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Hindy JR, Quintero-Martinez JA, Lee AT, Scott CG, Gerberi DJ, Mahmood M, DeSimone DC, Baddour LM. Incidence Trends and Epidemiology of Staphylococcus aureus Bacteremia: A Systematic Review of Population-Based Studies. Cureus 2022; 14:e25460. [PMID: 35774691 PMCID: PMC9239286 DOI: 10.7759/cureus.25460] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/29/2022] [Indexed: 11/06/2022] Open
Abstract
Objectives: To determine incidence trends of Staphylococcus aureus bacteremia (SAB) from population-based studies from multiple countries. Methods: A contemporary systematic review was conducted using Ovid Cochrane Central Register of Controlled Trials (1991+), Ovid Embase (1974+), Ovid Medical Literature Analysis and Retrieval System Online (MEDLINE) (1946+ including epub ahead of print, in-process & other non-indexed citations), and Web of Science Core Collection (Science Citation Index Expanded 1975+ and Emerging Sources Citation Index 2015+). Two authors (J.R.H. and J.A.Q.M.) independently reviewed all studies and included those that reported population-based incidence of SAB in patients aged 18 years and older. Results: Twenty-six studies met inclusion criteria with the highest number (n=6) of studies conducted in Canada. The incidence of SAB ranged from 9.3 to 65 cases/100,000/year. The median age of patients with SAB ranged from 62 to 72 years and SAB cases were more commonly observed in men than in women. The most common infection sources were intravascular catheters and skin and soft tissue infections. SAB incidence trends demonstrated high variability for geographic regions and calendar years. Overall, there was no change in the incidence trend across all studies during the past two decades. Conclusion: Multiple factors, both pros, and cons are likely responsible for the overall stable SAB incidence in countries included in this systematic review. Some of these factors vary in geographic location and prompt additional investigations from countries not included in the current review so that a more global characterization is defined.
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Pasman R, Krom BP, Zaat SAJ, Brul S. The Role of the Oral Immune System in Oropharyngeal Candidiasis-Facilitated Invasion and Dissemination of Staphylococcus aureus. FRONTIERS IN ORAL HEALTH 2022; 3:851786. [PMID: 35464779 PMCID: PMC9021398 DOI: 10.3389/froh.2022.851786] [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: 01/10/2022] [Accepted: 02/25/2022] [Indexed: 11/13/2022] Open
Abstract
Candida albicans and Staphylococcus aureus account for most invasive fungal and bacterial bloodstream infections (BSIs), respectively. However, the initial point of invasion responsible for S. aureus BSIs is often unclear. Recently, C. albicans has been proposed to mediate S. aureus invasion of immunocompromised hosts during co-colonization of oral mucosal surfaces. The status of the oral immune system crucially contributes to this process in two distinct ways: firstly, by allowing invasive C. albicans growth during dysfunction of extra-epithelial immunity, and secondly following invasion by some remaining function of intra-epithelial immunity. Immunocompromised individuals at risk of developing invasive oral C. albicans infections could, therefore, also be at risk of contracting concordant S. aureus BSIs. Considering the crucial contribution of both oral immune function and dysfunction, the aim of this review is to provide an overview of relevant aspects of intra and extra-epithelial oral immunity and discuss predominant immune deficiencies expected to facilitate C. albicans induced S. aureus BSIs.
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Affiliation(s)
- Raymond Pasman
- Department of Molecular Biology and Microbial Food Safety, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Bastiaan P. Krom
- Department of Preventive Dentistry, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Sebastian A. J. Zaat
- Department of Medical Microbiology and Infection Prevention, Amsterdam UMC, University of Amsterdam, Amsterdam Institute for Infection and Immunity, Amsterdam, Netherlands
| | - Stanley Brul
- Department of Molecular Biology and Microbial Food Safety, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, Netherlands
- *Correspondence: Stanley Brul
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Davy-Mendez T, Napravnik S, Hogan BC, Althoff KN, Gebo KA, Moore RD, Horberg MA, Silverberg MJ, Gill MJ, Crane HM, Marconi VC, Bosch RJ, Colasanti JA, Sterling TR, Mathews WC, Mayor AM, Nanditha NGA, Buchacz K, Li J, Rebeiro PF, Thorne JE, Nijhawan A, van Duin D, Wohl DA, Eron JJ, Berry SA. Hospitalization Rates and Causes Among Persons With HIV in the United States and Canada, 2005-2015. J Infect Dis 2020; 223:2113-2123. [PMID: 33084891 DOI: 10.1093/infdis/jiaa661] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Accepted: 10/15/2020] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND To assess the possible impact of antiretroviral therapy improvements, aging, and comorbidities, we examined trends in all-cause and cause-specific hospitalization rates among persons with HIV (PWH) from 2005 to 2015. METHODS In 6 clinical cohorts, we followed PWH in care (≥1 outpatient CD4 count or HIV load [VL] every 12 months) and categorized ICD codes of primary discharge diagnoses using modified Clinical Classifications Software. Poisson regression estimated hospitalization rate ratios for calendar time trends, adjusted for demographics, HIV risk factor, and annually updated age, CD4, and VL. RESULTS Among 28 057 patients (125 724 person-years), from 2005 to 2015, the median CD4 increased from 389 to 580 cells/µL and virologic suppression from 55% to 85% of patients. Unadjusted all-cause hospitalization rates decreased from 22.3 per 100 person-years in 2005 (95% confidence interval [CI], 20.6-24.1) to 13.0 in 2015 (95% CI, 12.2-14.0). Unadjusted rates decreased for almost all diagnostic categories. Adjusted rates decreased for all-cause, cardiovascular, and AIDS-defining conditions, increased for non-AIDS-defining infection, and were stable for most other categories. CONCLUSIONS Among PWH with increasing CD4 counts and viral suppression, unadjusted hospitalization rates decreased for all-cause and most cause-specific hospitalizations, despite the potential effects of aging, comorbidities, and cumulative exposure to HIV and antiretrovirals.
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Affiliation(s)
- Thibaut Davy-Mendez
- Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.,School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Sonia Napravnik
- Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.,School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Brenna C Hogan
- Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA
| | - Keri N Althoff
- Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA.,School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Kelly A Gebo
- Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA.,School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Richard D Moore
- Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA.,School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Michael A Horberg
- Kaiser Permanente Mid-Atlantic Permanente Research Institute, Rockville, Maryland, USA
| | | | - M John Gill
- Southern Alberta HIV Clinic, Calgary, Alberta, Canada
| | - Heidi M Crane
- School of Medicine, University of Washington, Seattle, Washington, USA
| | | | - Ronald J Bosch
- T. H. Chan School of Public Health, Harvard University, Boston, Massachusetts, USA
| | | | | | | | - Angel M Mayor
- School of Medicine, Universidad Central del Caribe, Bayamon, Puerto Rico, USA
| | - Ni Gusti Ayu Nanditha
- Faculty of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | - Kate Buchacz
- Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Jun Li
- Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Peter F Rebeiro
- School of Medicine, Vanderbilt University, Nashville, Tennessee, USA
| | - Jennifer E Thorne
- School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Ank Nijhawan
- University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - David van Duin
- School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - David A Wohl
- Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.,School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Joseph J Eron
- Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.,School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Stephen A Berry
- School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
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Regina Pedrosa Soares C, de Lira CR, Cunha MAH, Romão de Souza Junior V, Lopes de Melo F, de Araújo PSR, Maciel MAV. Prevalence of nasal colonization by methicillin-resistant Staphylococcus aureus in outpatients living with HIV/AIDS in a Referential Hospital of the Northeast of Brazil. BMC Res Notes 2018; 11:794. [PMID: 30400979 PMCID: PMC6219150 DOI: 10.1186/s13104-018-3899-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2018] [Accepted: 10/30/2018] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVE The purpose of this study is to investigate the prevalence of MRSA among people living with HIV/AIDS (PLHA) being monitored in a tertiary outpatient hospital in the state of Pernambuco, in the Brazilian Northeast. RESULTS Staphylococcus aureus was isolated from a nasal swab and found in 31.4% of the individuals (95% CI 27.3-35.5), of whom 4.4% (95% CI 8.5-19.5) were MRSA, as confirmed by the presence of the mecA gene. For individuals whose S. aureus was recovered, the mean age was 41.5 years; 93.6% were on antiretroviral treatment. This group had CD4 cell counts > 200 (92%) and viral load ≤ 100 copies (79.1%). Use of antimicrobial agents in the past 12 months was found among 21% of the individuals, and 24.2% reported use of illicit drugs at lease once in their lifetime. Prevalence of nasal colonization by MSSA (26.7%) and MRSA (4.4%) was higher in comparison to other studies of this population; nevertheless, we were unable to establish factors associated with risk.
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Affiliation(s)
- Cynthia Regina Pedrosa Soares
- Department of Tropical Medicine, Federal University of Pernambuco, Av. Prof. Moraes Rego 1235, 5067-0901, Recife, Brazil
| | - Celso Rodrigues de Lira
- Fundação Oswaldo Cruz-Fiocruz, Instituto Ageu Magalhaes, Avenida Professor Moraes Rego, s/n Cidade Universitaria, Recife, 50670-420, PE, Brazil
| | - Maximiliano Alexandre H Cunha
- Department of Tropical Medicine, Federal University of Pernambuco, Av. Prof. Moraes Rego 1235, 5067-0901, Recife, Brazil
| | - Valter Romão de Souza Junior
- Department of Tropical Medicine, Federal University of Pernambuco, Av. Prof. Moraes Rego 1235, 5067-0901, Recife, Brazil. .,Universidade Federal de Pernambuco, Av. Prof. Moraes Rego 1235, 5067-0901, Recife, Pernambuco, Brazil.
| | - Fábio Lopes de Melo
- Fundação Oswaldo Cruz-Fiocruz, Instituto Ageu Magalhaes, Avenida Professor Moraes Rego, s/n Cidade Universitaria, Recife, 50670-420, PE, Brazil
| | - Paulo Sergio Ramos de Araújo
- Department of Tropical Medicine, Federal University of Pernambuco, Av. Prof. Moraes Rego 1235, 5067-0901, Recife, Brazil.,Fundação Oswaldo Cruz-Fiocruz, Instituto Ageu Magalhaes, Avenida Professor Moraes Rego, s/n Cidade Universitaria, Recife, 50670-420, PE, Brazil
| | - Maria Amélia Vieira Maciel
- Department of Tropical Medicine, Federal University of Pernambuco, Av. Prof. Moraes Rego 1235, 5067-0901, Recife, Brazil
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Tong SYC, Davis JS, Eichenberger E, Holland TL, Fowler VG. Staphylococcus aureus infections: epidemiology, pathophysiology, clinical manifestations, and management. Clin Microbiol Rev 2015; 28:603-61. [PMID: 26016486 PMCID: PMC4451395 DOI: 10.1128/cmr.00134-14] [Citation(s) in RCA: 2701] [Impact Index Per Article: 300.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Staphylococcus aureus is a major human pathogen that causes a wide range of clinical infections. It is a leading cause of bacteremia and infective endocarditis as well as osteoarticular, skin and soft tissue, pleuropulmonary, and device-related infections. This review comprehensively covers the epidemiology, pathophysiology, clinical manifestations, and management of each of these clinical entities. The past 2 decades have witnessed two clear shifts in the epidemiology of S. aureus infections: first, a growing number of health care-associated infections, particularly seen in infective endocarditis and prosthetic device infections, and second, an epidemic of community-associated skin and soft tissue infections driven by strains with certain virulence factors and resistance to β-lactam antibiotics. In reviewing the literature to support management strategies for these clinical manifestations, we also highlight the paucity of high-quality evidence for many key clinical questions.
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Affiliation(s)
- Steven Y C Tong
- Global and Tropical Health, Menzies School of Health Research, Darwin, Northern Territory, Australia
| | - Joshua S Davis
- Global and Tropical Health, Menzies School of Health Research, Darwin, Northern Territory, Australia
| | - Emily Eichenberger
- Division of Infectious Diseases, Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA
| | - Thomas L Holland
- Division of Infectious Diseases, Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA
| | - Vance G Fowler
- Division of Infectious Diseases, Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA Duke Clinical Research Institute, Duke University Medical Center, Durham, North Carolina, USA
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Risk and prognosis of Staphylococcus aureus bacteremia among individuals with and without end-stage renal disease: a Danish, population-based cohort study. BMC Infect Dis 2015; 15:6. [PMID: 25566857 PMCID: PMC4296555 DOI: 10.1186/s12879-014-0740-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Accepted: 12/23/2014] [Indexed: 01/16/2023] Open
Abstract
Background Staphylococcus aureus is a leading cause of bloodstream infections among hemodialysis patients and of exit-site infections among peritoneal dialysis patients. However, the risk and prognosis of Staphylococcus aureus bacteremia among end-stage renal disease patients have not been delineated. Methods In this Danish nationwide, population-based cohort study patients with end-stage renal disease and matched population controls were observed from end-stage renal disease diagnosis/sampling until first episode of Staphylococcus aureus bacteremia, death, or end of study period. Staphylococcus aureus positive blood cultures, hospitalization, comorbidity, and case fatality were obtained from nationwide microbiological, clinical, and administrative databases. Incidence rates and risk factors were assessed by regression analysis. Results The incidence rate of Staphylococcus aureus bacteremia was very high for end-stage renal disease patients (35.7 per 1,000 person-years; 95% CI, 33.8-37.6) compared to population controls (0.5 per 1,000 person-years; 95% CI, 0.5-0.6), yielding a relative risk of 65.1 (95% CI, 59.6-71.2) which fell to 28.6 (95% CI, 23.3-35.3) after adjustment for sex, age, and comorbidity. After stratification for type of renal replacement therapy, we found the highest incidence rate of Staphylococcus aureus bacteremia among hemodialysis patients (46.3 per 1,000 person-years) compared to peritoneal dialysis patients (22.0 per 1,000 person-years) and renal transplant recipients (8.9 per 1,000 person-years). In persons with Staphylococcus aureus bacteremia, ninety-day case fatality was 18.2% (95% CI, 16.2%-20.3%) for end-stage renal disease patients and 33.7% (95% CI, 30.3-37.3) for population controls. Conclusions Patients with end-stage renal disease, and hemodialysis patients in particular, have greatly increased risk of Staphylococcus aureus bacteremia compared to population controls. Future challenges will be to develop strategies to reduce Staphylococcus aureus bacteremia-related morbidity and death in this high-risk population. Electronic supplementary material The online version of this article (doi:10.1186/s12879-014-0740-8) contains supplementary material, which is available to authorized users.
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Stammler Jaliff B, Dahl-Knudsen J, Petersen A, Skov R, Benfield T. Outcome and reinfection after Staphylococcus aureus bacteraemia in individuals with and without HIV-1 infection: a case-control study. BMJ Open 2014; 4:e004075. [PMID: 24760348 PMCID: PMC4010819 DOI: 10.1136/bmjopen-2013-004075] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
OBJECTIVES Individuals infected with HIV-1 are at an increased risk of Staphylococcus aureus bacteraemia (SAB). The aim of this study was to investigate mortality rate and risk of reinfection associated with SAB in HIV-1-infected individuals compared to individuals without HIV-1 infection. SETTING University hospital treating a third of the estimated 5000 individuals with HIV infection in Denmark. PARTICIPANTS HIV-1-infected (n=82) and sex-matched and age-matched uninfected (n=163) individuals with SAB in the time period 1 January 1995 to 31 December 2010. PRIMARY OUTCOME MEASURES 30-day and 365-day mortality rate ratio and relative risk of reinfection. RESULTS Individuals with HIV had an increased risk of death at day 30 (OR 11.90 (95% CI 2.15 to 65.85)) compared to individuals without HIV. Other factors associated with mortality were age, a foreign device and Pitt score. HIV-related factors did not associate to mortality. During follow-up, there were 43 episodes of reinfection; in individuals with HIV infection at an incidence rate of 7.8 (95% CI 4.7 to 10.9)/100 person-years compared with 2.2 (95% CI 1.2 to 3.2)/100 person-years for individuals without HIV. In multivariate analysis, HIV status (OR 2.91 (95% CI 1.29 to 6.58) and injection drug use (OR 3.51 (95% CI 1.06 to 11.63) were independently associated with an increased risk of reinfection. CONCLUSIONS HIV-1 infection is associated with an increased risk of 30-day mortality after SAB and a very high rate of reinfection. Age, a foreign device and Pitt score predicted outcome. For patients infected with HIV, neither CD4 T-lymphocyte counts nor plasma HIV RNA levels were associated with 30-day outcome. TRIAL REGISTRATION NUMBER The study was approved by the Danish Data Protection Agency (record no. 2007-41-1196).
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Affiliation(s)
- Bianca Stammler Jaliff
- Department of Infectious Diseases, Hvidovre Hospital, University of Copenhagen, Hvidovre, Denmark
- Department of Infectious Diseases, Karolinska University Hospital, Stockholm, Sweden
| | - Jenny Dahl-Knudsen
- Department of Clinical Microbiology, Hvidovre Hospital, University of Copenhagen, Hvidovre, Denmark
| | | | | | - Thomas Benfield
- Department of Infectious Diseases, Hvidovre Hospital, University of Copenhagen, Hvidovre, Denmark
- Clinical Research Centre, Hvidovre Hospital, University of Copenhagen, Hvidovre, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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Wiese L, Mejer N, Schønheyder HC, Westh H, Jensen AG, Larsen AR, Skov R, Benfield T. A nationwide study of comorbidity and risk of reinfection after Staphylococcus aureus bacteraemia. J Infect 2013; 67:199-205. [PMID: 23664855 DOI: 10.1016/j.jinf.2013.04.018] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2012] [Revised: 04/16/2013] [Accepted: 04/20/2013] [Indexed: 12/14/2022]
Abstract
BACKGROUND Data on risk factors and rates of reinfection associated with Staphylococcus aureus bacteraemia (SAB) are sparse. METHODS We conducted a nationwide cohort study of cases of SAB diagnosed between 1995 and 2008. Reinfection was defined as an episode of SAB more than 90 days after the initial episode of SAB. Comorbidity was evaluated by the Charlson Comorbidity Index (CCI). Cox proportional hazards modelling was used to estimate hazard rates (HR). RESULTS Of 10,891 eligible patients, 774 (7.1%) experienced reinfection a median of 458 days (range 90-5021 days) after their primary SAB episode corresponding to a reinfection rate of 1459 (95% confidence interval (CI): 1357-1562) per 100,000 personyears. In multivariate analysis, sex, origin, a vascular or peritoneal device, endocarditis and comorbidity were associated with reinfection. The association was more than two-fold higher among patients in dialysis and for patients with severe comorbidity (CCI ≥ 2). HIV infection (Hazard ratio (HR) 6.18, 95% CI: 4.17-9.16), renal disease (HR 3.92, 95% CI: 3.22-4.78), diabetes with complications (HR 2.11, 95% CI: 1.69-2.62), diabetes without complications (HR 1.61, 95% CI: 1.34-1.93), mild (HR: 1.94, 95% CI: 1.36-2.76) and severe liver disease (HR 2.08, 95% CI: 1.08-4.03), peptic ulcer (HR 1.33, 95% CI: 1.03-1.72), and paraplegia (HR 2.15, 95% CI: 1.02-4.54) were each associated with an increased risk of reinfection. CONCLUSIONS Patients with previous SAB have a 60-fold higher risk of SAB compared to the general population. Patients with HIV infection, renal disease, diabetes, liver disease, peptic ulcer and paraplegia had the highest rates of reinfection.
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Affiliation(s)
- L Wiese
- Department of Infectious Diseases, Copenhagen University Hospital, Hvidovre, Denmark.
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van Hal SJ, Jensen SO, Vaska VL, Espedido BA, Paterson DL, Gosbell IB. Predictors of mortality in Staphylococcus aureus Bacteremia. Clin Microbiol Rev 2012; 25:362-86. [PMID: 22491776 PMCID: PMC3346297 DOI: 10.1128/cmr.05022-11] [Citation(s) in RCA: 623] [Impact Index Per Article: 51.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Staphylococcus aureus bacteremia (SAB) is an important infection with an incidence rate ranging from 20 to 50 cases/100,000 population per year. Between 10% and 30% of these patients will die from SAB. Comparatively, this accounts for a greater number of deaths than for AIDS, tuberculosis, and viral hepatitis combined. Multiple factors influence outcomes for SAB patients. The most consistent predictor of mortality is age, with older patients being twice as likely to die. Except for the presence of comorbidities, the impacts of other host factors, including gender, ethnicity, socioeconomic status, and immune status, are unclear. Pathogen-host interactions, especially the presence of shock and the source of SAB, are strong predictors of outcomes. Although antibiotic resistance may be associated with increased mortality, questions remain as to whether this reflects pathogen-specific factors or poorer responses to antibiotic therapy, namely, vancomycin. Optimal management relies on starting appropriate antibiotics in a timely fashion, resulting in improved outcomes for certain patient subgroups. The roles of surgery and infectious disease consultations require further study. Although the rate of mortality from SAB is declining, it remains high. Future international collaborative studies are required to tease out the relative contributions of various factors to mortality, which would enable the optimization of SAB management and patient outcomes.
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Affiliation(s)
- Sebastian J van Hal
- Department of Microbiology and Infectious Diseases, Sydney South West Pathology Service—Liverpool, South Western Sydney Local Health Network, Sydney, New South Wales, Australia.
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