ARISTIDES ALFREDO VARA HORNA PDF

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Streptococcus pneumoniae urinary tract infection in pedeatrics. Streptococcus pneumoniae infections in children are most often lung infections or meningitis. Urinary tract infections are much rarer. We present the case of a urinary aristidew infection with Streptococcus pneumoniae. The clinical picture was classical. The literature mentions a few cases of such infections. Those children mostly present abnormalities of urinary tract. In our case, urinary ultrasound scan have shown the presence of an ectopic kidney in this child.

The discussion between the clinician and the biologist has contributed to the discovery of this renal anomaly. Regulation of neuraminidase expression in Streptococcus pneumoniae. Background Sialic acid N-acetylneuraminic acid; NeuNAc is one of the most important carbohydrates for Streptococcus pneumoniae due of its role as a carbon and energy source, receptor for adhesion and invasion and molecular signal for promotion of biofilm formation, nasopharyngeal carriage and invasion of the lung.

Arístides Alfredo Vara Horna | Instituto de Investigación

Results In this work, NeuNAc and its metabolic derivative N-acetyl mannosamine ManNAc were used to analyze regulatory mechanisms of the neuraminidase locus expression. Genomic and metabolic comparison to Streptococcus mitis, Streptococcus oralis, Streptococcus gordonii and Streptococcus sanguinis elucidates the metabolic association of the two amino sugars to different parts of the locus coding for the two main pneumococcal neuraminidases and confirms the substrate specificity of the respective ABC transporters.

Quantitative gene expression analysis shows repression of the locus by glucose and induction of all predicted transcriptional units by ManNAc and NeuNAc, each inducing with higher efficiency the operon encoding for the transporter with higher specificity for the respective amino sugar. Cytofluorimetric analysis demonstrated enhanced surface exposure of NanA on pneumococci grown in NeuNAc and ManNAc and an activity assay allowed to quantify approximately twelve times as much neuraminidase activity on induced cells as opposed to glucose grown cells.

Conclusions The present data increase the understanding of metabolic regulation of the nanAB locus and indicate that experiments aimed at the elucidation of the relevance of neuraminidases in pneumococcal virulence should possibly not be carried out on bacteria grown in glucose containing media.

Rapid detection of Streptococcus pneumoniae by real-time fluorescence loop-mediated isothermal amplification.

Background and aim of study A significant human pathogenic bacterium, Streptococcus pneumoniae was recognized as a major cause of pneumoniaand is the subject of many humoral jorna studies. Diagnosis is generally made based on clinical suspicion along with a positive culture from a sample from virtually any place in the body. But the testing time is too long. This study is to establish a rapid diagnostic method to identification of Streptococcus pneumoniae.

Methods Our laboratory has recently developed a new platform called real-amp, which combines loop-mediated isothermal amplification LAMP with a portable tube scanner real-time isothermal instrument for the rapid detection of Streptococcus pneumonia. Two pairs of amplification primers required for this method were derived from a conserved DNA sequence unique to the Streptococcus pneumoniae.

Investigadores

The amplification hornx carried out at 63 degree Celsius using SYBR Green for 60 minutes with the tube scanner set to collect fluorescence signals. Clinical samples of Streptococcus pneumoniae and other bacteria were used to determine the sensitivity and specificity of the primers by comparing aristidees traditional culture method. Results The new set of primers consistently detected in laboratory-maintained isolates of Streptococcus pneumoniae from our hospital.

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The new primers also proved to be more sensitive than the published species-specific primers specifically developed for the LAMP method in detecting Streptococcus pneumoniae. Conclusions This study demonstrates that the Streptococcus pneumoniae LAMP primers developed here have the ability to accurately detect Streptococcus pneumoniae infections by real-time fluorescence LAMP. Monoclonal Idiotope Vaccine against Streptococcus pneumoniae Infection.

Vaccinated mice developed a high titer of antibody to phosphorylcholine, which is known to protect against infection with Streptococcus pneumoniae. Antibody to an idiotope can thus be used as an antigen substitute for the induction of aldredo immunity. Acanthamoeba castellanii interactions with Streptococcus pneumoniae and Streptococcus pyogenes.

Among the genus StreptococcusS. Antibacterial disinfectants have been partially effective only, indicating the need for novel preventative measures and to understand mechanisms of bacterial resistance. Acanthamoeba is a free-living protist that is known to harbour microbial pathogens, provide shelter, and assist in their transmission to susceptible population. The overall aim of this study was to determine whether S.

It was observed that both S. As Acanthamoeba cysts are resilient and can disperse through the air, A. In addition, these interactions may contribute to S. How Does Streptococcus pneumoniae Invade the Brain? Streptococcus pneumoniae the pneumococcus is the major cause of bacterial meningitis.

The mechanisms by which pneumococci from the bloodstream penetrate the blood-brain barrier to reach the brain are not fully understood. Receptor-mediated adhesion of the bacteria to the brain endothelium is considered a key event leading to meningitis development.

The aim of this review is to discuss recent advances and perspectives related to the interactions of S. Altogether, the available data suggest that, by precisely defining the pathways and ligands by which S. Streptococcus pneumoniae and Pseudomonas aeruginosa pneumonia induce distinct host responses. Michael; Dixon, David J.

Perren; Buchman, Timothy G. Objective Pathogens that cause pneumonia may be treated in a targeted fashion by antibiotics, but if this therapy fails, treatment involves only non-specific supportive measures, independent of the inciting infection. The purpose of this study was to determine whether host response is similar following disparate infections with similar mortalities. Design Prospective, randomized controlled study.

Setting Animal laboratory in a university medical center. Plasma and bronchoalveolar lavage fluid from septic animals was assayed by a microarray immunoassay measuring 18 inflammatory mediators at multiple timepoints.

Measurements and Main Results The host response was dependent upon the causative organism as well as kinetics of mortality, but the pro- and anti- inflammatory response was independent of inoculum concentration or degree of bacteremia.

Pneumonia caused by different concentrations of the same bacteria, Pseudomonas aeruginosa, also yielded distinct inflammatory responses; however, inflammatory mediator expression did not directly track the severity of infection.

For all infections, the host response was compartmentalized, with markedly different concentrations of inflammatory mediators in the systemic circulation and the lungs. Hierarchical clustering analysis resulted in the identification of 5 distinct clusters of the host response to bacterial infection. Conclusions Septic mice have distinct local and systemic responses to Streptococcus pneumoniae and Pseudomonas aeruginosa pneumonia.

Targeting specific host inflammatory responses induced by distinct bacterial infections could represent a potential therapeutic. Pathogens that cause pneumonia may be treated in a targeted fashion by antibiotics, but if this therapy fails, then treatment involves only nonspecific supportive measures, independent of the inciting infection.

The purpose of this study was to determine whether host response is similar after disparate infections with similar mortalities. Prospective, randomized controlled study. Animal laboratory in a university medical center.

Plasma and bronchoalveolar lavage fluid from septic animals was assayed by a microarray immunoassay measuring 18 inflammatory mediators at multiple time points. The host response was dependent on the causative organism as well as kinetics aristidex mortality, but the pro-inflammatory and anti-inflammatory responses were independent of inoculum concentration or degree of bacteremia. Hierarchical clustering analysis resulted in the identification of five distinct clusters of the host response to bacterial infection.

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Septic mice have distinct local and systemic responses to Streptococcus pneumoniae and Pseudomonas aeruginosa pneumonia. Targeting specific host inflammatory responses induced by distinct bacterial infections could represent a. Global antibiotic resistance in Streptococcus pneumoniae. The last two decades of the 20th century were marked by an increasing resistance rate among several bacteria. Threat of resistance is present in Staphylococcus spp.

In the community, too, increasing resistance can be observed and is alfredi mainly but not exclusively to Streptococcus pneumoniae and Haemophilus influenzae.

To scrutinize this trend, resistance surveillance in the community was vaara about apfredo years ago. Vaga of the multinational, longitudinal surveillance programmes in place is the Alexander Project, which was established in to monitor the susceptibility of the major community-acquired lower respiratory tract pathogens to a range aristidex antibacterial drugs. The Alexander Project has revealed a tendency towards increasing resistance wlfredo S.

Within Europe, the prevalence of penicillin resistance among S. Macrolide resistance in S. Export requirements of pneumolysin in Streptococcus pneumoniae. Streptococcus pneumoniae is a major causative agent of otitis media, pneumoniabacteremia, and meningitis. Pneumolysin Plya member of the cholesterol-dependent cytolysins CDCsis produced by virtually all clinical isolates of S.

In contrast to all other known members of the CDC family, Ply lacks a signal peptide for export outside the cell. Instead, Ply has been hypothesized to be released upon autolysis or, alternatively, via a nonautolytic mechanism that remains undefined. We show that an exogenously added signal sequence is not sufficient for Sec-dependent Ply secretion in S. Previously, we showed that Ply is localized primarily to the cell wall compartment in the absence of detectable cell lysis.

Here we show that Ply released by autolysis cannot reassociate with intact cells, suggesting that there is a Ply export mechanism that is coupled to cell wall aristkdes of the protein. This putative export mechanism is capable of secreting a related CDC without its signal sequence. We show that B. Finally, through truncation and domain swapping analyses, we show that export is dependent on domain 2 of Ply.

Export Requirements of Pneumolysin in Streptococcus pneumoniae. Description of Streptococcus pneumoniae Infections in Burn Patients. Glasser a, Michael L. Chung a,d, Duane R Although Streptococcus pneumoniae infections are common in the community ariwtides can cause nosocomial infectionsthe incidence and We performed an electronic retrospective chart review to collect rates. Screening of binding activity of Streptococcus pneumoniaeStreptococcus agalactiae and Streptococcus suis to berries and juices.

Antiadhesion therapy is a promising approach to the fight against pathogens. Antibiotic resistance and the lack of effective vaccines have increased the search for new methods to horha infectious diseases.

Previous studies have shown the antiadhesion activity of juice from cultivated cranberries Vaccinium macrocarpon Ait. In this study, the binding of two streptococcal strains, Streptococcus pneumoniae and Streptococcus agalactiae, to molecular size fractions FI, FII and Alfreeo, kDa, respectively of berries and berry and fruit juices from 12 plant species were studied using a microtiter well assay.