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Contreras JJ, Díaz A, Beltrán M. Extensive humeral defect secondary to humeral shaft nonunion and chronic osteomyelitis treated with induced membrane technique augmented with fibula autograft: a case report. JSES REVIEWS, REPORTS, AND TECHNIQUES 2021; 1:446-456. [PMID: 37588721 PMCID: PMC10426561 DOI: 10.1016/j.xrrt.2021.08.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 08/18/2023]
Affiliation(s)
- Julio J. Contreras
- Shoulder and Elbow Unit, Instituto Traumatológico, Santiago, Chile
- Department of Orthopedics and Trauma, Universidad de Chile, Santiago, Chile
- Shoulder and Elbow Unit, Pontifical Catholic University of Chile, Santiago, Chile
- Department of Orthopedics and Trauma, Pontifical Catholic University of Chile, Santiago, Chile
| | - Alonso Díaz
- Shoulder and Elbow Unit, Instituto Traumatológico, Santiago, Chile
- Department of Orthopedics and Trauma, Universidad de Chile, Santiago, Chile
| | - Manuel Beltrán
- Shoulder and Elbow Unit, Instituto Traumatológico, Santiago, Chile
- Department of Orthopedics and Trauma, Universidad de Chile, Santiago, Chile
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Verghese VP, Veeraraghavan B, Jayaraman R, Varghese R, Neeravi A, Jayaraman Y, Thomas K, Mehendale SM. Increasing incidence of penicillin- and cefotaxime-resistant Streptococcus pneumoniae causing meningitis in India: Time for revision of treatment guidelines? Indian J Med Microbiol 2018; 35:228-236. [PMID: 28681811 DOI: 10.4103/ijmm.ijmm_17_124] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
PURPOSE Pneumococcal meningitis is a life-threatening infection, requiring prompt diagnosis and effective treatment. Penicillin resistance in pneumococcal infections is a concern. Here, we present the antibiotic susceptibility profile of pneumococcal meningeal isolates from January 2008 to August 2016 to elucidate treatment guidelines for pneumococcal meningitis. MATERIALS AND METHODS Invasive pneumococcal isolates from all age groups, were included in this study. Minimum inhibitory concentrations for the isolates were identified by agar dilution technique and VITEK System 2. Serotyping of isolates was done by co-agglutination technique. RESULTS Out of 830 invasive pneumococcal isolates, 167 (20.1%) isolates were from meningeal infections. Cumulative penicillin resistance in pneumococcal meningitis was 43.7% and cefotaxime non-susceptibility was 14.9%. Penicillin resistance amongst meningeal isolates in those younger than 5 years, 5-16 years of age and those aged 16 years and older was 59.7%, 50% and 27.3%, respectively, with non-susceptibility to cefotaxime in the same age groups being 18%, 22.2% and 10.4%. Penicillin resistance amongst pneumococcal meningeal isolates increased from 9.5% in 2008 to 42.8% in 2016, whereas cefotaxime non-susceptibility increased from 4.7% in 2008 to 28.5% in 2016. Serotypes 14, 19F, 6B, 6A, 23F, 9V and 5 were the most common serotypes causing meningitis, with the first five accounting for over 75% of resistant isolates. CONCLUSIONS The present study reports increasing penicillin resistance and cefotaxime non-susceptibility to pneumococcal meningitis in our setting. This highlights the need for empiric therapy with third-generation cephalosporins and vancomycin for all patients with meningitis while awaiting results of culture and susceptibility testing.
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Affiliation(s)
- Valsan Philip Verghese
- Department of Paediatrics, Christian Medical College and Hospital, Vellore, Tamil Nadu, India
| | - Balaji Veeraraghavan
- Department of Clinical Microbiology, Christian Medical College and Hospital, Vellore, Tamil Nadu, India
| | - Ranjith Jayaraman
- Department of Clinical Microbiology, Christian Medical College and Hospital, Vellore, Tamil Nadu, India
| | - Rosemol Varghese
- Department of Clinical Microbiology, Christian Medical College and Hospital, Vellore, Tamil Nadu, India
| | - Ayyanraj Neeravi
- Department of Clinical Microbiology, Christian Medical College and Hospital, Vellore, Tamil Nadu, India
| | - Yuvaraj Jayaraman
- National Institute of Epidemiology, ICMR, Chennai, Tamil Nadu, India
| | - Kurien Thomas
- Department of General Medicine, Christian Medical College and Hospital, Vellore, Tamil Nadu, India
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Liu Y, Yang Y, Chen Y, Xia Z. Antimicrobial resistance profiles and genotypes of extended-spectrum β-lactamase- and AmpC β-lactamase-producing Klebsiella pneumoniae isolated from dogs in Beijing, China. J Glob Antimicrob Resist 2017; 10:219-222. [DOI: 10.1016/j.jgar.2017.06.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 06/09/2017] [Accepted: 06/09/2017] [Indexed: 11/30/2022] Open
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Pääkkönen M. Septic arthritis in children: diagnosis and treatment. PEDIATRIC HEALTH MEDICINE AND THERAPEUTICS 2017; 8:65-68. [PMID: 29388627 PMCID: PMC5774603 DOI: 10.2147/phmt.s115429] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Acute septic arthritis in children is usually hematogenous. It is more common in boys, and it most often affects the large joints of the lower limb. Diagnosis is based on cultures obtained from the infected joint and is supported by C-reactive protein blood test or ultrasound imaging. Staphylococcus aureus is the most common causative agent and is the primary target for empiric treatment. First-generation cephalosporins and clindamycin are suitable antibiotics. Vancomycin is utilized in areas with high rates of clindamycin- and methicillin-resistant S. aureus. After a short intravenous administration of 2–4 days, a total course of 2 weeks is sufficient in uncomplicated cases. Early antibiotic treatment has significantly improved the prognosis in high-income settings, but uncomplicated recovery is compromised if the treatment is delayed. Complications such as symptomatic osteoarthritis or avascular necrosis of the femoral head develop slowly. A long follow-up of 1–2 years is required to detect all possible sequelae.
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Affiliation(s)
- Markus Pääkkönen
- Department of Pediatric Orthopaedic Surgery.,Department of Hand Surgery, Turku University Hospital and the University of Turku, Turku, Finland
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5
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Antibiotic susceptibility of Streptococcus pneumoniae in healthy carrier children in Murcia (Spain). ANALES DE PEDIATRÍA (ENGLISH EDITION) 2015. [DOI: 10.1016/j.anpede.2015.07.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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6
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Ramirez M. Streptococcus pneumoniae. MOLECULAR MEDICAL MICROBIOLOGY 2015:1529-1546. [DOI: 10.1016/b978-0-12-397169-2.00086-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Alfayate-Miguélez S, Ruiz Gómez J, Sanchez-Solis de Querol M, Guerrero Gómez C, Pérez Simón M, Ortiz Romero MM, Núñez Trigueros ML, López Yepes ML, Blazquez Abellán A, Zarauz García JM, Ruiz Merino G, Ortuño del Moral MP. [Antibiotic susceptibility of Streptococcus pneumoniae in healthy carrier children in Murcia (Spain)]. An Pediatr (Barc) 2014; 83:183-90. [PMID: 25453309 DOI: 10.1016/j.anpedi.2014.10.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Revised: 09/19/2014] [Accepted: 10/02/2014] [Indexed: 10/24/2022] Open
Abstract
INTRODUCTION AND OBJECTIVES Streptococcus pneumoniae (SP) is a human pathogen that involves a high use of antibiotics. The objective of the study was to determine the susceptibility to commonly used antibiotics and their associated risk factors, in order to promote rational use of antibiotics. PATIENTS AND METHODS In A multicentre study was conducted in summer 2009 and winter 2010 on children attending paediatric clinics in the Region of Murcia. A nasopharyngeal sample was collected and an epidemiological questionnaire was completed. The study included 1562 children aged 1 and 4 years old. RESULTS Almost one-third (31.3%, 489/1562) of children were nasal carriers. A sensitivity study was carried out on 376 isolates, of which 343 were serotyped. Almost two-thirds (61.7%, 964/1562) of children had received at least one dose of PCV7 (heptavalent pneumococcal conjugate vaccine), and 12.8% (44/343) of the isolates belonged to PCV7 serotypes. The prevalence rates of penicillin resistance (meningitis infections criteria CMI>0.06mg/L) were 28.1%; however, this percentage was 54% in PCV7 serotypes. None of the isolates had (MIC >2mg/L), so prevalence rates of susceptibility with non-meningitis infections criteria were 100%. There was a high percentage of erythromycin resistance (45.7%). The factors favouring resistance to penicillin and cefotaxime were the consumption of antibiotics in the previous month and the carrying of vaccine serotypes. On the other hand, the age of 4 years old was a protective factor of resistance. The 14, 35B, 19A, 15A, and 19F serotypes were less susceptible to penicillin. CONCLUSIONS Both oral amoxicillin given to outpatients and intravenous penicillin or ampicillin to hospitalized patients are excellent options for the treatment of non-meningeal infections, as seen with pneumonia in these kinds of environments, where there is low incidence of isolates highly resistant to penicillin (CMI ≥ 2mg/L).
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Affiliation(s)
- S Alfayate-Miguélez
- Servicio de Pediatría, Hospital Infantil Universitario Virgen de la Arrixaca, El Palmar, Murcia, España.
| | - J Ruiz Gómez
- Servicio de Microbiología, Hospital Universitario Virgen de la Arrixaca, El Palmar, Murcia, España
| | - M Sanchez-Solis de Querol
- Servicio de Pediatría, Hospital Infantil Universitario Virgen de la Arrixaca, El Palmar, Murcia, España
| | - C Guerrero Gómez
- Servicio de Microbiología, Hospital Universitario Virgen de la Arrixaca, El Palmar, Murcia, España
| | - M Pérez Simón
- Servicio de Microbiología, Hospital Los Arcos-Mar Menor, Santiago de la Ribera, Murcia, España
| | - M M Ortiz Romero
- Servicio de Microbiología, Hospital Santa Lucía, Cartagena Murcia, España
| | | | - M L López Yepes
- Servicio de Microbiología, Hospital Virgen del Castillo, Yecla, Murcia, España
| | - A Blazquez Abellán
- Servicio de Microbiología, Hospital Universitario Virgen de la Arrixaca, El Palmar, Murcia, España
| | - J M Zarauz García
- Servicio de Microbiología, Hospital Rafael Méndez, Lorca, Murcia, España
| | - G Ruiz Merino
- Unidad de Apoyo Metodológico de la Fundación para la Formación e Investigación Sanitarias, Murcia, España
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Abstract
Antimicrobial resistance and serotypes in Streptococcus pneumoniae have been evolving with the widespread use of antibiotics and the introduction of pneumococcal conjugate vaccines (PCV). Particularly, among various types of antimicrobial resistance, macrolide resistance has most remarkably increased in many parts of the world, which has been reported to be >70% among clinical isolates from Asian countries. Penicillin resistance has dramatically decreased among nonmeningeal isolates due to the changes in resistance breakpoints, although resistance to other β-lactams such as cefuroxime has increased. Multidrug resistance became a serious concern in the treatment of invasive pneumococcal diseases, especially in Asian countries. After PCV7 vaccination, serotype 19A has emerged as an important cause of invasive pneumococcal diseases which was also associated with increasing prevalence of multidrug resistance in pneumococci. Widespread use of PCV13, which covers additional serotypes 3, 6A and 19A, may contribute to reduce the clonal spread of drug-resistant 19A pneumococci.
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Affiliation(s)
- Jae-Hoon Song
- Division of Infectious Diseases, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea; Asia Pacific Foundation for Infectious Diseases (APFID), Seoul, Korea . +82 234 100 320 +82 234 100 328
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9
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Penicillin susceptibility breakpoints for Streptococcus pneumoniae and their effect on susceptibility categorisation in Germany (1997–2013). Eur J Clin Microbiol Infect Dis 2014; 33:2035-40. [DOI: 10.1007/s10096-014-2174-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Accepted: 05/29/2014] [Indexed: 10/25/2022]
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10
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Pääkkönen M, Peltola H. Simplifying the treatment of acute bacterial bone and joint infections in children. Expert Rev Anti Infect Ther 2014; 9:1125-31. [DOI: 10.1586/eri.11.140] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Abstract
Pneumococcus is one of the most common bacterial pathogens encountered in medicine. This article summarizes the risk factors, pathogenesis, treatment, and prevention of the spectrum of disease caused by pneumococcus with particular emphasis on antibiotic resistance as well as immunization. This information is useful for physicians caring for patients both as inpatients and outpatients as well as for those concerned with public health and disease prevention.
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Affiliation(s)
- Samuel Y Ash
- Department of Medicine, University of Washington Medical Center, 1959 Northeast Pacific Street, Box 356421, Seattle, WA 98195, USA.
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12
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Prodinger PM, Pilge H, Banke IJ, Bürklein D, Gradinger R, Miethke T, Holzapfel BM. Acute osteomyelitis of the humerus mimicking malignancy: Streptococcus pneumoniae as exceptional pathogen in an immunocompetent adult. BMC Infect Dis 2013; 13:266. [PMID: 23738890 PMCID: PMC3679722 DOI: 10.1186/1471-2334-13-266] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2012] [Accepted: 05/27/2013] [Indexed: 03/04/2023] Open
Abstract
Background Chronic osteomyelitis due to direct bone trauma or vascular insufficiency is a frequent problem in orthopaedic surgery. In contrast, acute haematogenous osteomyelitis represents a rare entity that almost exclusively affects prepubescent children or immunodeficient adults. Case Presentation In this article, we report the case of acute pneumococcal osteomyelitis of the humerus in an immunocompetent and otherwise healthy 44-year-old male patient presenting with minor inflammation signs and misleading clinical features. Conclusions The diagnosis had to be confirmed by open biopsy which allowed the initiation of a targeted therapy. A case of pneumococcal osteomyelitis of a long bone, lacking predisposing factors or trauma, is unique in adults and has not been reported previously.
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Affiliation(s)
- Peter M Prodinger
- Clinic for Orthopaedics and Sports Orthopaedics, Klinikum Rechts der Isar, Technical University Munich, Ismaninger Straße 22, D-81675, Munich, Germany.
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13
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Al-Waili BR, Al-Thawadi S, Hajjar SA. Impact of the revised penicillin susceptibility breakpoints for Streptococcus pneumoniae on antimicrobial resistance rates of meningeal and non-meningeal pneumococcal strains. Ann Saudi Med 2013; 33:111-5. [PMID: 23562996 PMCID: PMC6078623 DOI: 10.5144/0256-4947.2013.111] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND AND OBJECTIVES In January 2008, the Clinical Laboratory Standard Institute (CLSI) revised the Streptococcus pneumoniae breakpoints for penicillin to define the susceptibility of meningeal and non-meningeal isolates. We studied the impact of these changes. In addition, the pneumococcal resistance rate to other antimicrobial agents was reviewed. DESIGN AND SETTING Laboratory data on peumococcal isolates collected retrospectively from hospitalized children in tertiary care hospital in Riyadh, Saudi Arabia from January 2006 to March 2012. PATIENTS AND METHODS Only sterile samples were included from cerebrospinal fluids, blood, sterile body fluids and surgical tissue. Other samples such as sputum and non sterile samples were excluded. We included samples from children 14 years old or younger. The minimum inhibitory concentration (MIC) for penicillin, cefuroxime, ceftriaxone and meropenem were determined by using the E-test, while susceptibility to erythromycin, cotrimoxazole and vancomycin were measured using the disc diffusion methods following the guideline of CLSI. RESULTS Specimens were analyzed in two different periods: from January 2006 to December 2007 and from January 2008 to March 2012. During the two periods there were 208 samples of which 203 were blood samples. Full penicillin resistance was detected in 6.6% in the first period. There was decrease in penicillin nonmeningeal resistance to 1.5% and an increase in resistance in penicillin meningeal 68.2% in the second period (P=.0001). There was an increase in rate of resistance among S pneumoniae isolates over the two periods to parenteral cefuroxime, erythromycin and cotrimoxazole by 34.6%, 35.5% and 51.9%, respectively. Total meropenem resistance found 4.3% and no vancomycin resistance was detected. CONCLUSIONS The current study supports the use of the revised CLSI susceptibility breakpoints that promote using penicillin to treat nonmeningeal pneumococcal disease, and might slow the development of resistance to broader-spectrum antibiotics.
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Affiliation(s)
- Badria R Al-Waili
- Department of Pediatrics, Infectious Disease Division, King Faisal Hospital & Research Centre, Riyadh 11211, Saudi Arabia.
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14
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Cornick J, Bentley S. Streptococcus pneumoniae: the evolution of antimicrobial resistance to beta-lactams, fluoroquinolones and macrolides. Microbes Infect 2012; 14:573-83. [DOI: 10.1016/j.micinf.2012.01.012] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2011] [Revised: 01/24/2012] [Accepted: 01/24/2012] [Indexed: 11/29/2022]
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Morosini MI, Cercenado E, Ardanuy C, Torres C. Detección fenotípica de mecanismos de resistencia en microorganismos grampositivos. Enferm Infecc Microbiol Clin 2012; 30:325-32. [DOI: 10.1016/j.eimc.2011.09.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2011] [Accepted: 09/08/2011] [Indexed: 10/14/2022]
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Rivera AM, Boucher HW. Current concepts in antimicrobial therapy against select gram-positive organisms: methicillin-resistant Staphylococcus aureus, penicillin-resistant pneumococci, and vancomycin-resistant enterococci. Mayo Clin Proc 2011; 86:1230-43. [PMID: 22134942 PMCID: PMC3228624 DOI: 10.4065/mcp.2011.0514] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Gram-positive bacteria cause a broad spectrum of disease in immunocompetent and immunocompromised hosts. Despite increasing knowledge about resistance transmission patterns and new antibiotics, these organisms continue to cause significant morbidity and mortality, especially in the health care setting. Methicillin-resistant Staphylococcus aureus poses major problems worldwide as a cause of nosocomial infection and has emerged as a cause of community-acquired infections. This change in epidemiology affects choices of empirical antibiotics for skin and skin-structure infections and community-acquired pneumonia in many settings. Throughout the world, the treatment of community-acquired pneumonia and other respiratory tract infections caused by penicillin-resistant Streptococcus pneumoniae has been complicated by resistance to β-lactam and macrolide antibacterial drugs. Vancomycin-resistant enterococci are a major cause of infection in the hospital setting and remain resistant to treatment with most standard antibiotics. Treatment of diseases caused by resistant gram-positive bacteria requires appropriate use of available antibiotics and stewardship to prolong their effectiveness. In addition, appropriate and aggressive infection control efforts are vital to help prevent the spread of resistant pathogens.
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Affiliation(s)
- Ana Maria Rivera
- Division of Geographic Medicine and Infectious Diseases, Tufts Medical Center, Boston, MA 02111, USA
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Belkhouja K, Ben Romdhane K, Ghariani A, Hammami A, M'hiri E, Slim-Saidi L, Ben Khelil J, Besbes M. Severe pneumococcal community-acquired pneumonia admitted to medical Tunisian ICU. J Infect Chemother 2011; 18:324-31. [PMID: 22045164 PMCID: PMC7100790 DOI: 10.1007/s10156-011-0337-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2011] [Accepted: 10/19/2011] [Indexed: 01/31/2023]
Abstract
Streptococcus pneumoniae is the most common cause of community-acquired pneumonia (CAP). There are no available data about this disease in Tunisian intensive care patients. The objective of this study is to describe the clinical and microbiological features of pneumococcal CAP and determine the prognostic factors. This is a retrospective cohort study of all pneumococcal CAP cases hospitalized in the medical intensive care unit (ICU) of Hospital A. Mami of Ariana (Tunisia) between January 1999 and August 2008. Included were 132 patients (mean age, 49.5 years; 82.6% males); 30 patients had received antimicrobial treatment before hospital admission. The mean of the Simplified Acute Physiology Score II was 32.9. All patients had an acute respiratory failure; 34 patients (25.8%) had pneumococcal bacteremic CAP. Among the isolated strains, 125 antimicrobial susceptibility tests were performed. The use of the new Clinical and Laboratory Standards Institute breakpoints for susceptibility when testing penicillin against S. pneumoniae showed that all isolated strains were susceptible to penicillin. The mortality rate was 25%. The need of mechanical ventilation at admission [odds ratio (OR), 3.4; 95% confidence interval (CI), 1.67-6.94; P = 0.001), Sepsis-related Organ Failure Assessment (SOFA) score at admission ≥4 (OR, 3.1; 95% CI, 1.56-6.13; P = 0.001), and serum creatinine at admission ≥102 μmol/l (OR, 1.8; 95% CI, 1.02-3.17; P = 0.043) were independent factors related to ICU mortality. In conclusion, pneumococcal CAP requiring hospitalization in the ICU is associated with high mortality. All isolated stains were susceptible to penicillin.
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Affiliation(s)
- Khairallah Belkhouja
- Department of Intensive Care Medicine, Abderrahmen Mami Hospital, Ariana, Tunisia.
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Haas W, Hesje CK, Sanfilippo CM, Morris TW. High proportion of nontypeable Streptococcus pneumoniae isolates among sporadic, nonoutbreak cases of bacterial conjunctivitis. Curr Eye Res 2011; 36:1078-85. [PMID: 21988450 DOI: 10.3109/02713683.2011.624670] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE Outbreaks of bacterial conjunctivitis have been linked to nontypeable strains of Streptococcus pneumoniae that lack a capsule, a key virulence factor for invasive infections. In contrast, isolates from sporadic, nonoutbreak cases of conjunctivitis were thought to be similar to invasive or nasopharyngeal isolates with respect to their capsular serotype and antibiotic resistance profile. This hypothesis was tested for 302 strains isolated during three prospective, multicenter clinical studies of bacterial conjunctivitis. MATERIALS AND METHODS S. pneumoniae capsular serotypes were determined by agglutination assay and confirmed by the Statens Serum Institute. The presence of the cpsAB capsule genes was determined by polymerase chain reaction (PCR). Minimum inhibitory concentrations were measured for 17 antibacterial drugs by the broth microdilution method. RESULTS Only 25 (8.3%) isolates reacted with the capsule-specific antisera and only one (0.3%) of these serotypes was covered by the capsule-specific PCV7 vaccine. The remaining 277 (91.7%) isolates were nontypeable, suggesting that they did not produce a capsule. PCR analysis indicated the loss of the capsule operon in 24/25 randomly selected nontypeable strains. Resistance rates were highest for azithromycin, trimethoprim, and tetracycline, while no resistance was detected for the fluoroquinolones, linezolid, and vancomycin. Antibiotic resistance rates were generally lower than those reported for invasive isolates, although some highly resistant or multidrug-resistant isolates were identified. CONCLUSIONS The prevalence of nontypeable strains of S. pneumoniae was higher than expected, while the number of isolates responsive to the PCV7 vaccine was surprisingly low. These results highlight the need for new vaccines that can target all S. pneumoniae strains regardless of the presence or nature of a capsule. In addition, resistance to azithromycin, erythromycin, tetracycline, and trimethoprim was greater than 10%, which may be relevant when selecting empiric treatments for ocular surface infections.
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Pääkkönen M, Peltola H. Antibiotic treatment for acute haematogenous osteomyelitis of childhood: moving towards shorter courses and oral administration. Int J Antimicrob Agents 2011; 38:273-80. [PMID: 21640559 DOI: 10.1016/j.ijantimicag.2011.04.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Accepted: 04/05/2011] [Indexed: 11/29/2022]
Abstract
Acute haematogenous osteomyelitis (AHOM) of childhood usually affects the long bones of the lower limbs. Although almost any agent may cause AHOM, Staphylococcus aureus is the most common bacterium, followed by Streptococcus pneumoniae and, in some countries, Salmonella spp. and Kingella kingae. Magnetic resonance imaging (MRI) has improved the diagnostic accuracy of traditional radiography and scintigraphy. Except for the pre-treatment diagnostic sample from bone before the institution of antibiotic therapy, no other surgery is usually required. Traditionally, non-neonatal AHOM has been treated with a 1-3-month course of antibiotics, including an intravenous (i.v.) phase for the first weeks, but recent prospective randomised studies challenge this approach. For most uncomplicated cases, a course of 20 days including an i.v. period of 2-4 days suffices, provided large enough doses of a well-absorbed agent (clindamycin or a first-generation cephalosporin, local resistance permitting) are used, administration is four times daily and most symptoms and signs subside within a few days. Serum C-reactive protein (CRP) is a good guide in monitoring the course of illness, and the antimicrobial can usually be discontinued if CRP has decreased to <20 mg/L. Newer and costly agents, such as linezolid, should be reserved for cases due to resistant S. aureus strains. AHOM in neonates and immunocompromised patients probably requires a different approach. Because sequelae may develop slowly, follow-up for at least 1 year post hospitalisation is recommended.
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Affiliation(s)
- M Pääkkönen
- Helsinki University Central Hospital, Hospital for Children and Adolescents, Helsinki, Finland.
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