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Huemer M, Mairpady Shambat S, Hertegonne S, Bergada-Pijuan J, Chang CC, Pereira S, Gómez-Mejia A, Van Gestel L, Bär J, Vulin C, Pfammatter S, Stinear TP, Monk IR, Dworkin J, Zinkernagel AS. Serine-threonine phosphoregulation by PknB and Stp contributes to quiescence and antibiotic tolerance in Staphylococcus aureus. Sci Signal 2023; 16:eabj8194. [PMID: 36595572 DOI: 10.1126/scisignal.abj8194] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 12/06/2022] [Indexed: 01/05/2023]
Abstract
Staphylococcus aureus can cause infections that are often chronic and difficult to treat, even when the bacteria are not antibiotic resistant because most antibiotics act only on metabolically active cells. Subpopulations of persister cells are metabolically quiescent, a state associated with delayed growth, reduced protein synthesis, and increased tolerance to antibiotics. Serine-threonine kinases and phosphatases similar to those found in eukaryotes can fine-tune essential bacterial cellular processes, such as metabolism and stress signaling. We found that acid stress-mimicking conditions that S. aureus experiences in host tissues delayed growth, globally altered the serine and threonine phosphoproteome, and increased threonine phosphorylation of the activation loop of the serine-threonine protein kinase B (PknB). The deletion of stp, which encodes the only annotated functional serine-threonine phosphatase in S. aureus, increased the growth delay and phenotypic heterogeneity under different stress challenges, including growth in acidic conditions, the intracellular milieu of human cells, and abscesses in mice. This growth delay was associated with reduced protein translation and intracellular ATP concentrations and increased antibiotic tolerance. Using phosphopeptide enrichment and mass spectrometry-based proteomics, we identified targets of serine-threonine phosphorylation that may regulate bacterial growth and metabolism. Together, our findings highlight the importance of phosphoregulation in mediating bacterial quiescence and antibiotic tolerance and suggest that targeting PknB or Stp might offer a future therapeutic strategy to prevent persister formation during S. aureus infections.
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Affiliation(s)
- Markus Huemer
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Srikanth Mairpady Shambat
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Sanne Hertegonne
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Judith Bergada-Pijuan
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Chun-Chi Chang
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Sandro Pereira
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Alejandro Gómez-Mejia
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Lies Van Gestel
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Julian Bär
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Clément Vulin
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Sibylle Pfammatter
- Functional Genomics Center Zurich, ETH/University of Zurich, Zurich, Switzerland
| | - Timothy P Stinear
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Ian R Monk
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Jonathan Dworkin
- Department of Microbiology and Immunology, College of Physicians and Surgeons, Columbia University, New York, NY, USA
| | - Annelies S Zinkernagel
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
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Gowler CD, Slayton RB, Reddy SC, O’Hagan JJ. Improving mathematical modeling of interventions to prevent healthcare-associated infections by interrupting transmission or pathogens: How common modeling assumptions about colonized individuals impact intervention effectiveness estimates. PLoS One 2022; 17:e0264344. [PMID: 35226689 PMCID: PMC8884501 DOI: 10.1371/journal.pone.0264344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Accepted: 02/08/2022] [Indexed: 12/03/2022] Open
Abstract
Mathematical models are used to gauge the impact of interventions for healthcare-associated infections. As with any analytic method, such models require many assumptions. Two common assumptions are that asymptomatically colonized individuals are more likely to be hospitalized and that they spend longer in the hospital per admission because of their colonization status. These assumptions have no biological basis and could impact the estimated effects of interventions in unintended ways. Therefore, we developed a model of methicillin-resistant Staphylococcus aureus transmission to explicitly evaluate the impact of these assumptions. We found that assuming that asymptomatically colonized individuals were more likely to be admitted to the hospital or spend longer in the hospital than uncolonized individuals biased results compared to a more realistic model that did not make either assumption. Results were heavily biased when estimating the impact of an intervention that directly reduced transmission in a hospital. In contrast, results were moderately biased when estimating the impact of an intervention that decolonized hospital patients. Our findings can inform choices modelers face when constructing models of healthcare-associated infection interventions and thereby improve their validity.
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Affiliation(s)
- Camden D. Gowler
- Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
- Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Rachel B. Slayton
- Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Sujan C. Reddy
- Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Justin J. O’Hagan
- Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
- * E-mail:
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Molecular reprogramming and phenotype switching in Staphylococcus aureus lead to high antibiotic persistence and affect therapy success. Proc Natl Acad Sci U S A 2021; 118:2014920118. [PMID: 33574060 DOI: 10.1073/pnas.2014920118] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Staphylococcus aureus causes invasive infections and easily acquires antibiotic resistance. Even antibiotic-susceptible S. aureus can survive antibiotic therapy and persist, requiring prolonged treatment and surgical interventions. These so-called persisters display an arrested-growth phenotype, tolerate high antibiotic concentrations, and are associated with chronic and recurrent infections. To characterize these persisters, we assessed S. aureus recovered directly from a patient suffering from a persistent infection. We show that host-mediated stress, including acidic pH, abscess environment, and antibiotic exposure promoted persister formation in vitro and in vivo. Multiomics analysis identified molecular changes in S. aureus in response to acid stress leading to an overall virulent population. However, further analysis of a persister-enriched population revealed major molecular reprogramming in persisters, including down-regulation of virulence and cell division and up-regulation of ribosomal proteins, nucleotide-, and amino acid-metabolic pathways, suggesting their requirement to fuel and maintain the persister phenotype and highlighting that persisters are not completely metabolically inactive. Additionally, decreased aconitase activity and ATP levels and accumulation of insoluble proteins involved in transcription, translation, and energy production correlated with persistence in S. aureus, underpinning the molecular mechanisms that drive the persister phenotype. Upon regrowth, these persisters regained their virulence potential and metabolically active phenotype, including reduction of insoluble proteins, exhibiting a reversible state, crucial for recurrent infections. We further show that a targeted antipersister combination therapy using retinoid derivatives and antibiotics significantly reduced lag-phase heterogeneity and persisters in a murine infection model. Our results provide molecular insights into persisters and help explain why persistent S. aureus infections are so difficult to treat.
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Resman F, Thegerström J, Månsson F, Ahl J, Tham J, Riesbeck K. The prevalence, population structure and screening test specificity of penicillin-susceptible Staphylococcus aureus bacteremia isolates in Malmö, Sweden. J Infect 2016; 73:129-35. [PMID: 27265236 DOI: 10.1016/j.jinf.2016.05.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Revised: 05/17/2016] [Accepted: 05/26/2016] [Indexed: 11/16/2022]
Abstract
OBJECTIVES The objectives of this study were to examine the prevalence of penicillin-susceptible bacteremic Staphylococcus aureus in the Malmö area in 2014, to re-evaluate the phenotypic methods of penicillinase detection on these isolates, and to investigate the clonal distribution of penicillin-susceptible isolates. METHODS All non-redundant S. aureus from blood in the Malmö catchment area in southern Sweden 2014 were screened for penicillin susceptibility using PcG 1U disk diffusion, E-test PcG and the nitrocefin test. All isolates screened as likely susceptible were subjected to PCR for detection of penicillinase (blaZ) and spa-typing. RESULTS Almost one out of three bacteremic isolates (80/257; 31.1%) were susceptible to penicillin. All screening methods except for the nitrocefin test alone had a low proportion of isolates falsely tested as susceptible, but no method used in the study had perfect specificity compared with PCR. Penicillin-susceptible isolates had a distinct phylogenetic distribution, and two clonal complexes (CC5 and CC45) constituted half of the isolates. CONCLUSION Almost one third of S. aureus isolated from blood in southern Sweden in 2014 was susceptible to penicillin. Considering that intravenous penicillin has theoretical advantages compared with the standard treatment in the study area, we argue that routine testing of penicillin susceptibility should be reconsidered.
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Affiliation(s)
- Fredrik Resman
- Infectious Diseases Unit, Department of Clinical Sciences, Lund University, Malmö, Sweden; Riesbeck Lab, Clinical Microbiology, Department of Translational Medicine, Lund University, Malmö, Sweden.
| | - John Thegerström
- Riesbeck Lab, Clinical Microbiology, Department of Translational Medicine, Lund University, Malmö, Sweden
| | - Fredrik Månsson
- Infectious Diseases Unit, Department of Clinical Sciences, Lund University, Malmö, Sweden
| | - Jonas Ahl
- Infectious Diseases Unit, Department of Clinical Sciences, Lund University, Malmö, Sweden; Riesbeck Lab, Clinical Microbiology, Department of Translational Medicine, Lund University, Malmö, Sweden
| | - Johan Tham
- Infectious Diseases Unit, Department of Clinical Sciences, Lund University, Malmö, Sweden; Riesbeck Lab, Clinical Microbiology, Department of Translational Medicine, Lund University, Malmö, Sweden
| | - Kristian Riesbeck
- Riesbeck Lab, Clinical Microbiology, Department of Translational Medicine, Lund University, Malmö, Sweden
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Gao W, Zhang Y, Zhang Q, Zhang L. Nanoparticle-Hydrogel: A Hybrid Biomaterial System for Localized Drug Delivery. Ann Biomed Eng 2016; 44:2049-61. [PMID: 26951462 DOI: 10.1007/s10439-016-1583-9] [Citation(s) in RCA: 140] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2016] [Accepted: 02/26/2016] [Indexed: 12/20/2022]
Abstract
Nanoparticles have offered a unique set of properties for drug delivery including high drug loading capacity, combinatorial delivery, controlled and sustained drug release, prolonged stability and lifetime, and targeted delivery. To further enhance therapeutic index, especially for localized application, nanoparticles have been increasingly combined with hydrogels to form a hybrid biomaterial system for controlled drug delivery. Herein, we review recent progresses in engineering such nanoparticle-hydrogel hybrid system (namely 'NP-gel') with a particular focus on its application for localized drug delivery. Specifically, we highlight four research areas where NP-gel has shown great promises, including (1) passively controlled drug release, (2) stimuli-responsive drug delivery, (3) site-specific drug delivery, and (4) detoxification. Overall, integrating therapeutic nanoparticles with hydrogel technologies creates a unique and robust hybrid biomaterial system that enables effective localized drug delivery.
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Affiliation(s)
- Weiwei Gao
- Department of Nanoengineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Yue Zhang
- Department of Nanoengineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Qiangzhe Zhang
- Department of Nanoengineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Liangfang Zhang
- Department of Nanoengineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA, 92093, USA.
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Wang F, Gao W, Thamphiwatana S, Luk BT, Angsantikul P, Zhang Q, Hu CMJ, Fang RH, Copp JA, Pornpattananangkul D, Lu W, Zhang L. Hydrogel Retaining Toxin-Absorbing Nanosponges for Local Treatment of Methicillin-Resistant Staphylococcus aureus Infection. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:3437-43. [PMID: 25931231 PMCID: PMC4461515 DOI: 10.1002/adma.201501071] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 03/29/2015] [Indexed: 05/02/2023]
Affiliation(s)
- Fei Wang
- Department of NanoEngineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
- Department of Pharmaceutics, School of Pharmacy, Fudan University, and Key Laboratory of Smart Drug Delivery (Fudan University), Ministry of Education, Shanghai 201203, P. R. China
| | - Weiwei Gao
- Department of NanoEngineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Soracha Thamphiwatana
- Department of NanoEngineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Brian T. Luk
- Department of NanoEngineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Pavimol Angsantikul
- Department of NanoEngineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Qiangzhe Zhang
- Department of NanoEngineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Che-Ming J. Hu
- Department of NanoEngineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Ronnie H. Fang
- Department of NanoEngineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Jonathan A. Copp
- Department of NanoEngineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | | | - Weiyue Lu
- Department of Pharmaceutics, School of Pharmacy, Fudan University, and Key Laboratory of Smart Drug Delivery (Fudan University), Ministry of Education, Shanghai 201203, P. R. China
| | - Liangfang Zhang
- Department of NanoEngineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
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Pollack CV, Amin A, Ford WT, Finley R, Kaye KS, Nguyen HH, Rybak MJ, Talan D. Acute bacterial skin and skin structure infections (ABSSSI): practice guidelines for management and care transitions in the emergency department and hospital. J Emerg Med 2015; 48:508-19. [PMID: 25605319 DOI: 10.1016/j.jemermed.2014.12.001] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Revised: 11/30/2014] [Accepted: 12/03/2014] [Indexed: 10/24/2022]
Abstract
BACKGROUND Acute bacterial skin and skin structure infections (ABSSSI), formally referred to as complicated skin and soft tissue infections, include infections with resistance to previously effective antimicrobials. Increasing dramatically in incidence, they have become a challenging medical problem associated with high direct and indirect costs to both the medical system and society. OBJECTIVES To describe the burden of ABSSSI and to explore multidisciplinary approaches to its management and new treatments that can be initiated in the emergency department. DISCUSSION We offer a best practice model aimed at providing risk-stratified and convenient care for ABSSSI at the lowest possible cost, while minimizing complications, readmissions, and inappropriate antibiotic use. In doing so, we focus on the care provided by emergency physicians and hospitalists and the transition of management between them for inpatient care, as well as the facilitation of observation or direct-to-outpatient care for suitable patients. CONCLUSIONS A standard, consistent, and multidisciplinary approach to ABSSSI can streamline care, reduce admissions, support antimicrobial stewardship, and improve clinical and resource consumption outcomes.
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Affiliation(s)
- Charles V Pollack
- Department of Emergency Medicine, Pennsylvania Hospital, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Alpesh Amin
- Hospital Medicine, University of California-Irvine, Orange, California
| | - William T Ford
- Hospital Medicine, Abington Health, Abington, Pennsylvania
| | - Richard Finley
- Department of Emergency Medicine, University of Mississippi Medical Center, Jackson, Mississippi
| | - Keith S Kaye
- Department of Medicine, Wayne State University, Detroit, Michigan; Department of Quality and Patient Safety, Department of Infection Prevention, Hospital Epidemiology and Antibiotic Stewardship, Detroit Medical Center, Detroit, Michigan
| | - Hien H Nguyen
- Division of Infectious Diseases, Department of Internal Medicine, Section of Hospital Medicine, Acute Infections Management Service, UC Davis Medical Center, Sacramento, California
| | - Michael J Rybak
- Department of Pharmacy Practice, Eugene Applebaum College of Pharmacy & Health Sciences, Detroit, Michigan; (Adjunct) Division of Infectious Diseases, Department of Medicine, Wayne State University, Detroit, Michigan
| | - David Talan
- Department of Emergency Medicine and Division of Infectious Diseases, Olive View-UCLA Medical Center, Sylmar, California
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Haleem A, Schultz JS, Heilmann KP, Dohrn CL, Diekema DJ, Gardner SE. Concordance of nasal and diabetic foot ulcer staphylococcal colonization. Diagn Microbiol Infect Dis 2014; 79:85-9. [PMID: 24560808 DOI: 10.1016/j.diagmicrobio.2014.01.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 10/30/2013] [Accepted: 01/12/2014] [Indexed: 12/26/2022]
Abstract
Nasal carriage of Staphylococcus aureus (SA) is an important risk factor for surgical site infections. The goal of this study was to investigate the concordance between nasal and diabetic foot ulcer (DFU) SA carriage. Seventy-nine subjects with DFUs were assessed for nasal and DFU colonization with SA, including methicillin-resistant SA (MRSA). Twenty-five (31.6%) subjects had nares colonization with SA; 29 (36.7%) had DFU colonization with SA. Seven (8.8%) subjects had nares colonization with MRSA, and 7 (8.8%) had DFU colonization with MRSA. Ulcer duration was associated with MRSA presence (P = 0.01). Sensitivity and specificity of positive nasal SA colonization with positive DFU colonization were 41% and 74%. We found substantial discordance between SA strains colonizing DFU and the nasal cavity. The poor positive predictive values for SA isolation in a DFU based on nasal carriage suggests that SA colonization of a DFU by endogenous SA strains cannot be assumed.
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Affiliation(s)
- Ambar Haleem
- Department of Internal Medicine, The University of Iowa, Iowa City, IA, USA
| | | | | | - Cassie L Dohrn
- Carver College of Medicine, The University of Iowa, Iowa City, IA, USA
| | - Daniel J Diekema
- Department of Internal Medicine, The University of Iowa, Iowa City, IA, USA
| | - Sue E Gardner
- College of Nursing, The University of Iowa, Iowa City, IA, USA.
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9
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Curcio D. Resistant pathogen-associated skin and skin-structure infections: antibiotic options. Expert Rev Anti Infect Ther 2014; 8:1019-36. [DOI: 10.1586/eri.10.87] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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10
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Changing epidemiology of methicillin-resistant Staphylococcus aureus colonization in paediatric intensive-care units. Epidemiol Infect 2012. [PMID: 23190509 DOI: 10.1017/s0950268812002476] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Community-associated methicillin-resistant S. aureus (CA-MRSA) accounts for a growing proportion of hospital-onset infections, and colonization is a risk factor. This study aimed to determine changes in the prevalence of CA-MRSA colonization in paediatric intensive-care units (ICUs). A total of 495 paediatric patients colonized with MRSA from neonatal, medical, surgical, and cardiac ICUs between 2001 and 2009 were identified. Isolates were characterized by spa type, staphylococcal cassette chromosome (SCC) mec type and the presence of the genes encoding Panton–Valentine leukocidin (PVL). The proportion of patients colonized with MRSA remained stable (average 3·2%). The proportion of isolates with spa type 1, SCCmec type IV and PVL increased over time to maximums in 2009 of 36·1% (P < 0·001), 54·2% (P = 0·03) and 28·9% (P = 0·003), respectively. Antibiotic susceptibility patterns showed increasing proportions susceptible to clindamycin, gentamicin, tetracycline and trimethoprim-sulfamethoxazole (P values <0·001). In conclusion, the proportion of MRSA-colonized children in ICUs with CA-MRSA increased significantly over time.
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11
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Geographic variability and anti-staphylococcal activity of the chrysophaentins and their synthetic fragments. Mar Drugs 2012; 10:1103-1125. [PMID: 22822360 PMCID: PMC3397459 DOI: 10.3390/md10051103] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2012] [Revised: 05/05/2012] [Accepted: 05/07/2012] [Indexed: 11/16/2022] Open
Abstract
Drug-resistant Staphylococcus aureus is a continuing public health concern, both in the hospital and community settings. Antibacterial compounds that possess novel structural scaffolds and are effective against multiple S. aureus strains, including current drug-resistant ones, are needed. Previously, we have described the chrysophaentins, a family of bisdiarylbutene macrocycles from the chrysophyte alga Chrysophaeum taylori that inhibit the growth of S. aureus and methicillin-resistant S. aureus (MRSA). In this study we have analyzed the geographic variability of chrysophaentin production in C. taylori located at different sites on the island of St. John, U.S. Virgin Islands, and identified two new linear chrysophaentin analogs, E2 and E3. In addition, we have expanded the structure activity relationship through synthesis of fragments comprising conserved portions of the chrysophaentins, and determined the antimicrobial activity of natural chrysophaentins and their synthetic analogs against five diverse S. aureus strains. We find that the chrysophaentins show similar activity against all S. aureus strains, regardless of their drug sensitivity profiles. The synthetic chrysophaentin fragments indeed mimic the natural compounds in their spectrum of antibacterial activity, and therefore represent logical starting points for future medicinal chemistry studies of the natural products and their analogs.
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Diffusion of meticillin-resistant Staphylococcus aureus USA300 strains in central Italy. Int J Antimicrob Agents 2011; 37:339-46. [DOI: 10.1016/j.ijantimicag.2010.12.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2010] [Revised: 09/23/2010] [Accepted: 12/22/2010] [Indexed: 10/18/2022]
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Duffy J, Sievert D, Rebmann C, Kainer M, Lynfield R, Smith P, Fridkin S. Effective state-based surveillance for multidrug-resistant organisms related to health care-associated infections. Public Health Rep 2011; 126:176-85. [PMID: 21387947 DOI: 10.1177/003335491112600208] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
In September 2008, the Council of State and Territorial Epidemiologists and the Centers for Disease Control and Prevention sponsored a meeting of public health and infection-control professionals to address the implementation of surveillance for multidrug-resistant organisms (MDROs)-particularly those related to health care-associated infections. The group discussed the role of health departments and defined goals for future surveillance activities. Participants identified the following main points: (1) surveillance should guide prevention and infection-control activities, (2) an MDRO surveillance system should be adaptable and not organism specific, (3) new systems should utilize and link existing systems, and (4) automated electronic laboratory reporting will be an important component of surveillance but will take time to develop. Current MDRO reporting mandates and surveillance methods vary across states and localities. Health departments that have not already done so should be proactive in determining what type of system, if any, will fit their needs.
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Affiliation(s)
- Jonathan Duffy
- Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA.
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14
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Moellering RC, Abbott GF, Ferraro MJ. Case records of the Massachusetts General Hospital. Case 2-2011. A 30-year-old woman with shock after treatment of a furuncle. N Engl J Med 2011; 364:266-75. [PMID: 21247318 DOI: 10.1056/nejmcpc1003886] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Robert C Moellering
- Division of Infectious Diseases, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, USA
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15
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Microbiological and molecular characterization of nosocomial and community Staphylococcus aureus isolates. Epidemiol Infect 2010; 139:613-22. [PMID: 20561388 DOI: 10.1017/s095026881000138x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
This study aimed to evaluate the incidence of Staphylococcus aureus infections in different departments of Belcolle Hospital in Viterbo and the surrounding area between January 2003 and June 2008. Isolates of methicillin-resistant S. aureus (MRSA) recovered in this time interval were characterized by microbiological and molecular methods to evaluate the reliability of simple criteria to distinguish between hospital-acquired and community-acquired isolates. MRSA accounted for 33% of all S. aureus, with a significantly higher prevalence in isolates from nosocomial infections. MRSA isolates were assayed by PCR for the presence of 13 genes associated with virulence, agr type and SCCmec type. Cumulative data were analysed by partial least square discriminant analysis and a clear correlation was demonstrated between genetic profiles and classification of isolates as hospital or community acquired according to simple temporal criteria. Nosocomial MRSA isolates from blood samples showed significantly higher genetic diversity than other nosocomial isolates. Our data confirm the existence of significant differences between community- and hospital-acquired MRSA isolates.
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Epidemiology of meticillin-resistant Staphylococcus aureus (MRSA) in Latin America. Int J Antimicrob Agents 2009; 34:304-8. [DOI: 10.1016/j.ijantimicag.2009.06.005] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2009] [Accepted: 06/01/2009] [Indexed: 11/22/2022]
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Lindqvist M, Isaksson B, Samuelsson A, Nilsson LE, Hällgren A. A clonal outbreak of methicillin-susceptible Staphylococcus aureus with concomitant resistance to erythromycin, clindamycin and tobramycin in a Swedish county. ACTA ACUST UNITED AC 2009; 41:324-33. [DOI: 10.1080/00365540902801202] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Abstract
Multidrug microbial resistance poses major challenges to the management of infection, particularly with the paucity of new drugs with activity against these bacteria. Since the turn of this century a few new antibiotics have been licensed, including linezolid, daptomycin and tigecycline. This supplement reports data presented at the 13th International Congress of Infectious Diseases held in Kuala Lumpur in June 2008. Dr R. Isturiz reviews the data on global resistance trends and the potential impact on empirical therapy; Dr J.-H. Song reviews new agents on the antimicrobial horizon; and the final paper in the supplement, by Dr L.R. Peterson, reviews the role of tigecycline in the management of complicated intra-abdominal and skin and soft tissue infections.
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Genetic diversity and ecological success of Staphylococcus aureus strains colonizing humans. Appl Environ Microbiol 2008; 75:175-83. [PMID: 18978084 DOI: 10.1128/aem.01860-08] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The genetic determinants and phenotypic traits which make a Staphylococcus aureus strain a successful colonizer are largely unknown. The genetic diversity and population structure of 133 S. aureus isolates from healthy, generally risk-free adult carriers were investigated using four different typing methods: multilocus sequence typing (MLST), amplified fragment length polymorphism analysis (AFLP), double-locus sequence typing (DLST), and spa typing were compared. Carriage isolates displayed great genetic diversity which could only be revealed fully by DLST. Results of AFLP and MLST were highly concordant in the delineation of genotypic clusters of closely related isolates, roughly equivalent to clonal complexes. spa typing and DLST provided considerably less phylogenetic information. The resolution of spa typing was similar to that of AFLP and inferior to that of DLST. AFLP proved to be the most universal method, combining a phylogeny-building capacity similar to that of MLST with a much higher resolution. However, it had a lower reproducibility than sequencing-based MLST, DLST, and spa typing. We found two cases of methicillin-resistant S. aureus colonization, both of which were most likely associated with employment at a health service. Of 21 genotypic clusters detected, 2 were most prevalent: cluster 45 and cluster 30 each colonized 24% of the carrier population. The number of bacteria found in nasal samples varied significantly among the clusters, but the most prevalent clusters were not particularly numerous in the nasal samples. We did not find much evidence that genotypic clusters were associated with different carrier characteristics, such as age, sex, medical conditions, or antibiotic use. This may provide empirical support for the idea that genetic clusters in bacteria are maintained in the absence of adaptation to different niches. Alternatively, carrier characteristics other than those evaluated here or factors other than human hosts may exert selective pressure maintaining genotypic clusters.
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