin-Rifampicin-Clindamycin (E-AMP-RIP-CD) found to be the dominant antibiotic-resistance phenotype observed in 4 isolates. Resistance genes such as tetM, tetA, ermB, blaZ, and femA were detected in two or more resistant strains. A total of 19 (58%) MRSA strains possessed SCCmec types I, II, or III elements, characteristic of healthcare-associated MRSA (HA-MRSA), while 10 (30%) isolates displayed SCCmec type IVc, characteristic of community-associated MRSA (CA-MRSA). Six (18%) of the multidrug-resistant strains of MRSA were enterotoxigenic, harbouring the see, sea, or sec genes. A prevalence of 18% (6/33) was also recorded for the luk-PVL gene. The findings of this study showed that marine fish contained MDR-MRSA strains that harbour SCCmec types, characteristic of either HA-MRSA or CA-MRSA, but with a low prevalence of enterotoxin and pvl genes. Thus, there is a need for continuous monitoring and implementation of better control strategies within the food chain to minimise contamination of fish with MDR-MRSA and the ultimate spread of the bug.

scholarly journals Comparative Study of the Susceptibilities of Major Epidemic Clones of Methicillin-Resistant Staphylococcus aureus to Oxacillin and to the New Broad-Spectrum Cephalosporin Ceftobiprole

2008 ◽  
Vol 52 (8) ◽  
pp. 2709-2717 ◽  
Author(s):  
Marilyn Chung ◽  
Aude Antignac ◽  
Choonkeun Kim ◽  
Alexander Tomasz
Keyword(s):  
Staphylococcus Aureus ◽  
Great Majority ◽  
Multidrug Resistant ◽  
Protein Product ◽  
Penicillin Binding Protein ◽  
Active Constituent ◽  
Low Frequencies ◽  
Methicillin Resistant ◽  
Resistant Strains ◽  
Mrsa Strains

ABSTRACT Multidrug-resistant strains of Staphylococcus aureus continue to increase in frequency worldwide, both in hospitals and in the community, raising serious problems for the chemotherapy of staphylococcal disease. Ceftobiprole (BPR; BAL9141), the active constituent of the prodrug ceftobiprole medocaril (BAL5788), is a new cephalosporin which was already shown to have powerful activity against a number of bacterial pathogens, including S. aureus. In an effort to test possible limits to the antibacterial spectrum and efficacy of BPR, we examined the susceptibilities of the relatively few pandemic methicillin-resistant S. aureus (MRSA) clones that are responsible for the great majority of cases of staphylococcal disease worldwide. We also included in the tests the highly oxacillin-resistant subpopulations that are present with low frequencies in the cultures of these clones. Such subpopulations may represent a natural reservoir from which MRSA strains with decreased susceptibility to BPR may emerge in the future. We also tested the efficacy of BPR against MRSA strains with reduced susceptibility to vancomycin and against MRSA strains carrying the enterococcal vancomycin resistance gene complex. BPR was shown to be uniformly effective against all these resistant MRSA strains, and the mechanism of superb antimicrobial activity correlated with the strikingly increased affinity of the cephalosporin against penicillin-binding protein 2A, the protein product of the antibiotic resistance determinant mecA.

Nasal carriage of highly resistant methicillin resistant Staphylococcus aureus (MRSA) strains by hospital staff in Hazara region of Pakistan

2020 ◽  
pp. 1-12
Author(s):  
Maria Rukan ◽  
Humaira Jamil ◽  
Habib Ali Bokhari ◽  
Aamer Ali Khattak ◽  
Allah Nawaz Khan ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Methicillin Resistance ◽  
Hospital Staff ◽  
Multidrug Resistant ◽  
Operation Theatre ◽  
Methicillin Resistant ◽  
Theatre Staff ◽  
Resistant Strains ◽  
Polymerase Chain

Abstract Objective: To isolate and characterise multidrug resistant strains of Staphylococcus aureus from healthcare workers who are at potential risk of nosocomial infections. Methods: The observational, cross-sectional study was conducted from November 2014 to April 2015 at different hospitals of Haripur and Abbottabad, Pakistan, and comprised ward and operation theatre staff. The isolates were identified on the basis of microbiological and biochemical tests and further confirmed by polymerase chain reaction. Disc diffusion method was used for antibiotic sensitivity testing, and panton valentine leukocidin and methicillin resistance mecA genes were detected using polymerase chain reaction. Results: Of 208 isolates, 108(52%) were from the ward staff and 100(48%) were from the operation theatre staff. Overall, 167(80.3%) isolates were positive for Staphylococcus aureus, and 75(36%) were methicillin-resistant Staphylococcus aureus. The number of antibiotic-resistant isolates was 75(45%) cefoxitin, 60(36%) ofloxacin, 152(91%) erythromycin, 52(31%) doxycycline, 127(76%) lincomycin, 53(32%) amoxicillin-clavulanate, 67(40%) ciprofloxacin, and 89(53%) ceftriaxone. Conclusion: A high number of hospital staff, including those working in operation theatres, were found to be carrying methicillin-resistant Staphylococcus aureus and multidrug resistant strains in their nasal passage that may be a source of infection to patients. Key Words: Methicillin resistance, Nosocomial infections, Vancomycin, MecA gene, Pvl gene. Continuous....

scholarly journals Staphylococcus aureus Bacteria Resistant to Methicillin in Raw Milk

2019 ◽  
pp. 1-8
Author(s):  
Farnush Kazemi ◽  
Shila Safaeian ◽  
Roxana Moogouei
Keyword(s):  
Staphylococcus Aureus ◽  
Raw Milk ◽  
Human Infection ◽  
Animal Origin ◽  
Resistance Pattern ◽  
Methicillin Resistant ◽  
Clinical Complications ◽  
Food Of Animal Origin ◽  
Wide Range ◽  
Resistant Strains

The presence of antibiotic-resistant strains of Staphylococcus aureus (particularly methicillin-resistant strains) in food of animal origin is considered as a severe threat to human health due to numerous clinical complications. This study tended to determine the prevalence of methicillin-resistant S. aureus in samples of raw milk distributed in Tehran using antibiotic susceptibility testing methods. In the present study, 100 raw milk samples were taken from the centres of production and purchase of milk and its products in Tehran; the samples were evaluated by culture in terms of infection with coagulase-positive S. aureus. Finally, antibiotic resistance pattern of isolates was studied using disk diffusion agar. The average colony count was estimated. Raw milk cultures were estimated at 2×105-4×105 cfu/ml. Based on the results of culture, 36 samples of raw milk tested were icnfected with positive-coagulase S. aureus. The highest susceptibility was observed for ciprofloxacin and gentamicin (100%) and the highest resistance was observed to penicillin, tobramycin, oxacillin and ceftazidime. The results showed the prevalence of infection of raw milk with S. aureus. Moreover, prevalence of S. aureus resistant to a wide range of antibiotics, more importantly, methicillin resistant, was significant in the tested samples. Therefore, adherence to and control of sanitation in different stages of production, supply and consumption of milk can prevent human infection.

scholarly journals The Prevalence of Virulence Determinants and Antibiotic Resistance Patterns in Methicillin—Resistant Staphylococcus aureus in a Nursing Home in Poland

Pathogens ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 427
Author(s):  
Martyna Kasela ◽  
Agnieszka Grzegorczyk ◽  
Bożena Nowakowicz-Dębek ◽  
Anna Malm
Keyword(s):  
Staphylococcus Aureus ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Variable Number Tandem Repeat ◽  
Multidrug Resistant ◽  
Variable Number ◽  
Pulse Field ◽  
Virulence Determinants ◽  
Gene Encoding ◽  
Methicillin Resistant ◽  
Pulse Field Gel Electrophoresis

Nursing homes (NH) contribute to the regional spread of methicillin-resistant Staphylococcus aureus (MRSA). Moreover, residents are vulnerable to the colonization and subsequent infection of MRSA etiology. We aimed at investigating the molecular and phenotypic characteristics of 21 MRSA collected from the residents and personnel in an NH (Lublin, Poland) during 2018. All MRSA were screened for 20 genes encoding virulence determinants (sea-see, eta, etb, tst, lukS-F-PV, eno, cna, ebpS, fib, bbp, fnbA, fnbB, icaADBC) and for resistance to 18 antimicrobials. To establish the relatedness and clonal complexes of MRSA in NH we applied multiple-locus variable-number tandem-repeat fingerprinting (MLVF), pulse field gel electrophoresis (PFGE), multilocus sequence typing (MLST) and staphylococcal cassette chromosome mec (SCCmec) typing. We identified four sequence types (ST) among two clonal complexes (CC): ST (CC22) known as EMRSA-15 as well as three novel STs—ST6295 (CC8), ST6293 (CC8) and ST6294. All tested MRSA were negative for sec, eta, etb, lukS-F-PV, bbp and ebpS genes. The most prevalent gene encoding toxin was sed (52.4%; n = 11/21), and adhesins were eno and fnbA (100%). Only 9.5% (n = 2/21) of MRSA were classified as multidrug-resistant. The emergence of novel MRSA with a unique virulence and the presence of epidemic clone EMRSA-15 creates challenges for controlling the spread of MRSA in NH.

Non-Multidrug-Resistant, Methicillin-Resistant Staphylococcus aureus in a Neonatal Unit

2014 ◽  
Vol 33 (10) ◽  
pp. e252-e259 ◽  
Author(s):  
Cilmara P. Garcia ◽  
Juliana F. Rosa ◽  
Maria A. Cursino ◽  
Renata D. Lobo ◽  
Carla H. Mollaco ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Multidrug Resistant ◽  
Neonatal Unit ◽  
Methicillin Resistant

Fluoroquinolone- and Methicillin-Resistant Staphylococcus Aureus: Insights from the Antimicrobial Resistance Management Program

2005 ◽  
Vol 21 (3) ◽  
pp. 123-128 ◽  
Author(s):  
John G Gums ◽  
Benjamin J Epstein
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Resistance ◽  
Methicillin Resistance ◽  
Resistance Management ◽  
Multidrug Resistant ◽  
Management Program ◽  
Methicillin Resistant ◽  
The North ◽  
The Us ◽  
Northeast Us

Background: Staphylococcus aureus is a frequent cause of infections involving the bloodstream, skin and soft tissue, and lungs in hospitalized patients. These isolates are often multidrug resistant and represent a major therapeutic challenge. Objective: To explore the susceptibilities of S. aureus to nafcillin/oxacillin, a surrogate for methicillin resistance, and the fluoroquinolones and determine whether a relationship might exist between fluoroquinolone use and the prevalence of methicillin-resistant S. aureus (MRSA). Methods: To date, 353 institutions throughout the US and Puerto Rico have enrolled in the Antimicrobial Resistance Management (ARM) Program, and data have been submitted on nearly 5 million isolates of S. aureus. Isolates submitted from 1990 through 2002 were reviewed for sensitivity to nafcillin/oxacillin, clindamycin, erythromycin, and the fluoroquinolones ciprofloxacin and levofloxacin. Results: From 1990 through 2002 inclusive, susceptibility to nafcillin/oxacillin nationally was 64.9% (n = 360,460), ranging from 62.2% in the North Central and Northeast US to 72.8% in the Southwest. Nationally, S. aureus isolates were more resistant to levofloxacin (41.4%, n = 123,868) than ciprofloxacin (38.7%, n = 256,178). The greatest change in susceptibility of S. aureus to nafcillin/oxacillin and ciprofloxacin occurred concurrently from 1998 to 2002, which may implicate fluoroquinolone use with increasing rates of MRSA infection. Conclusions: Resistance to methicillin and the fluoroquinolones has increased in concert during the past 5 years. Collectively, data from the ARM Program, along with several other investigations, support a role of fluoroquinolone use in the emergence of MRSA. These observations, along with increasing resistance among gram-positive and gram-negative pathogens, underscore the need for judicious use of fluoroquinolones.

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