Prevention of Viridans Group Streptococcal Infective Endocarditis: A Scientific Statement From the American Heart Association.

BACKGROUND: In 2007, the American Heart Association published updated evidence-based guidelines on the recommended use of antibiotic prophylaxis to prevent viridans group streptococcal (VGS) infective endocarditis (IE) in cardiac patients undergoing invasive procedures. The 2007 guidelines significantly scaled back the underlying conditions for which antibiotic prophylaxis was recommended, leaving only 4 categories thought to confer the highest risk of adverse outcome. The purpose of this update is to examine interval evidence of the acceptance and impact of the 2007 recommendations on VGS IE and, if needed, to make revisions based on this evidence. METHODS AND RESULTS: A writing group was formed consisting of experts in prevention and treatment of infective endocarditis including members of the American Dental Association, the Infectious Diseases Society of America, and the American Academy of Pediatrics, in addition to the American Heart Association. MEDLINE database searches were done for English language articles on compliance with the recommendations in the 2007 guidelines and the frequency of and morbidity or mortality from VGS IE after publication of the 2007 guidelines. Overall, there was good general awareness of the 2007 guidelines but variable compliance with recommendations. There was no convincing evidence that VGS IE frequency, morbidity, or mortality has increased since 2007. CONCLUSIONS: On the basis of a review of the available evidence, there are no recommended changes to the 2007 VGS IE prevention guidelines. We continue to recommend VGS IE prophylaxis only for categories of patients at highest risk for adverse outcome while emphasizing the critical role of good oral health and regular access to dental care for all. Randomized controlled studies to determine whether antibiotic prophylaxis is effective against VGS IE are needed to further refine recommendations.

Diagnosing odontogenic sinusitis of endodontic origin: A multidisciplinary literature review.

PURPOSE: Endodontic disease is one of the most common causes of bacterial odontogenic sinusitis (ODS). Diagnosing ODS of endodontic origin involves otolaryngologists confirming sinusitis, and dental specialists confirming endodontic sources. The purpose of this study was to conduct a multidisciplinary literature review to highlight clinical and microbiological features of ODS, and the most optimal diagnostic modalities to confirm endodontic disease. METHODS: An extensive review of both medical and dental literature was performed by rhinologists, endodontists, and an infectious disease specialist. Frequencies of various clinical and microbiological features from ODS studies were collected, and averages were calculated. Different endodontic testing and imaging modalities were also evaluated on their abilities to confirm endodontic disease. RESULTS: ODS patients most often present with unilateral sinonasal symptoms for over 3 months, purulence on nasal endoscopy, and overt dental pathology on computed tomography (CT). Subjective foul smell, and maxillary sinus cultures demonstrating anaerobes and α-streptococci (viridans group) may be more specific to ODS. For endodontic evaluations, cold pulp testing and cone-beam CT imaging are most optimal for confirming pulpal and periapical disease. CONCLUSION: Diagnosing ODS requires collaboration between otolaryngologists and dental specialists. Clinicians should suspect ODS when patients present with unilateral sinonasal symptoms, especially foul smell. Patients will generally have purulent drainage on nasal endoscopy, and both sinus opacification and overt dental pathology on CT. However, some patients will have subtle or absent dental pathology on CT. For suspected endodontic disease, endodontists should be consulted for at least cold pulp testing, and ideally cone-beam CT.

The epidemiological and clinical features of odontogenic infective endocarditis.

Antibiotic prophylaxis (AP) of infective endocarditis (IE) in dental practice is a controversial topic. We evaluated the characteristics of the odontogenic IE and assessed the practice and sources of information pertaining to the topic utilized by the Croatian dentists. We conducted a retrospective review of consecutive medical charts of adult patients with IE, admitted to the University Hospital for Infectious Diseases in Zagreb, Croatia, between January 2007 and December 2017. In addition, a cross-sectional, self-reporting questionnaire survey was conducted with participation of 348 Croatian dentists. Of the 811 admissions for suspected IE (40.3% of all Croatian and 92.1% of all Zagreb hospitals), 386 patients were confirmed as definite IE: 68 with odontogenic IE and 318 with IE of other origin. Their first hospital admissions were analyzed. Definite odontogenic IE was defined as a positive echocardiographic result in conjunction with two separate positive blood cultures showing exclusive oral cavity pathogen or Streptococcus viridans associated with current or recent (< 1 month) dental, periodontal, or oral cavity infection. The annual number of new odontogenic IE patients appeared constant over time. In 91.2% of the cases, odontogenic IE was not preceded by a dental procedure; poor oral health was found in 51.5% of patients, and 47.1% had no cardiac condition that increases the IE risk. In-hospital mortality was 5.1% with conservative treatment and 4.5% with cardiac surgery and was much lower for odontogenic IE than in non-odontogenic IE (14.6% and 34.4%, respectively). An increasing number of admissions for non-odontogenic IE were observed in parallel with an increasing number of staphylococcal IE. Surveyed dentists (500 invited, 69.6% responded) were aware of the AP recommendations, but were largely reluctant to treat patients at risk. In people with poor oral health, AP should be considered regardless of cardiac risk factors. Improvement of oral health should be the cornerstone of odontogenic IE prevention.

Clinical Significance of Isolates Known to Be Blood Culture Contaminants in Pediatric Patients.

Background and objectives: The objective of this study was to investigate the clinical significance of isolates from blood stream infection known to be blood culture contaminants in pediatric patients. Materials and Methods: Microbiological reports and medical records of all blood culture tests issued from 2002 to 2012 (n = 76,331) were retrospectively reviewed. Evaluation for potential contaminants were done by reviewing medical records of patients with the following isolates: coagulase-negative Staphylococcus, viridans group Streptococcus, Bacillus, Corynebacterium, Micrococcus, Aerococcus, and Proprionibacterium species. Repeated cultures with same isolates were considered as a single case. Cases were evaluated for their status as a pathogen. Results: Coagulase-negative Staphylococcus had clinical significance in 23.8% of all cases. Its rate of being a true pathogen was particularly high in patients with malignancy (43.7%). Viridans group Streptococcus showed clinical significance in 46.2% of all cases. Its rate of being a true pathogen was similar regardless of the underlying morbidity of the patient. The rate of being a true pathogens for remaining isolates was 27.7% for Bacillus and 19.0% for Corynebacterium species. Conclusions: Coagulase-negative Staphylococcus and viridans group Streptococcus isolates showed high probability of being true pathogens in the pediatric population, especially in patients with underlying malignancy.

The clinical impact of patients with bloodstream infection with different groups of Viridans group streptococci by using matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS).

The accuracy of matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) for identifying viridans group streptococcus (VGS) was improving. However, the clinical impact of identifying VGS had not been well recognized. Our study had comprehensively studied the clinical manifestations and outcome of VGS blood stream infection by using MALDI-TOF MS for identification.This retrospective study enrolled 312 adult patients with a monomicrobial blood culture positive for VGS. Blood culture was examined through MALDI-TOF MS.The most common VGS species were the Streptococcus anginosus group (38.8%) and Streptococcus mitis group (22.8%). Most species showed resistance to erythromycin (35.6%), followed by clindamycin (25.3%) and penicillin (12.5%). Skin and soft tissue infection and biliary tract infection were significantly related to S. anginosus group bacteremia (P = .001 and P = .005, respectively). S. mitis group bacteremia was related to infective endocarditis and bacteremia with febrile neutropenia (P = .005 and P < .001, respectively). Infective endocarditis was also more likely associated with S. sanguinis group bacteremia (P = .009). S. anginosus group had less resistance rate to ampicillin, erythromycin, clindamycin, and ceftriaxone (P = .019, <.001, .001, and .046, respectively). A more staying in intensive care unit, underlying solid organ malignancy, and a shorter treatment duration were independent risk factors for 30-day mortality. This study comprehensively evaluated different VGS group and their clinical manifestations, infection sources, concomitant diseases, treatments, and outcomes. Categorizing VGS into different groups by MALDI-TOF MS could help clinical physicians well understand their clinical presentations.

In vitro effects of commercial mouthwashes on several virulence traits of Candida albicans, viridans streptococci and Enterococcus faecalis colonizing the oral cavity.

Oral microbiota consists of hundreds of different species of bacteria, fungi, protozoa and archaea, important for oral health. Oral mycoses, mostly affecting mucosae, are mainly caused by the opportunistic pathogen Candida albicans. They become relevant in denture-wearers elderly people, in diabetic patients, and in immunocompromised individuals. Differently, bacteria are responsible for other pathologies, such as dental caries, gingivitis and periodontitis, which affect even immune-competent individuals. An appropriate oral hygiene can avoid (or at least ameliorate) such pathologies: the regular and correct use of toothbrush, toothpaste and mouthwash helps prevent oral infections. Interestingly, little or no information is available on the effects (if any) of mouthwashes on the composition of oral microbiota in healthy individuals. Therefore, by means of in vitro models, we assessed the effects of alcohol-free commercial mouthwashes, with different composition (4 with chlorhexidine digluconate, 1 with fluoride, 1 with essential oils, 1 with cetylpyridinium chloride and 1 with triclosan), on several virulence traits of C. albicans, and a group of viridans streptococci, commonly colonizing the oral cavity. For the study here described, a reference strain of C. albicans and of streptococci isolates from pharyngeal swabs were used. Chlorhexidine digluconate- and cetylpyridinium chloride-containing mouthwashes were the most effective in impairing C. albicans capacity to adhere to both abiotic and biotic surfaces, to elicit proinflammatory cytokine secretion by oral epithelial cells and to escape intracellular killing by phagocytes. In addition, these same mouthwashes were effective in impairing biofilm formation by a group of viridans streptococci that, notoriously, cooperate with the cariogenic S. mutans, facilitating the establishment of biofilm by the latter. Differently, these mouthwashes were ineffective against other viridans streptococci that are natural competitors of S. mutans. Finally, by an in vitro model of mixed biofilm, we showed that mouthwashes-treated S. salivarius overall failed to impair C. albicans capacity to form a biofilm. In conclusion, the results described here suggest that chlorhexidine- and cetylpyridinium-containing mouthwashes may be effective in regulating microbial homeostasis of the oral cavity, by providing a positive balance for oral health. On the other side, chlorhexidine has several side effects that must be considered when prescribing mouthwashes containing this molecule.

The activation of the oxidative stress response transcription factor SKN-1 in Caenorhabditis elegans by mitis group streptococci.

The mitis group, a member of the genetically diverse viridans group streptococci, predominately colonizes the human oropharynx. This group has been shown to cause a wide range of infectious complications in humans, including bacteremia in patients with neutropenia, orbital cellulitis and infective endocarditis. Hydrogen peroxide (H2O2) has been identified as a virulence factor produced by this group of streptococci. More importantly, it has been shown that Streptococcus oralis and S. mitis induce epithelial cell and macrophage death via the production of H2O2. Previously, H2O2 mediated killing was observed in the nematode Caenorhabditis elegans in response to S. oralis and S. mitis. The genetically tractable model organism C. elegans is an excellent system to study mechanisms of pathogenicity and stress responses. Using this model, we observed rapid H2O2 mediated killing of the worms by S. gordonii in addition to S. mitis and S. oralis. Furthermore, we observed colonization of the intestine of the worms when exposed to S. gordonii suggesting the involvement of an infection-like process. In response to the H2O2 produced by the mitis group, we demonstrate the oxidative stress response is activated in the worms. The oxidative stress response transcription factor SKN-1 is required for the survival of the worms and provides protection against H2O2 produced by S. gordonii. We show during infection, H2O2 is required for the activation of SKN-1 and is mediated via the p38-MAPK pathway. The activation of the p38 signaling pathway in the presence of S. gordonii is not mediated by the endoplasmic reticulum (ER) transmembrane protein kinase IRE-1. However, IRE-1 is required for the survival of worms in response to S. gordonii. These finding suggests a parallel pathway senses H2O2 produced by the mitis group and activates the phosphorylation of p38. Additionally, the unfolded protein response plays an important role during infection.

Activity of dalbavancin tested against Gram-positive clinical isolates causing skin and skin-structure infections in paediatric patients from US hospitals (2014-2015).

OBJECTIVES: This study provides an in vitro analysis of dalbavancin activity against isolates causing skin and skin-structure infections (SSSIs) in children. METHODS: A total of 770 Staphylococcus aureus, 167 ß-haemolytic streptococci (BHS), 42 coagulase-negative staphylococci (CoNS), 25 Enterococcus faecalis and 13 viridans group streptococci (VGS) were collected from children (<18years old) in the USA (2014-2015). RESULTS: Dalbavancin had MIC50/90 values of 0.03/0.06µg/mL against S. aureus and CoNS, including methicillin-resistant (MRSA) and -susceptible (MSSA) isolates. Dalbavancin MICs were 8-32-fold lower than those of daptomycin (MIC50/90, 0.25/0.5µg/mL), vancomycin (MIC50/90, 0.5/1µg/mL) and linezolid (MIC50/90, 1/1µg/mL) against MRSA. These agents showed 100.0% susceptibility against MRSA, and clindamycin also had a high (92.7%) susceptibility rate. Dalbavancin (MIC50/90, 0.03/0.06µg/mL) and daptomycin (MIC50/90, 0.25/0.5µg/mL) were the most active agents against CoNS. When tested against E. faecalis, dalbavancin was up to 32-fold more active than ampicillin (MIC50/90, ≤0.5/1µg/mL), daptomycin (MIC50/90, 1/1µg/mL), linezolid (MIC50/90, 1/2µg/mL) and vancomycin (MIC50/90, 1/2µg/mL). Dalbavancin (MIC50/90, 0.008/0.03µg/mL), ceftriaxone (MIC50/90, ≤0.06/≤0.06µg/mL) and penicillin (MIC50/90, ≤0.06/≤0.06µg/mL) were the most active against BHS. VGS isolates were susceptible to dalbavancin (MIC100, 0.03µg/mL), with MICs 32-64-fold lower than daptomycin (MIC50/90, 0.5/0.5µg/mL), linezolid (MIC50/90, 0.5/1µg/mL) and vancomycin (MIC50/90, 0.5/0.5µg/mL). CONCLUSIONS: Approved agents available for the treatment of SSSI in children are limited. Dalbavancin demonstrated potent in vitro activity against isolates causing SSSI in children. Developing dalbavancin for SSSI treatment in children is warranted, provided safety and tolerability are satisfactory.

Bacteria endocarditis consolidation with vertebra bone tuberculosis: a case report.

BACKGROUND: The clinical features of bacteria endocarditis became atypical when consolidated with other conditions such as tuberculosis (TB). Especially, the symptoms of bacteria endocarditis (BE) which were hidden behind the TB fever often lead to misdiagnosis and missed diagnosis. CASE PRESENTATION: A 56-year-old male with thoracic vertebra bone TB history presented with low-grade fever, shortness of breath and cardiac souffle. After conventional antibiotic therapy and strengthen anti-tuberculosis treatment condition did not be improved. Further inspection, there were bacteria endocarditis with the vegetation across the mitral valve. But the other valves were not involved. He was treated with intravenous penicillin for 4 weeks in all including during surgery, and following with oral antibiotic for another 2 weeks. The patient improved clinically eventually. CONCLUSION: It is the first reported case of isolated thoracic vertebra tuberculosis with valve endocarditis caused by streptococcus viridans and was successfully managed by combination therapy of internal medicine and surgery. It was suggested in tuberculosis patients, the possibility of bacterial endocarditis should be considered when came into fever and unexplained cardiac soufflé (in tuberculosis patients).

Características clínicas y epidemiológicas de la endocarditis infecciosa en pediatría: 26 años de experiencia / Clinical and epidemiological charasterisitics of infective endocarditis in children: a 26-year experience

Introducción: La endocarditis infecciosa es una enfermedad infrecuente en pediatría, aunque presenta una elevada morbimortalidad. El objetivo de este estudio es evaluar las características y la evolución clínica de nuestra serie de pacientes y comparar los resultados con otros estudios publicados. Material y métodos: Estudio retrospectivo descriptivo. Se incluyen todos los pacientes menores de 16 años con diagnóstico de endocarditis, según los criterios modificados de Duke, entre 1988 y 2013. Se comparan 2 periodos: 1988-2000 y 2001-2013. Resultados: Se analizan 44 pacientes, 36 pediátricos y 8 neonatos. La incidencia de endocarditis aumentó, entre los 2 periodos comparados, de 1/10.000 a 3,3/10.000 ingresos/año. El 63% de los pacientes tenía cardiopatía congénita y el 45% se había sometido a cirugía cardiaca. El 31,8% era portador de un catéter venoso central. El 82% mostró vegetaciones en la ecocardiografía. Los microorganismos más frecuentemente aislados fueron, por igual (20%), Staphylococcus aureus y Streptococcus viridans. El 29% de los pacientes precisó cirugía. La tasa de complicaciones fue del 56%, entre las cuales la más frecuente fue la insuficiencia cardiaca. La mortalidad fue del 20%, y entre los agentes etiológicos cabe destacar que un 55% de los pacientes presentó una afectación mitral y el 77% una infección por S. aureus u hongos. Conclusiones: La mayoría de los pacientes que desarrollan endocarditis padecen una cardiopatía y/o han sido sometidos a cirugía cardiaca. Observamos un aumento del número de endocarditis en niños prematuros, inmunodeprimidos y portadores de catéter vascular central o prótesis intracardiacas. Dada la elevada morbimortalidad de esta enfermedad, es importante sospecharla en los pacientes de riesgo. Se observa un peor pronóstico en los pacientes con afectación mitral o infección fúngica o por S. aureus (AU)

Introduction: Infective endocarditis is a rare disease in childhood. Nevertheless, morbimortality rates are still high. The aim of this study is to report the characteristics and clinical follow-up of our series of patients and to compare them to those reported in the literature. Material and methods: We perform a retrospective study in a third-level Spanish hospital. Patients aged less than 16 years and diagnosed with endocarditis, according to Duke criteria, from 1988 to 2013 were selected. Two periods of time were compared: 1988-2000 and 2001-2013. Results: A total of 44 patients were included (36 pediatric and 8 neonates). The incidence of endocarditis increased from 1/10,000 admissions/year to 3.3/10,000 from one period to the next. Of the total of patients, 63% had some kind of congenital heart disease and up to 45% had undergone previous cardiac surgery. Thirty-one percent of the patients had a central venous catheter. Echocardiography showed vegetations in 82% of the patients. Staphylococcus aureus and Streptococcus viridans were the microorganisms most frequently found in blood cultures. Endocarditis was treated surgically in 29% of cases. The rate of endocarditis-related complications was 56%, being heart failure the most frequent. Mortality rate reached 20%. Of the total of deaths, 55% had mitral involvement and 77% were caused by S. aureus or fungical infection. Conclusion: The majority of patients who develop endocarditis have previous history of congenital heart disease and/or have undergone cardiac surgery. An increase of frequency of endocarditis was observed in premature, or immunodepressed patients, as well as in patients with central vascular catheters or prosthesis. A worse prognosis was observed in patients with mitral involvement and in those infected with fungi or S. aureus (AU)

[THE DIAGNOSTIC APPROACHES TO VERIFICATION OF STREPTOCOCCUS INFECTION IN PATIENTS WITH INFECTIOUS MONONUCLEOSIS].

The Rostovskii state medical university of Minzdrav of Russia, 344022 Rostov-on-Don, Russia The analysis is applied concerning significance of laboratory techniques of verification of streptococcus infection (bacteriological analysis, detection of anti-streptolysin O in pair serums) in 148 patients with infectious mononucleosis aged from 3 to 15 years. The content of anti-streptolysin O exceeded standard in 41 ± 4.8% of patients with concomitant in acute period and in 49.5 ± 4.9% during period of re-convalescence. This data differed from analogous indicator in patients with negative result of examination on streptococcus infection independently of period of disease (9.3 ± 2.8%). The exceeding of standard of anti-streptolysin O was detected more frequently (t ≥ 2, P ≥ 95%) in patients with isolation of Streptococcus pyogenes (56.9 ± 5.8%) than in patients with Streptococcus viridans (31.2 ± 6.5%). The concentration of anti-streptolysin 0 in patients with concomitant streptococcus infection varied within limits 200-1800 IE/ml. The minimal level of anti-streptolysin O (C = 200 IE/mI) was detected independently of type of isolated Streptococcus and period of disease. The high levels of anti-streptolysin O were observed exclusively in patients with isolation of Streptococcus pyogenes. In blood serum ofpatient with concomitant streptococcus infection (Streptococcus pyogenes + Streptococcus viridans) increasing of level of anti-streptolysin O was detected in dynamics of diseases from minimal (C = 200 IE/ ml) to moderately high (200 < C < 400 IE/mI). It is demonstrated that to identify streptococcus infection in patients with infectious mononucleosis the anamnesis data is to be considered. The complex bacteriological and serological examination ofpatients is to be implemented This is necessary for early detection ofpatients with streptococcus infection and decreasing risk of formation of streptococcus carrier state.

Guía clínica para la prevención de la endocarditis infecciosa / Clinical guidelines for the prevention of infective endocarditis

En este artículo se recogen las recomendaciones para la prevención de la endocarditis infecciosa (EI), contenidas en las guías elaboradas por la American Heart Association (AHA) y la European Society of Cardiology (ESC) a partir de las cuales, se han consensuado las recomendaciones de la Sociedad Española de Cardiología Pediátrica y Cardiopatías Congénitas. En los últimos años se ha producido un cambio considerable en las recomendaciones para la prevención de la EI, motivado principalmente por la falta de evidencia sobre la eficacia de la profilaxis antibiótica en su prevención y el riesgo de desarrollo de resistencias a los antibióticos utilizados. El cambio principal consiste en una reducción de las indicaciones de la profilaxis antibiótica, tanto en lo relativo a los pacientes como a los procedimientos considerados de riesgo. Las guías de práctica clínica y las recomendaciones deben asistir a los profesionales de la salud en la toma de decisiones clínicas en su ejercicio diario. No obstante, el juicio último sobre el cuidado de un paciente concreto lo debe tomar el médico responsable

This article sets out the recommendations for the prevention of infective endocarditis (IE), contained in the guidelines developed by the American Heart Association (AHA) and the European Society of Cardiology (ESC), from which the recommendations of the Spanish Society of Paediatric Cardiology and Congenital Heart Disease have been agreed. In recent years, there has been a considerable change in the recommendations for the prevention of IE, mainly due to the lack of evidence on the effectiveness of antibiotic prophylaxis in prevention, and the risk of the development of antibiotic resistance. The main change is a reduction of the indications for antibiotic prophylaxis, both in terms of patients and procedures considered at risk. Clinical practice guidelines and recommendations should assist health professionals in making clinical decisions in their daily practice. However, the ultimate judgment regarding the care of a particular patient must be taken by the physician responsible

Clinical features of infective endocarditis: comparison between the 1990s and 2000s.

BACKGROUND: The circumstances surrounding infective endocarditis (IE) are under constant change due to an increase in drug-resistant organisms, a decrease in rheumatic valve disease, progress in surgical treatment, and aging society. The purpose of this study was to compare clinical features of IE between the 1990s and 2000s and to elucidate the determinants of death or clinical event. METHODS: All hospital admission records between January 1990 and December 2009 were retrospectively analyzed. The definition of IE was based on modified Duke criteria. Clinical presentation, blood culture, laboratory results, and echocardiography findings were compared between the 1990s and 2000s. RESULTS: There were 112 patients with definite or probable IE according to modified Duke criteria. The most frequent organism causing IE was Streptococcus viridians both in the 1990s and 2000s. The determinants of in-hospital death were hemodialysis and congestive heart failure. The in-hospital mortality of IE was 5.4% in the 1990s and 13.3% in the 2000s. Composite events of in-hospital death and central nervous system disorders were significantly higher in the 2000s compared with the 1990s. CONCLUSION: The most frequent causative organism of IE was S. viridians, both in the 1990s and 2000s. Independent predictors of in-hospital mortality in IE were hemodialysis and congestive heart failure.

[Apoptogenic activity of microbes-associants during Epstein-Barr virus infection].

AIM: Study apoptogenic activity of-microbes-associants during Epstein-Barr virus infection (EBVI) on the model of mice peritoneal macrophages in vitro. MATERIALS AND METHODS: Evaluation of apoptosis induced by bacteria isolated from EBVI patients was carried out by characteristic morphological changes of macrophages in smears stained by May-Grunwald with additional staining by Romanowsky-Giemsa. RESULTS: All the EBVI microbes-associants were established to have apoptogenic activity, however, the highest pathogenic potential was noted in Streptococcus pyogenes. CONCLUSION: The presence of apoptogenic activity in bacterial microflora accompanying EBVI against immune system cells could serve as means of their survival and be the pathogenetic basis for prolonged persistence in the organism.

Estreptococo del grupo B que «atraviesa la barrera» del Protocolo de Atlanta / Streptococcus agalactiae, or group B, that «crosses the barrier» of Atlanta’s Protocolo

Se presenta el caso de un recién nacido de 6 días de vida, atendido en el centro de salud, cuya madre estaba contaminada por el estreptococo grupo B (SGB), o Agalactiae, durante la gestación y que había recibido 4 dosis de ampicilina intraparto. En los informes no se mencionó la presencia de SGB ni nada relativo al tratamiento antibiótico profiláctico intraparto. El recién nacido presentaba ictericia, por lo que se remitió al hospital e ingresó en el servicio de neonatología para realizar fototerapia, ya que presentaba una bilirrubinemia de 23,1 mg/dL. Fue dado de alta con una bilirrubinemia de 10 mg/dL, una exploración física y una analítica normales, y alimentación con lactancia materna bien instaurada. Tras el alta, a los 13 días de vida, se realizó un urocultivo para descartar una contaminación por SGB, que se confirmó a los 15 días de vida, por lo que se diagnosticó como recién nacido contaminado por SGB y se inició tratamiento con amoxicilina oral durante 10 días, con controles clínicos y urocultivos posteriores normales(AU)

We present a case of a 6-day newborn attended at the health center, whose mother was contaminated with Streptococcus agalactiae or group B (GBS) during pregnancy and had received four doses of ampicillin intrapartum. The reports did not mention the presence of GBS or anything regarding intrapartum antibiotic prophylaxis. The newborn had jaundice so we sent him to the hospital and he was admitted to neonatal service for phototherarapy with bilirubin of 23.1 mg/dL and was discharged with bilirubin of 10 mg/dL and normal physical examination and laboratory and breast feeding well established. After discharge, at 13 days old, we took urine culture to discard contamination by SGB and the 15th day of age was confirmed and diagnosed as a newborn contaminated by SGB and began treatment with oral amoxicillin for 10 days, and good health controls and normal subsequent urine cultures(AU)

Inflammatory index and treatment of brain abscess.

This study retrospectively analyzed 12 patients with brain abscesses. Half of the patients were diagnosed inaccurately in the initial stage, and 7.2 days were required to achieve the final diagnosis of brain abscess. The patients presented only with a moderately elevated leukocyte count, serum CRP levels, or body temperatures during the initial stage. These markers changed, first with an increase in the leukocyte count, followed by the CRP and body temperature. The degree of elevation tended to be less prominent, and the time for each inflammatory index to reach its maximum value tended to be longer in the patients without ventriculitis than in those with it. The causative organisms of a brain abscess were detected in 10 cases. The primary causative organisms from dental caries were Streptococcus viridians or milleri, and Fusobacterium nucleatum. Nocardia sp. or farcinica were common when the abscess was found in other regions. The primary causative organisms of unrecognized sources of infection were Streptococcus milleri and Prolionibacterium sp. Nocardia is resistant to many antibiotics. However, carbapenem, tetracycline and quinolone were effective for Nocardia as well as many other kinds of bacteria. In summary, the brain abscesses presented with only mildly elevated inflammatory markers of body temperature, leukocyte and CRP. These inflammatory markers were less obvious in the patients without ventriculitis and/or meningitis. The source of infection tended to suggest some specific primary causative organism. It was reasonable to initiate therapy with carbapenem.

Two weeks of postsurgical therapy may be enough for high-risk cases of endocarditis caused by Streptococcus viridans or Streptococcus bovis.

The duration of antimicrobial therapy after surgery for infective endocarditis (IE) is controversial. A short course of postsurgical therapy is currently accepted only for patients with negative valve culture. We performed a retrospective (1994-2008) analysis of patients who underwent surgery for IE in our hospital and had a high risk of complications ( one of more of the following: <2 weeks of antibiotic treatment before surgery; embolism; perivalvular extension; and positive valve culture) to compare outcomes of patients who received short-course antimicrobial therapy (SAT) (median 15 days) or long-course antimicrobial therapy (LAT) (median 32 days), irrespective of the results of valve culture. Our endpoints included length of hospital stay, renal and hepatic failure, relapse, re-infection, and mortality rates 1 year after surgery. During the study period, 140 patients underwent surgery for IE (valve replacement, 87.9%). Of these, 133 fulfilled the high-risk group criteria and 92 completed the antimicrobial schedule. Comparison of patients receiving SAT (37) and LAT (55) showed that the SAT group had a shorter length of hospital stay (29 vs. 40 days, p 0.01), and a trend towards lower frequency of renal failure (5.4% vs. 18.2%, p 0.11) and hepatic failure (5.4% vs. 9.1%, p 0.69), whereas mortality (5.4% vs. 3.6%, p 1), relapse (0% vs. 1.8%, p 1) and re-infection (5.4% vs. 3.6%, p 1) rates were similar between both groups. Multivariate analysis showed that IE caused by Streptococcus viridans or Streptococcus bovis was independently associated with SAT. Postsurgical SAT is safe, especially when IE is caused by Streptococcus viridans or Streptococcus bovis, even in patients at high risk of complications.

Efficacy and safety of outpatient parenteral antibiotic therapy for infective endocarditis: a ten-year prospective study

Background: The length of treatment of infective endocarditis (IE) with parenteral antibiotics varies from2 to 6 weeks. Although several studies indicate that outpatient parenteral antibiotic treatment (OPAT)could be safe for uncomplicated viridans-group streptococci (VGS) IE, the experience in Spain is limited and data on other types of endocarditis and OPAT are scarce worldwide. Methods: Prospective single center study of a cohort including all patients with IE admitted to the Hospital Clinic of Barcelona OPAT program from January 1997 to December 2006.Results: During the study period, 392 consecutive episodes of IE in non-drug abusers were attended to.Of these, 73 episodes (42 native-valve, 23 prosthetic-valve, and 8 pacemaker-lead) were admitted to the OPAT program (19%). The percentage of inclusion was higher for viridans group streptococci (VGS) or Streptococcus bovis (S. bovis) IE (32% of all VGS or S. bovis IE episodes diagnosed vs. 14% of the remainingetiologies, P<.001). Twelve patients (16%) were readmitted due to complications, of which 3 died (4%).Glycopeptides use was the only predictor factor of hospital readmission (OR 4.5, 95% confidence interval1.2; 16.8, P=.026). No differences in OPAT outcome were found between VGS plus S. bovis IE and Staphylococcusaureus (S. aureus) plus coagulase-negative staphylococci IE. Patients spent a median of 17 dayon OPAT (interquartile range 11-26.5), which enabled 1,466 days of hospital stay to be saved. Conclusions: These data suggest that OPAT for IE may be a safe and effective therapeutic approach in the treatment of selected patients with types of endocarditis other than uncomplicated VGS or S. bovisendocarditis, although patients taking glycopeptides need close clinical OPAT monitoring (AU)

Antecedentes: La duración del tratamiento antibiótico endovenoso de la endocarditis infecciosa (EI) oscila entre 2 y 6 semanas. Aunque varios estudios indican que el tratamiento antibiótico a domicilio endovenoso (TADE) es seguro para el tratamiento domiciliario de la EI sobre válvula nativa no complicada por estreptococos del grupo viridans (EGV) la experiencia en España con TADE en la EI es limitada y los datos sobre otros tipos de endocarditis y TADE son escasos en todo el mundo. Métodos Estudio unicéntrico, prospectivo, de una cohorte de todos los pacientes con EI admitidos en el programa TADE en el Hospital Clínico de Barcelona entre enero de 1997 y diciembre de 2006.ResultadosDurante el período de estudio se diagnosticaron 392 episodios consecutivos de EI en pacientes no consumidores de drogas, de los cuales 73 episodios (19%) fueron admitidos en el programa de TADE: 42 EI sobre válvula nativa, 23 EI sobre válvula protésica y 8 EI sobre cable de marcapasos. El porcentaje de inclusión en la TADE fue mayor para la EI por EGV o Streptococcus bovis (S. bovis) (32%) que para el resto de etiologías (14%; p < 0,001). Doce pacientes (16%) fueron reingresados debido a las complicaciones de los cuales tres fallecieron (4%). El uso de glucopéptidos fue el único factor predictor de reingreso hospitalario (OR [intervalo de confianza del 95%] 4,5 [1,2; 16,8] p = 0,026). No se observaron diferencias entre las EI por EGV y S. bovis y las EI estafilocócicas (Staphylococcus aureus y estafilococos coagulasa-negativos) incluidas en el TADE. Los pacientes incluidos estuvieron una mediana de 17 días en tratamiento domiciliario (rango intercuartílico de 11 a 26,5), lo que permitió un ahorro de 1.466 días de estancia hospitalaria (..) (AU)

The pathogenic persona of community-associated oral streptococci.

The mitis group streptococci (MGS) are widespread in the oral cavity and are traditionally associated with oral health. However, these organisms have many attributes that contribute to the development of pathogenic oral communities. MGS adhere rapidly to saliva-coated tooth surfaces, thereby providing an attachment substratum for more overtly pathogenic organisms such as Porphyromonas gingivalis, and the two species assemble into heterotypic communities. Close physical association facilitates physiologic support, and pathogens such as Aggregatibacter actinomycetemcomitans display resource partitioning to favour carbon sources generated by streptococcal metabolism. MGS exchange information with community members through a number of interspecies signalling systems including AI-2 and contact dependent mechanisms. Signal transduction systems induced in P. gingivalis are based on protein dephosphorylation mediated by the tyrosine phosphatase Ltp1, and converge on a LuxR-family transcriptional regulator, CdhR. Phenotypic responses in P. gingivalis include regulation of hemin uptake systems and gingipain activity, processes that are intimately linked to the virulence of the organism. Furthermore, communities of S. gordonii with P. gingivalis or with A. actinomycetemcomitans are more pathogenic in animal models than the constituent species alone. We propose that MGS should be considered accessory pathogens, organisms whose pathogenic potential only becomes evident in the context of a heterotypic microbial community.