Posts filed under ‘Infecciones intraabdominales’

Inhibition of Plasmodium Liver Infection by Ivermectin

Antimicrobial Agents & Chemotherapy February 2017 V.61 N.2 e02005-16

António M. Mendes, Inês S. Albuquerque, Marta Machado, Joana Pissarra, Patrícia Meireles, and Miguel Prudêncio

Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal

Avermectins are powerful endectocides with an established potential to reduce the incidence of vector-borne diseases. Here, we show that several avermectins inhibit the hepatic stage of Plasmodium infection in vitro. Notably, ivermectin potently inhibits liver infection in vivo by impairing parasite development inside hepatocytes. This impairment has a clear impact on the ensuing blood stage parasitemia, reducing disease severity and enhancing host survival. Ivermectin has been proposed as a tool to control malaria transmission because of its effects on the mosquito vector. Our study extends the effect of ivermectin to the early stages of mammalian host infection and supports the inclusion of this multipurpose drug in malaria control strategies.

PDF

http://aac.asm.org/content/61/2/e02005-16.full.pdf+html

January 25, 2017 at 2:29 pm

Review – Role of cephalosporins in the era of Clostridium difficile infection

Journal of Antimicrobial Chemotherapy January 2017 V.72 N.1 P. 1-18

Mark H. Wilcox; James D. Chalmers; Carl E. Nord; Jane Freeman; Emilio Bouza

The incidence of Clostridium difficile infection (CDI) in Europe has increased markedly since 2000. Previous meta-analyses have suggested a strong association between cephalosporin use and CDI, and many national programmes on CDI control have focused on reducing cephalosporin usage. Despite reductions in cephalosporin use, however, rates of CDI have continued to rise. This review examines the potential association of CDI with cephalosporins, and considers other factors that influence CDI risk. EUCLID (the EUropean, multicentre, prospective biannual point prevalence study of CLostridium difficile Infection in hospitalized patients with Diarrhoea) reported an increase in the annual incidence of CDI from 6.6 to 7.3 cases per 10 000 patient bed-days from 2011–12 to 2012–13, respectively. While CDI incidence and cephalosporin usage varied widely across countries studied, there was no clear association between overall cephalosporin prescribing (or the use of any particular cephalosporin) and CDI incidence. Moreover, variations in the pharmacokinetic and pharmacodynamic properties of cephalosporins of the same generation make categorization by generation insufficient for predicting impact on gut microbiota. A multitude of additional factors can affect the risk of CDI. Antibiotic choice is an important consideration; however, CDI risk is associated with a range of antibiotic classes. Prescription of multiple antibiotics and a long duration of treatment are key risk factors for CDI, and risk also differs across patient populations. We propose that all of these are factors that should be taken into account when selecting an antibiotic, rather than focusing on the exclusion of individual drug classes.

FULL TEXT

https://academic.oup.com/jac/article/72/1/1/2643139/Role-of-cephalosporins-in-the-era-of-Clostridium

PDF

http://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/jac/72/1/10.1093_jac_dkw385/3/dkw385.pdf?Expires=1485599756&Signature=SddUPWXGgMIOXumKQr~qwNbCCMxsK8SI2aZVv0uL-tQpcHQXAjZGqgaF-JwVD0zdothcR0oHpy7YxjIXxOHKBLyTs1AWogBxAKbIw~YoEBxpodh~dPhFEWIX4DQ21EgUHCpEL5RWCCEUgCc8OSWe5So2NuUc~TYUPuHbcKVkWII~FWDqAFTjhzQ4zHBQjynBNavwak6qKUDIsMt5ZVatILj2ojFwALSL0EMe14CdE5iD-hOrfocqBpltMzG3Nm1TqVyGfkeXJ5V7xhE6Gq-CWaMkN8nIApRi2-BeZ2cs9A7p6ILOCUkp2FUSf5BNw-0RCizaK2v8SA3zFJCdwoUqFw__&Key-Pair-Id=APKAIUCZBIA4LVPAVW3Q

January 24, 2017 at 8:09 am

Short- and long-term effects of oral vancomycin on the human intestinal microbiota

Journal of Antimicrobial & Chemotherapy January 1, 2017 V.72 N.1 P.128-136

Sandrine Isaac, Jose U. Scher, Ana Djukovic, Nuria Jiménez, Dan R. Littman, Steven B. Abramson, Eric G. Pamer, and Carles Ubeda

1Departamento de Genómica y Salud, Centro Superior de Investigación en Salud Pública – FISABIO, Valencia, Spain

2Department of Medicine, New York University School of Medicine and Hospital for Joint Diseases, New York, NY, USA

3Molecular Pathogenesis Program, The Kimmel Center for Biology and Medicine of the Skirball Institute, New York University School of Medicine, New York, NY, USA

4Howard Hughes Medical Institute, New York University School of Medicine, New York, NY, USA

5Immunology Program and Infectious Disease Service, Memorial Sloan-Kettering Cancer Center, New York, NY, USA

6Lucille Castori Center for Microbes, Inflammation and Cancer, Memorial Sloan-Kettering Cancer Center, New York, NY, USA

7Centers of Biomedical Research Network (CIBER) in Epidemiology and Public Health, Madrid, Spain

Background

Oral vancomycin remains the mainstay of therapy for severe infections produced by Clostridium difficile, the most prevalent cause of healthcare-associated infectious diarrhoea in developed countries. However, its short- and long-term effects on the human intestinal microbiota remain largely unknown.

Methods

We utilized high-throughput sequencing to analyse the effects of vancomycin on the faecal human microbiota up to 22 weeks post-antibiotic cessation. The clinical relevance of the observed microbiota perturbations was studied in mice.

Results

During vancomycin therapy, most intestinal microbiota genera and operational taxonomic units (OTUs) were depleted in all analysed subjects, including all baseline OTUs from the phylum Bacteroidetes. This was accompanied by a vast expansion of genera associated with infections, including Klebsiella and Escherichia/Shigella. Following antibiotic cessation, marked differences in microbiota resilience were observed among subjects. While some individuals recovered a microbiota close to baseline composition, in others, up to 89% of abundant OTUs could no longer be detected. The clinical relevance of the observed microbiota changes was further demonstrated in mice, which developed analogous microbiota alterations. During vancomycin treatment, mice were highly susceptible to intestinal colonization by an antibiotic-resistant pathogen and, upon antibiotic cessation, a less-resilient microbiota allowed higher levels of pathogen colonization.

Conclusions

Oral vancomycin induces drastic and consistent changes in the human intestinal microbiota. Upon vancomycin cessation, the microbiota recovery rate varied considerably among subjects, which could influence, as validated in mice, the level of susceptibility to pathogen intestinal colonization. Our results demonstrate the negative long-term effects of vancomycin, which should be considered as a fundamental aspect of the cost–benefit equation for antibiotic prescription.

PDF

http://jac.oxfordjournals.org/content/72/1/128.full.pdf+html

January 6, 2017 at 7:34 am

Risk of transmission of carbapenem-resistant Enterobacteriaceae and related “superbugs” during gastrointestinal endoscopy.

World J Gastrointest Endosc. 2014 Oct 16;6(10):457-74.

Muscarella LF1.

Author information

1Lawrence F Muscarella, LFM Healthcare Solutions, LLC, Montgomeryville, PA 18936, United States.

Abstract

To evaluate the risk of transmission of carbapenem-resistant Enterobacteriaceae (CRE) and their related superbugs during gastrointestinal (GI) endoscopy. Reports of outbreaks linked to GI endoscopes contaminated with different types of infectious agents, including CRE and their related superbugs, were reviewed. Published during the past 30 years, both prior to and since CRE’s emergence, these reports were obtained by searching the peer-reviewed medical literature (via the United States National Library of Medicine’s “MEDLINE” database); the Food and Drug Administration’s Manufacturer and User Facility Device Experience database, or “MAUDE”; and the Internet (via Google’s search engine). This review focused on an outbreak of CRE in 2013 following the GI endoscopic procedure known as endoscopic retrograde cholangiopancreatography, or ERCP, performed at “Hospital X” located in the suburbs of Chicago (IL; United States). Part of the largest outbreak of CRE in United States history, the infection and colonization of 10 and 28 of this hospital’s patients, respectively, received considerable media attention and was also investigated by the Centers for Disease Control and Prevention (CDC), which published a report about this outbreak in Morbidity and Mortality Weekly Report (MMWR), in 2014. This report, along with the results of an independent inspection of Hospital X’s infection control practices following this CRE outbreak, were also reviewed. While this article focuses primarily on the prevention of transmissions of CRE and their related superbugs in the GI endoscopic setting, some of its discussion and recommendations may also apply to other healthcare settings, to other types of flexible endoscopes, and to other types of transmissible infectious agents. This review found that GI endoscopy is an important risk factor for the transmission of CRE and their related superbugs, having been recently associated with patient morbidity and mortality following ERCP. The CDC reported in MMWR that the type of GI endoscope, known as an ERCP endoscope, that Hospital X used to perform ERCP in 2013 on the 38 patients who became infected or colonized with CRE might be particularly challenging to clean and disinfect, because of the complexity of its physical design. If performed in strict accordance with the endoscope manufacturer’s labeling, supplemented as needed with professional organizations’ published guidelines, however, current practices for reprocessing GI endoscopes, which include high-level disinfection, are reportedly adequate for the prevention of transmission of CRE and their related superbugs. Several recommendations are provided to prevent CRE transmissions in the healthcare setting. CRE transmissions are not limited to contaminated GI endoscopes and also have been linked to other reusable flexible endoscopic instrumentation, including bronchoscopes and cystoscopes. In conclusion, contaminated GI endoscopes, particularly those used during ERCP, have been causally linked to outbreaks of CRE and their related superbugs, with associated patient morbidity and mortality. Thorough reprocessing of these complex reusable instruments is necessary to prevent disease transmission and ensure patient safety during GI endoscopy. Enhanced training and monitoring of reprocessing staffers to verify the proper cleaning and brushing of GI endoscopes, especially the area around, behind and near the forceps elevator located at the distal end of the ERCP endoscope, are recommended. If the ERCP endoscope features a narrow and exposed channel that houses a wire connecting the GI endoscope’s control head to this forceps elevator, then this channel’s complete reprocessing, including its flushing with a detergent using a procedure validated for effectiveness, is also emphasized.

PDF

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4198391/pdf/WJGE-6-457.pdf

December 30, 2016 at 7:54 am

Case of secondary syphilis presenting with unusual complications: syphilitic proctitis, gastritis, and hepatitis.

J Clin Microbiol. 2011 Dec;49(12):4394-6.

Adachi E1, Koibuchi T, Okame M, Sato H, Imai K, Shimizu S, Tsurita G, Oyaizu N, Iwamoto A, Fujii T.

Author information

1Department of Infectious Diseases and Applied Immunology, Research Hospital of The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan.

Abstract

We report the first known case of syphilis with simultaneous manifestations of proctitis, gastritis, and hepatitis. The diagnosis of syphilitic proctitis and gastritis was established by the demonstration of spirochetes with anti-Treponema pallidum antibody staining in biopsy specimens. Unusual manifestations of secondary syphilis completely resolved after 4 weeks of antibiotic therapy.

PDF

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3233005/pdf/zjm4394.pdf

December 11, 2016 at 12:17 pm

REVISION – Bacteriemia en el paciente crıtico

Med Intensiva. 2009;33(7):336–345

Sabatier, R. Peredo y J. Valles

Centro de Críticos, Hospital de Sabadell, Institut Universitari Parc Taul´ı, UAB, CIBER de Enfermedades Respiratorias, España

La bacteriemia es, junto con la neumoníıa asociada a la ventilación mecánica, la infeccion nosocomial mas frecuente en los pacientes crıticos y se asocia a una importante morbimortalidad. La principal causa de bacteriemia en estos pacientes son los cateteres intravasculares y,  por consiguiente, los microorganismos grampositivos se equiparan en frecuencia a los microorganismos gramnegativos como causantes de estas infecciones. Ademas, y con una frecuencia cada vez mas elevada, en muchas ocasiones estos microorganismos son multirresistentes, lo que dificulta la eleccion del tratamiento antibiotico empırico.

Tambien las infecciones graves adquiridas en la comunidad representan una parte importante de los pacientes que por inestabilidad hemodinamica o disfuncion organica requieren ingreso en la unidad de cuidados intensivos. Una parte importante presenta tambien bacteriemia, y representa aproximadamente un 30% del global de las bacteriemias de los pacientes crıticos. En estos casos mas de un 70% se manifiesta como sepsis grave o shock septico, y se acompañan tambien de una significativa mortalidad.

Ademas, recientemente se ha diferenciado a una poblacion de pacientes con infecciones adquiridas en la comunidad, pero que tienen algun contacto reciente o intermitente con algun tipo de asistencia sanitaria que presentan unas caracterısticas especıficas y equiparables en muchas ocasiones a las infecciones nosocomiales que deberıan tenerse en cuenta en el momento de la eleccion del tratamiento antibiotico empırico.

El objetivo de esta revision es conocer las caracterısticas, los orıgenes, las etiologıas y las complicaciones mas frecuentes de los pacientes crıticos con bacteriemia nosocomial, bacteriemia comunitaria o bacteriemia asociada a cuidados sanitarios con el fin de reconocerlas precozmente e iniciar un tratamiento de soporte y antibiotico empırico eficaz que pueda mejorar el pronostico de estos pacientes.

PDF

http://scielo.isciii.es/pdf/medinte/v33n7/revision.pdf

December 7, 2016 at 7:03 pm

Coexisting cytomegalovirus infection in immunocompetent patients with Clostridium difficile colitis.

J Microbiol Immunol Infect. 2016 Jan 12.

Chan KS1, Lee WY2, Yu WL3.

Author information

1Department of Intensive Care Medicine, Chi Mei Medical Center, Tainan City, Taiwan.

2Department of Pathology, Chi Mei Medical Center, Tainan City, Taiwan; Department of Pathology, Taipei Medical University, Taipei City, Taiwan.

3Department of Intensive Care Medicine, Chi Mei Medical Center, Tainan City, Taiwan; Department of Medicine, Taipei Medical University, Taipei City, Taiwan. Electronic address: yuleon_md@yahoo.com.tw

Abstract

Cytomegalovirus (CMV) colitis usually occurs in immunocompromised patients with human immunodeficiency virus infection, organ transplantation, and malignancy receiving chemotherapy or ulcerative colitis receiving immunosuppressive agents.

However, CMV colitis is increasingly recognized in immunocompetent hosts.

Notably, CMV colitis coexisting with Clostridium difficile infection (CDI) in apparently healthy individuals has been published in recent years, which could result in high morbidity and mortality.

CMV colitis is a rare but possible differential diagnosis in immunocompetent patients with abdominal pain, watery, or especially bloody diarrhea, which could be refractory to standard treatment for CDI. As a characteristic of CDI, however, pseudomembranous colitis may be only caused by CMV infection.

Real-time CMV-polymerase chain reaction (PCR) for blood and stool samples may be a useful and noninvasive diagnostic strategy to identify CMV infection when treatment of CDI eventually fails to show significant benefits. Quantitative CMV-PCR in mucosal biopsies may increase the diagnostic yield of traditional histopathology.

CMV colitis is potentially life-threatening if severe complications occur, such as sepsis secondary to colitis, massive colorectal bleeding, toxic megacolon, and colonic perforation, so that may necessitate pre-emptive antiviral treatment for those who are positive for CMV-PCR in blood and/or stool samples while pending histological diagnosis

PDF

http://www.e-jmii.com/article/S1684-1182(16)00008-6/pdf

November 29, 2016 at 7:54 am

Older Posts


Calendar

February 2017
M T W T F S S
« Jan    
 12345
6789101112
13141516171819
20212223242526
2728  

Posts by Month

Posts by Category