1
|
William A, Mitra S, Siddiqui O, Aggarwal P, Saxena S. Utilization of MALDI-TOF MS in the etiological diagnosis of deep-seated anaerobic bacterial infections. Indian J Med Microbiol 2024; 52:100739. [PMID: 39362528 DOI: 10.1016/j.ijmmb.2024.100739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2024] [Revised: 08/17/2024] [Accepted: 09/29/2024] [Indexed: 10/05/2024]
Abstract
PURPOSE Deep-seated abscesses can be caused by a wide array of bacteria in various anatomical sites, the precise identification of which is crucial for implementing organism-specific treatments which can reduce morbidity and mortality. MALDI-TOF MS is a powerful proteomic method for the swift and accurate identification of anaerobic organisms. The aim of this study was to investigate deep-seated infections by MALDI-TOF MS (in comparison to VITEK®2 ANC ID card and phenotypic biochemical tests) and to determine the susceptibility pattern of identified microorganisms. MATERIALS AND METHODS A total of 104 samples from patients suspected of deep-seated infections were aseptically collected and subjected to microscopy, aerobic/anaerobic cultures and subsequent identification via MALDI-TOF MS followed by antimicrobial susceptibility testing. Anaerobic bacteria were also identified using the VITEK-2 system and phenotypic biochemical tests. RESULTS Out of the 104 samples tested, 41.3 % (43/104) showed positive results, predominantly in pus specimens (88 %). Mixed infections were found in 21 % of the positive cases. Of the 52 organisms identified from positive specimens, 19.2 % (10/52) were obligate anaerobes, with Bacteroides fragilis group being the most prevalent, followed by both Clostridium perfringens and Clostridium sporogenes respectively. Escherichia coli was observed to be the most common facultative anaerobic isolate. All obligate anaerobes were successfully identified to the species level via MALDI-TOF MS. In contrast, the VITEK®2 ANC ID card identified only 40 % (4/10) anaerobic bacteria to the species level. All obligate anaerobic organisms showed 100 % susceptibility to metronidazole, vancomycin and ertapenem. 25 % of the Bacteroides spp. and 50 % of Clostridium perfringens isolates were found to be resistant to clindamycin. CONCLUSION MALDI-TOF MS proves as a beneficial diagnostic tool for bacterial identification, eliminating the labour-intensive and time consuming conventional microbiological methods. Its accuracy of bacterial detection further helps in combating antibiotic resistance and improving patient outcomes in deep-seated infections.
Collapse
Affiliation(s)
- Ashish William
- Department of Microbiology, Maulana Azad Medical College and Lok Nayak Hospital, New Delhi, India.
| | - Srestha Mitra
- Department of Microbiology, Maulana Azad Medical College and Lok Nayak Hospital, New Delhi, India.
| | - Oves Siddiqui
- Department of Microbiology, Maulana Azad Medical College and Lok Nayak Hospital, New Delhi, India.
| | - Prabhav Aggarwal
- Department of Microbiology, Maulana Azad Medical College and Lok Nayak Hospital, New Delhi, India.
| | - Sonal Saxena
- Department of Microbiology, Maulana Azad Medical College and Lok Nayak Hospital, New Delhi, India.
| |
Collapse
|
2
|
Mortensen KK, Nielsen HL, Søgaard KK. Clinical and microbiological characteristics of anaerobic bacteremia during 1994-2019: A Danish population-based cohort study. Anaerobe 2024; 89:102898. [PMID: 39147014 DOI: 10.1016/j.anaerobe.2024.102898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2024] [Revised: 08/05/2024] [Accepted: 08/08/2024] [Indexed: 08/17/2024]
Abstract
OBJECTIVES Bacteremia with anaerobic bacteria is generally a marker of severe prognosis. However, population-based data is lacking. Our aim was to describe the epidemiology and the 30-day mortality rate of anaerobic bacteremia in a Danish population-based setting. METHODS In this population-based cohort study, all first-time episodes of anaerobic bacteremia from the North Denmark Bacteremia Research Database during 1994-2019 were identified. Information on comorbidities, discharge diagnoses, and mortality was retrieved. 30-day mortality rates were calculated and a multivariate logistic regression analysis to identify risk factors for death was performed. RESULTS 1750 episodes with anaerobic bacteremia were identified, corresponding to an incidence rate of 12.5 per 100,000 inhabitants (increasing from 11.2 in 1994-2014 to 17.7 in 2015-2019). Of these episodes, a third were polymicrobial, and the majority (70 %) of patients had one or more comorbid conditions. Abdominal infection was the source of bacteremia in 61 % of patients, while it was unknown for 15 %. The most frequently isolated genera were Bacteroides (45 %), Clostridium (20 %) and Fusobacterium (6 %). The overall crude 30-day mortality rate was 27 %, but rates were even higher for patients of high age, with liver disease, and solid tumors. The odds ratio (OR) for 30-day mortality was 1.32 for Clostridium species, and 1.27 for polymicrobial bacteremia with aerobic bacteria. CONCLUSIONS The incidence rate of anaerobic bacteremia increased, and the 30-day mortality rate remained high during the study period. Multiple factors influence 30-day mortality rates, including high age, liver disease, solid tumor, polymicrobial bacteremia, and bacteremia with Clostridium species.
Collapse
Affiliation(s)
- Kasper K Mortensen
- Department of Clinical Microbiology, Aalborg University Hospital, Aalborg, Denmark.
| | - Hans Linde Nielsen
- Department of Clinical Microbiology, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - Kirstine K Søgaard
- Department of Clinical Microbiology, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| |
Collapse
|
3
|
Ferraris L, Delannoy J, Mazuet C, Diancourt L, Mesa-Schein V, Barbut F, Aires J. Clostridium neonatale antimicrobial susceptibility, genetic resistance determinants, and genotyping: a multicentre spatiotemporal retrospective analysis. J Antimicrob Chemother 2024; 79:271-279. [PMID: 38084883 PMCID: PMC10832599 DOI: 10.1093/jac/dkad369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Accepted: 11/21/2023] [Indexed: 02/02/2024] Open
Abstract
BACKGROUND Clostridium neonatale was isolated during an outbreak of neonatal necrotizing enterocolitis (NEC) in 2002. C. neonatale was validated as a new species within the genus Clostridium sensu stricto in 2018. In the present study, we evaluated the antimicrobial susceptibility, genetic determinants of resistance, and phylogenetic relationships of a collection of clinical isolates of C. neonatale. METHODS C. neonatale strains (n = 68) were isolated from the stools of preterm neonates who either developed NEC or were asymptomatic carriers of C. neonatale in different periods and in different hospitals. Antimicrobial susceptibility was determined by the disc diffusion method. The MICs of clindamycin, cefotaxime and tetracycline were determined. Genetic determinants of resistance were screened by PCR (n = 68) and WGS (n = 35). Genotyping of the isolates was performed by MLST. RESULTS Antimicrobial resistance was found to clindamycin (n = 24; 35%), cefotaxime (n = 7; 10%) and tetracycline (n = 1; 1%). One clindamycin-resistant isolate carried erm(B) by PCR. In addition, one isolate carrying tet(M) was tetracycline resistant (MIC = 16 mg/L) and 44 isolates carrying either tet(O), tet(32) or tet(M) were tetracycline susceptible (MICs < 16 mg/L). MLST showed that ST2 and ST15 were significantly associated with tet(32) (P < 0.0001) and tet(O) (P < 0.0001), respectively. From WGS, we identified aph(3')-IIa and blaTEM-116 genes and a blaCBP-1-like gene. CONCLUSIONS C. neonatale is susceptible to anti-anaerobic molecules but resistant to clindamycin, cefotaxime and tetracycline. Genes encoding tetracycline ribosomal protection, macrolide-lincosamide-streptogramin B rRNA methyltransferase, aminoglycoside 3'-phosphotransferase and β-lactamases have been identified in genomic regions flanked by mobile genetic elements.
Collapse
Affiliation(s)
- Laurent Ferraris
- Faculté de Pharmacie de Paris, Université Paris Cité, INSERM, UMR-S 1139 (3PHM), Paris F-75006, France
| | - Johanne Delannoy
- Faculté de Pharmacie de Paris, Université Paris Cité, INSERM, UMR-S 1139 (3PHM), Paris F-75006, France
| | - Christelle Mazuet
- Institut Pasteur, Université Paris Cité, Centre National de Référence des Bactéries anaérobies et Botulisme, Paris F-75015, France
| | - Laure Diancourt
- Institut Pasteur, Université Paris Cité, Centre National de Référence des Bactéries anaérobies et Botulisme, Paris F-75015, France
| | - Victoria Mesa-Schein
- Faculté de Pharmacie de Paris, Université Paris Cité, INSERM, UMR-S 1139 (3PHM), Paris F-75006, France
| | - Frédéric Barbut
- Faculté de Pharmacie de Paris, Université Paris Cité, INSERM, UMR-S 1139 (3PHM), Paris F-75006, France
| | - Julio Aires
- Faculté de Pharmacie de Paris, Université Paris Cité, INSERM, UMR-S 1139 (3PHM), Paris F-75006, France
| |
Collapse
|
4
|
Gao J, Qin J, Ding C, Gao Y, Guo J, Li M, Yang C, Wang W. Fluorescent metabolic labeling-based quick antibiotic susceptibility test for anaerobic bacteria. RSC Chem Biol 2022; 3:1314-1319. [PMID: 36349219 PMCID: PMC9627725 DOI: 10.1039/d2cb00163b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 10/03/2022] [Accepted: 08/01/2022] [Indexed: 03/08/2024] Open
Abstract
Because of the advancements in medicine and science, the numbers of patients surviving complicated diseases are continuously increasing, which in turn leads to elevated chances of anaerobic infections by endogenous bacteria. Traditional growth yield-based antibiotic susceptibility tests (ASTs) against anaerobic bacteria are very time-consuming (≥48 h) and labor intensive, which delays the timely guidance of antibiotic prescription and increases the mortality of patients. Inspired by a fluorescent d-amino acid (FDAA) labeling-based AST (FaAST) that we recently developed for quick determination of aerobic bacteria's susceptibilities, here we report an accurate and fast AST method for anaerobic pathogens. Based on flow cytometry analysis of anaerobes that have been treated with various doses of antibiotics and metabolically labeled with FDAA, the intensities of which can reflect their affected metabolic status by the drugs, the MICs of each drug can then be determined. The whole process can be completed in 5 h. After testing 40 combinations of the representative anaerobic bacteria and antibiotics, our method demonstrates a high susceptibility category accuracy of 95.0%. This FaAST-based protocol is helpful in accurately and quickly guiding antibiotic decisions when treating critical infections caused by anaerobic bacteria.
Collapse
Affiliation(s)
- Juan Gao
- Institute of Molecular Medicine, Renji Hospital, Shanghai Jiao Tong University School of Medicine Shanghai 200127 China
| | - Juanxiu Qin
- Department of Critical Care Medicine, Renji Hospital, Shanghai Jiao Tong University School of Medicine Shanghai 200127 China
| | - Chenling Ding
- Department of Laboratory Medicine, Renji Hospital, Shanghai Jiao Tong University School of Medicine Shanghai 200127 China
| | - Yuan Gao
- Department of Laboratory Medicine, Renji Hospital, Shanghai Jiao Tong University School of Medicine Shanghai 200127 China
| | - Junnan Guo
- The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, Key Laboratory for Chemical Biology of Fujian Province State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemical Biology, College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China
| | - Min Li
- Department of Critical Care Medicine, Renji Hospital, Shanghai Jiao Tong University School of Medicine Shanghai 200127 China
| | - Chaoyong Yang
- Institute of Molecular Medicine, Renji Hospital, Shanghai Jiao Tong University School of Medicine Shanghai 200127 China
- The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, Key Laboratory for Chemical Biology of Fujian Province State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemical Biology, College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China
| | - Wei Wang
- Institute of Molecular Medicine, Renji Hospital, Shanghai Jiao Tong University School of Medicine Shanghai 200127 China
| |
Collapse
|
5
|
Principe L, Sanson G, Luzzati R, Aschbacher R, Pagani E, Luzzaro F, Di Bella S. Time to reconsider moxifloxacin anti-anaerobic activity? J Chemother 2022:1-2. [PMID: 35947127 DOI: 10.1080/1120009x.2022.2106637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Abstract
Large data on moxifloxacin activity on anaerobes are old. Moxifloxacin is often used for empiric therapy therefore the knowledge of current epidemiologic data is fundamental. We analyzed 69 anaerobic strains, from a recent multicenter Italian study, for moxifloxacin susceptibility. Using EUCAST criteria 81% of Bacteroides spp. and 48% of anaerobes other than Bacteroides were resistant to moxifloxacin. Using CLSI criteria moxifloxacin resistance rates decrease to 35% for all anaerobes, and to 41% for Bacteroides spp. We reported an alarming increase in moxifloxacin resistance among anaerobes in Italy.
Collapse
Affiliation(s)
- Luigi Principe
- Clinical Pathology and Microbiology Unit, "San Giovanni di Dio" Hospital, Crotone, Italy
| | - Gianfranco Sanson
- Clinical Department of Medical, Surgical and Health Sciences, Trieste University, Trieste, Italy
| | - Roberto Luzzati
- Clinical Department of Medical, Surgical and Health Sciences, Trieste University, Trieste, Italy
| | - Richard Aschbacher
- Microbiology and Virology Laboratory, Health Service of Bolzano, Bolzano, Italy
| | - Elisabetta Pagani
- Microbiology and Virology Laboratory, Health Service of Bolzano, Bolzano, Italy
| | - Francesco Luzzaro
- Clinical Microbiology and Virology Unit, "A. Manzoni" Hospital, Lecco, Italy
| | - Stefano Di Bella
- Clinical Department of Medical, Surgical and Health Sciences, Trieste University, Trieste, Italy
| |
Collapse
|
6
|
Chiș AA, Rus LL, Morgovan C, Arseniu AM, Frum A, Vonica-Țincu AL, Gligor FG, Mureșan ML, Dobrea CM. Microbial Resistance to Antibiotics and Effective Antibiotherapy. Biomedicines 2022; 10:biomedicines10051121. [PMID: 35625857 PMCID: PMC9138529 DOI: 10.3390/biomedicines10051121] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 05/06/2022] [Accepted: 05/10/2022] [Indexed: 12/24/2022] Open
Abstract
Currently, the efficacy of antibiotics is severely affected by the emergence of the antimicrobial resistance phenomenon, leading to increased morbidity and mortality worldwide. Multidrug-resistant pathogens are found not only in hospital settings, but also in the community, and are considered one of the biggest public health concerns. The main mechanisms by which bacteria develop resistance to antibiotics include changes in the drug target, prevention of entering the cell, elimination through efflux pumps or inactivation of drugs. A better understanding and prediction of resistance patterns of a pathogen will lead to a better selection of active antibiotics for the treatment of multidrug-resistant infections.
Collapse
|
7
|
Antimicrobial Susceptibility and Clinical Findings of Anaerobic Bacteria. Antibiotics (Basel) 2022; 11:antibiotics11030351. [PMID: 35326814 PMCID: PMC8944802 DOI: 10.3390/antibiotics11030351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Accepted: 03/01/2022] [Indexed: 11/16/2022] Open
|
8
|
Guérin F, Dejoies L, Degand N, Guet-Revillet H, Janvier F, Corvec S, Barraud O, Guillard T, Walewski V, Gallois E, Cattoir V. In Vitro Antimicrobial Susceptibility Profiles of Gram-Positive Anaerobic Cocci Responsible for Human Invasive Infections. Microorganisms 2021; 9:microorganisms9081665. [PMID: 34442745 PMCID: PMC8398781 DOI: 10.3390/microorganisms9081665] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Revised: 07/29/2021] [Accepted: 07/30/2021] [Indexed: 12/14/2022] Open
Abstract
The aim of this multicentre study was to determine the in vitro susceptibility to anti-anaerobic antibiotics of Gram-positive anaerobic cocci (GPAC) isolates responsible for invasive infections in humans. A total of 133 GPAC isolates were collected in nine French hospitals from 2016 to 2020. All strains were identified to the species level (MALDI-TOF mass spectrometry, 16S rRNA sequencing). Minimum inhibitory concentrations (MICs) of amoxicillin, piperacillin, cefotaxime, imipenem, clindamycin, vancomycin, linezolid, moxifloxacin, rifampicin, and metronidazole were determined by the reference agar dilution method. Main erm-like genes were detected by PCR. The 133 GPAC isolates were identified as follows: 10 Anaerococcus spp., 49 Finegoldia magna, 33 Parvimonas micra, 30 Peptoniphilus spp., and 11 Peptostreptococcus anaerobius. All isolates were susceptible to imipenem, vancomycin (except 3 P. micra), linezolid and metronidazole. All isolates were susceptible to amoxicillin and piperacillin, except for P. anaerobius (54% and 45% susceptibility only, respectively). MICs of cefotaxime widely varied while activity of rifampicin, and moxifloxacin was also variable. Concerning clindamycin, 31 were categorized as resistant (22 erm(A) subclass erm(TR), 7 erm(B), 1 both genes and 1 negative for tested erm genes) with MICs from 8 to >32 mg/L. Although GPACs are usually susceptible to drugs commonly used for the treatment of anaerobic infections, antimicrobial susceptibility should be evaluated in vitro.
Collapse
Affiliation(s)
- François Guérin
- Service de Bactériologie-Hygiène Hospitalière, CHU de Rennes, F-35033 Rennes, France; (F.G.); (L.D.)
| | - Loren Dejoies
- Service de Bactériologie-Hygiène Hospitalière, CHU de Rennes, F-35033 Rennes, France; (F.G.); (L.D.)
| | - Nicolas Degand
- Laboratoire de Bactériologie, CHU de Nice, F-06202 Nice, France;
| | | | - Frédéric Janvier
- Service de Microbiologie et Hygiène Hospitalière, Hôpital d’Instruction des Armées Saint-Anne, F-83800 Toulon, France;
| | - Stéphane Corvec
- Service de Bactériologie et des Contrôles Microbiologiques, CHU de Nantes, F-44093 Nantes, France;
| | - Olivier Barraud
- Laboratoire de Bactériologie-Virologie-Hygiène, CHU Dupuytren, F-87042 Limoges, France;
| | - Thomas Guillard
- Laboratoire de Bactériologie-Virologie-Hygiène Hospitalière, Hôpital Robert Debré-CHU de Reims, F-51090 Reims, France;
| | - Violaine Walewski
- Service de Microbiologie, Hôpitaux Universitaires de Paris Seine Denis (HUPSSD), Site Avicenne, AP-HP, F-93000 Bobigny, France;
| | | | - Vincent Cattoir
- Service de Bactériologie-Hygiène Hospitalière, CHU de Rennes, F-35033 Rennes, France; (F.G.); (L.D.)
- Correspondence: ; Tel.: +33-2-99-28-42-76; Fax: +33-2-99-28-41-59
| | | |
Collapse
|
9
|
Zou Q, Zou H, Shen Y, Yu L, Zhou W, Sheng C, Liao A, Li C. Pathogenic Spectrum and Resistance Pattern of Bloodstream Infections Isolated from Postpartum Women: A Multicenter Retrospective Study. Infect Drug Resist 2021; 14:2387-2395. [PMID: 34211283 PMCID: PMC8241814 DOI: 10.2147/idr.s315367] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 06/15/2021] [Indexed: 11/30/2022] Open
Abstract
PURPOSE Bloodstream infections (BSIs) cause morbidity and mortality in postpartum patients, resulting in poor prognosis for both mother and neonate. Gram-negative bacteremia is a public health threat, with high mortality among vulnerable populations and significant global economic costs. Gram-negative bacteremia and antimicrobial resistance are increasing. This study retrospectively analyzed the pathogen distribution and drug sensitivity among postpartum patients with BSIs to identify appropriate antibacterial agents for perioperative therapy. MATERIAL AND METHODS All bacteremia cases between January 2015 and December 2020 from three Health Centers for Women and Children in Chongqing, China, were retrospectively reviewed. Clinical data were collected from medical records and charts. Blood samples were cultured by BD BACTEC FX200. Bacterial and fungal species and bacterial susceptibility were identified by a BD PhoenixTM M50 automatic detection machine. RESULTS In total, 274 pathogenic strains were isolated from 272 blood samples. Excluding 25 suspected contamination strains, 248 blood samples yielded 249 microorganisms, including 214 gram-negative bacteria (85.9%), 34 gram-positive bacteria (13.6%), and 1 fungus (0.5%). Escherichia coli (E. coli) was the most frequently isolated pathogen, both overall and among gram-negative bacilli (73.5%). Streptococcus agalactiae represented 3.6% of gram-positive cocci (n = 9). Laboratory-confirmed anaerobic infections comprised 9.2% of cases (n = 23). Additionally, 47.4% of postpartum patients with BSIs suffered premature rupture of membranes (PROM), a suspected infection risk factor. Drug sensitivity levels remained unchanged for less commonly used drugs, but resistance increased against commonly used drugs. Specifically, E. coli resistance against fourth-generation cephalosporins increased during this study period. CONCLUSION E. coli is the most common gram-negative bacillus in postpartum patients with BSIs, and increased anaerobic bacterial detections suggest genital tract inflammation control before delivery is necessary. Effective drug resistance monitoring remains necessary to alleviate bacterial resistance, such as preventing inappropriate antibiotic applications.
Collapse
Affiliation(s)
- Qin Zou
- Department of Laboratory Medicine, Chongqing Health Center for Women and Children, Chongqing, People’s Republic of China
| | - Hua Zou
- Department of Laboratory Medicine, Chongqing Health Center for Women and Children, Chongqing, People’s Republic of China
| | - Yan Shen
- Department of Laboratory Medicine, Chongqing Health Center for Women and Children, Chongqing, People’s Republic of China
| | - Lang Yu
- Department of Laboratory Medicine, Chongqing Health Center for Women and Children, Chongqing, People’s Republic of China
| | - Wei Zhou
- Department of Obstetrics and Gynecology, Chongqing Health Center for Women and Children, Chongqing, People’s Republic of China
| | - Chenglin Sheng
- Department of Laboratory Medicine, Wanzhou Health Center for Women and Children, Chongqing, People’s Republic of China
| | - Ang Liao
- Department of Laboratory Medicine, Yongchuan Health Center for Women and Children, Chongqing, People’s Republic of China
| | - Chunli Li
- Department of Laboratory Medicine, Chongqing Health Center for Women and Children, Chongqing, People’s Republic of China
| |
Collapse
|
10
|
Antimicrobial Susceptibility Patterns and Wild-Type MIC Distributions of Anaerobic Bacteria at a German University Hospital: A Five-Year Retrospective Study (2015-2019). Antibiotics (Basel) 2020; 9:antibiotics9110823. [PMID: 33217968 PMCID: PMC7698766 DOI: 10.3390/antibiotics9110823] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 11/11/2020] [Accepted: 11/16/2020] [Indexed: 12/23/2022] Open
Abstract
Local antimicrobial susceptibility surveys are crucial for optimal empirical therapy guidelines and for aiding in antibiotic stewardship and treatment decisions. For many laboratories, a comprehensive overview of local antimicrobial susceptibility patterns of anaerobic bacteria is still lacking due to the long incubation time and effort involved. The present study investigates the antimicrobial susceptibility patterns and related clinical and demographic data of 2856 clinical isolates of anaerobic bacteria that were submitted for analysis to the Institute for Medical Microbiology and Hygiene of the Freiburg University Medical Center (a tertiary university medical center in Southern Germany) between 2015 and 2019. Antimicrobial susceptibility testing has been carried out according to the European Committee on Antimicrobial Susceptibility Testing (EUCAST) guideline. Minimum inhibitory concentration (MIC)50 and MIC90 for penicillin, metronidazole, moxifloxacin, and clindamycin were established for Gram-positive anaerobes and for ampicillin-sulbactam, meropenem, metronidazole, moxifloxacin, and clindamycin for Gram-negative anaerobes. The distribution of MIC-values for various antibiotics against anaerobic bacteria was also established, especially for those having no specific breakpoints according to EUCAST guidelines. Most clinically relevant anaerobic bacteria originated from general surgery, neurological, and orthopedic wards. A high proportion of isolates were resistant to moxifloxacin and clindamycin indicating the importance of their susceptibility testing before administration. Based on our study metronidazole and other β-lactam/β-lactamase inhibitor combinations such as ampicillin-sulbactam remain suitable for empirical treatment of infections with anaerobic bacteria.
Collapse
|