Gabriel Alberto March Rosselló

Hospital Clínico Universitario de Valladolid · Department of microbiology

The dominant SARS-CoV-2 Delta variant (B.1.617.2) became the main circulating variant among countries by mid 2021. Attention was raised to the increased risk of airborne transmission, leading to nosocomial outbreaks even among vaccinated individuals. Considering the increased number of COVID-19 hospital admissions fueled by the spread of the varian...

Introduction Bacterial/fungal coinfection and superinfections contribute to the increased morbi-mortality of viral respiratory infections (RIs). The main objective of this study was to determine the incidence of these infections in hospitalized patients with COVID-19. Method Retrospective observational study of all patients admitted for COVID-19 a...

Background Recently, MALDI-TOF has emerged as a quick tool for bacterial typing. The aim was to evaluate if MALDI-TOF based typing of Legionella pneumophila can achieve the same discriminatory power as that of the Sequence Based Typing (SBT) method. Methods The Sequence Type (ST) was obtained from the 90 strains included in the training set and an...

Resumen Introducción: La coinfección/sobreinfección bacteriana/fúngica contribuye al incremento de la morbi-mortalidad de las infecciones respiratorias (IRs) virales. El objetivo de este trabajo es conocer la incidencia de estas infecciones en los pacientes hospitalizados por COVID-19. Método: Estudio retrospectivo observacional de todos los pacien...

Introduction: Currently, Matrix-Assisted Laser Desorption Ionization-Time of Flight Mass Spectrometry (MALDI-TOF MS) is being evaluated for its efficacy as a fast bacterial typing tool due to its great speed compared to other molecular methods. In this study, we evaluated MALDI-TOF as a tool for quick identification and typing of Francisella tular...

Purpose To perform epidemiological surveillance of Legionella pneumophila in recreational swimming pools in the city of Valladolid (Spain), an area with a continental climate and low incidence of legionella-associated infections. Additionally, wild-type minimum inhibitory concentration (MIC) distributions for eight antibiotics commonly used for the...

Purpose: To perform epidemiological surveillance of Legionella pneumophila in recreational swimming pools in the city of Valladolid (Spain), an area with a continental climate and low incidence of legionella-associated infections. Additionally, wild-type minimum inhibitory concentration (MIC) distributions for eight antibiotics commonly used for t...

The aim of this work was to ascertain the usefulness of a new commercially-available single-assay chemiluminescence test (CHT) for the diagnosis of human tularemia (Tularaemia VIRCLIA IgG + IgM monotest, Vircell, Santa Fe, Granada, Spain). A total of 773 sera from 773 patients including 364 initial sera from patients with diagnosed tularemia, patie...

The aims of this chapter are to provide insight into the field of cosmetic microbiology and expand knowledge of the general demands on the microbiological analysis of cosmetic products. Data about legislation in the United States and the European Union and the published harmonised standards for microbiological control of cosmetic products, before,...

The most widely used antibiotic susceptibility testing methods in Clinical Microbiology are based on the phenotypic detection of antibiotic resistance by measuring bacterial growth in the presence of the antibiotic being tested. These conventional methods take typically 24 h to obtain results. Here we review the main techniques for rapid determinat...

The most widely used antibiotic susceptibility testing methods in Clinical Microbiology are based on the phenotypic detection of antibiotic resistance by measuring bacterial growth in the presence of the antibiotic being tested. These conventional methods take typically 24hours to obtain results. Here we review the main techniques for rapid determi...

The overuse and misuse of antimicrobials contribute to the emergence of antibiotic-resistant bacteria. The aim of this work was to analyse all the anti-infectives for systemic use (J ATC group) prescribed at the University Clinic Hospital of Valladolid (Spain) for the years 2009-2013. Amounts of anti-infectives (antibacterials, antifungals and anti...

Las muestras de orina son las más frecuentemente procesadas en los laboratorios de microbiología clínica. Teniendo en cuenta que del 60 al 80% de las muestras proporcionan resultados negativos, es recomendable realizar un cribado de las orinas para disminuir los gastos y la carga de trabajo, y adelantar los resultados negativos. El objetivo del tra...

INTRODUCTION: Rapid determination of the antibiotic susceptibility test in bacteria remains a challenge for Clinical Microbiology laboratories.

The aim of the work was to describe the different in vitro models for testing synergism of antibiotics and gather the results of antibiotic synergy against multidrug-resistant Acinetobacter baumannii (MDR-Ab). The different original articles were obtained from different web sites. In order to compare the results obtained by the different methods fo...

Introduction: breast milk, besides being a source of feeding for children, it can be a vehicle for transmission of some infectious diseases. Aim: to revise the main viral agents which can be acquired for children through breast milk and its possible clinical implication. Material: literature search was made in different databases and books. R...

The antibiotic susceptibility test (AST) in Clinical Microbiology laboratories is still time-consuming, and most procedures take 24h to yield results. In this study, a rapid antimicrobial susceptibility test using ATP-bioluminescence has been developed. The design of method was performed using five ATCC collection strains of known susceptibility. T...

Resumen Los métodos más frecuentemente utilizados en Microbiología Clínica para la determinación de la sensibilidad de las bacterias a los antibióticos se basan en un estudio fenotípico, observando el crecimiento bacteriano de la cepa incubada en presencia del antibiótico a estudiar. Estos métodos requieren normalmente un tiempo de unas 24 h para l...

The most widely used antibiotic susceptibility testing methods in Clinical Microbiology are based on the phenotypic detection of antibiotic resistance by measuring bacterial growth in the presence of the antibiotic being tested. These conventional methods take typically 24hours to obtain results. A review is presented here of recently developed tec...

The rapid identification and antibiotic susceptibility test of bacteria causing bloodstream infections are given a very high priority by clinical laboratories. In an effort to reduce the time required for performing antibiotic susceptibility test (AST), we have developed a new method to be applied from positive blood culture bottles. The design of...

In Nature, no individual can live in isolation; hence, living organisms are forced to interact with each other. This necessity has led many organisms to establish heterogeneous relations to enhance their ability to adapt to the environment, thus acquiring evolutionary advantages. These relationships are sometimes so intense, that on the long term t...

Las infecciones virales nosocomiales han sido objeto de pocos estudios. En este contexto, el objetivo de este trabajo es revisar los datos epidemiológicos y terapéuticos publicados sobre los principales agentes virales productores de infección nosocomial respiratoria. De este modo se pretende ampliar el conocimiento sobre el comportamiento de estos...

Nosocomial viral infections have not been well studied. In this context, the aim of this work is to review epidemiological and therapeutic data published on the main viral agents that can produce nosocomial respiratory infection. The study thus aims to expand knowledge of behaviour of these agents in nosocomial infections and provide information to...

Matrix-Assisted Laser Desorption/Ionization-Time of Flight Mass Spectrometry is a widely used proteomic technique in clinical microbiology laboratories, and enables microbial identification directly from clinical samples. This study seeks to establish a protocol for bacterial identification from monomicrobial urine samples that have tested positive...

Bacterial sets are complex dynamic systems, which interact with each other and through the interaction, bacteria coexist, collaborate, compete and share information in a coordinated manner. A way of bacterial communication is quorum sensing. Through this mechanism the bacteria can recognize its concentration in a given environment and they can deci...

Matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry (MALDI-TOF) is a widely used tool in clinical microbiology for rapidly identifying microorganisms. This technique can be applied directly on positive blood cultures without the need for its culturing, thereby, reducing the time required for microbiological diagnosis. The p...