• Bacitracin and gramicidin

      Murk, JL; Kluytmans, J (2018-12-04)
    • Background incidence rates of adverse pregnancy outcomes in the Netherlands: Data of 2006-2018.

      Immink, Maarten M; Koole, Sanne; Bekker, Mireille N; Groenendaal, Floris; Kemmeren, Jeanet M; de Melker, Hester E; van der Maas, Nicoline A T (2020-11-25)
    • Bacterial and Parasitic Pathogens as Risk Factors for Cancers in the Gastrointestinal Tract: A Review of Current Epidemiological Knowledge.

      Duijster, Janneke W; Franz, Eelco; Neefjes, Jacques; Mughini-Gras, Lapo (2021-12-08)
      The oncogenic potential of viral infections is well established and documented for many years already. However, the contribution of (commensal) bacteria and parasites to the development and progression of cancers has only recently gained momentum, resulting in a rapid growth of publications on the topic. Indeed, various bacteria and parasites have been suggested to play a role in the development of gastrointestinal cancer in particular. Therefore, an overview of the current epidemiological knowledge on the association between infections with bacteria and parasites and cancers of the gastrointestinal tract is needed. In this review, we summarized the methodological characteristics and main results of epidemiological studies investigating the association of 10 different bacteria (Bacteroides fragilis, Campylobacter spp., Clostridium spp., Enterococcus faecalis, Escherichia coli, Fusobacterium nucleatum, Porphyromonas gingivalis, non-typhoidal Salmonella, Salmonella Typhi, and Streptococcus spp.) and three parasites (Cryptosporidium spp., Schistosoma spp., and Strongyloides stercoralis) with gastrointestinal cancer. While the large body of studies based on microbiome sequencing provides valuable insights into the relative abundance of different bacterial taxa in cancer patients as compared to individuals with pre-malignant conditions or healthy controls, more research is needed to fulfill Koch's postulates, possibly making use of follow-up data, to assess the complex role of bacterial and parasitic infections in cancer epidemiology. Studies incorporating follow-up time between detection of the bacterium or parasite and cancer diagnosis remain valuable as these allow for estimation of cause-effect relationships.
    • Bacterial DNAemia in older subjects and nonagenarian offspring and association with redox biomarkers: results from MARK-AGE Study.

      Giacconi, Robertina; D'Aquila, Patrizia; Malavolta, Marco; Piacenza, Francesco; Bürkle, Alexander; Moreno Villanueva, María; Dollé, Martijn E T; Jansen, Eugène; Grune, Tilman; Gonos, Efstathios S; et al. (2022-08-02)
    • Bacteriën als wapen

      Vries MC de; Voordouw BCG; Reubsaet FAG (2017-06)
    • Bacteriological and Immunological Profiling of Meconium and Fecal Samples from Preterm Infants: A Two-Year Follow-Up Study.

      Gómez, Marta; Moles, Laura; Espinosa-Martos, Irene; Bustos, Gerardo; de Vos, Willem M; Fernández, Leónides; Rodríguez, Juan M; Fuentes, Susana; Jiménez, Esther (2017-11-27)
      An abnormal colonization pattern of the preterm gut may affect immune maturation and exert a long-term influence on the intestinal bacterial composition and host health. However, follow-up studies assessing the evolution of the fecal microbiota of infants that were born preterm are very scarce. In this work, the bacterial compositions of fecal samples, obtained from sixteen 2-year-old infants were evaluated using a phylogenetic microarray; subsequently, the results were compared with those obtained in a previous study from samples of meconium and feces collected from the same infants while they stayed in the neonatal intensive care unit (NICU). In parallel, the concentration of a wide range of cytokines, chemokines, growth factors and immunoglobulins were determined in meconium and fecal samples. Globally, a higher bacterial diversity and a lower interindividual variability were observed in 2-year-olds' feces, when compared to the samples obtained during their first days of life. Hospital-associated fecal bacteria, that were dominant during the NICU stay, seemed to be replaced, two years later, by genera, which are usually predominant in the healthy adult microbiome. The immune profile of the meconium and fecal samples differed, depending on the sampling time, showing different immune maturation statuses of the gut.
    • BAFF augments IgA2 and IL-10 production by TLR7/8 stimulated total peripheral blood B cells.

      den Hartog, Gerco; van Osch, Thijs L J; Vos, Martijn; Meijer, Ben; Savelkoul, Huub F J; van Neerven, R J Joost; Brugman, Sylvia (2017-09-17)
      Class-switching of B cells to IgA can be induced via both T-cell-dependent and T-cell-independent mechanisms. IgA is most predominantly produced mucosally and is important for combating infections and allergies. In contrast to mice, humans have two forms of IgA; IgA1 and IgA2 with diverse tissue distribution. In early life, IgA levels might be sub-optimal especially during the fall season when bacterial and viral infections are more common. Therefore, we investigated using human B cells whether T-cell-independent factors -promoting cell survival, class switching and immunoglobulin secretion- BAFF, APRIL, IL-10 and retinoic acid can boost IgA production in the context of viral or bacterial infection. To this end total and naive peripheral blood B cells were stimulated with these factors for 6 days in the presence or absence of TLR7/8 agonist R848 (mimicking viral infection) or TLR9 agonist CpG-ODN (mimicking bacterial infection). We show that BAFF significantly augments IgA2 production in TLR7/8 stimulated mature, but not naïve B cells. In addition, BAFF augments IL-10 production and viability in TLR7/8 and TLR9 stimulated mature B cells. These data warrant further investigation of its role in immune regulation both in the periphery and mucosal tissues in early life or during disease.
    • Barriers to payment reform: Experiences from nine Dutch population health management sites.

      de Vries, Eline F; Drewes, Hanneke W; Struijs, Jeroen N; Heijink, Richard; Baan, Caroline A (2019-09-23)
    • Baseline characteristics of the HAARLEM study: 100 male amateur athletes using anabolic androgenic steroids.

      Smit, D L; de Hon, O; Venhuis, B J; den Heijer, M; de Ronde, W (2019-10-30)
    • Baseline incidence of intussusception in early childhood before rotavirus vaccine introduction, the Netherlands, January 2008 to December 2012.

      Gadroen, Kartini; Kemmeren, Jeanet M; Bruijning-Verhagen, Patricia Cj; Straus, Sabine Mjm; Weibel, Daniel; de Melker, Hester E; Sturkenboom, Miriam Cjm (2017-06-22)
      Intussusception is a rare, potentially life-threatening condition in early childhood. It gained attention due to an unexpected association with the first rotavirus vaccine, RotaShield, which was subsequently withdrawn from the market. Across Europe, broad variations in intussusception incidence rates have been reported. This study provides a first estimate of intussusception incidence in young children in the Netherlands from 1 January 2008 to 31 December 2012, which could be used for future rotavirus safety monitoring. Our estimates are based on two different sources: electronic medical records from the primary healthcare database (IPCI), as well as administrative data from the Dutch hospital register (LBZ). The results from our study indicate a low rate of intussusception. Overall incidence rate in children < 36 months of age was 21.2 per 100,000 person-years (95% confidence interval (CI): 12.5-34.3) based on primary healthcare data and 22.6 per 100,000 person-years (95% CI: 20.9-24.4) based on hospital administrative data. The estimates suggest the upper and lower bound of the expected number of cases.
    • BasinBox: a generic multimedia fate model for predicting the fate of chemicals in river catchments

      Hollander, A; Huijbregts, M A J; Ragas, A M J; Meent, D van de (Springer, 2006-05-20)
      Multimedia fate models have proven to be very useful tools in chemical risk assessment and management. This paper presents BasinBox, a newly developed steady-state generic multimedia fate model for evaluating risks of new and existing chemicals in river basins. The model concepts, as well as the intermedia processes quantified in the model, are outlined, and an overview of the required input parameters is given. To test the BasinBox model, calculations were carried out for predicting the fate of chemicals in the river Rhine basin. This was done for a set of 3175 hypothetical chemicals and three emission scenarios to air, river water and cropland soils. For each of these hypothetical chemicals and emission scenarios the concentration ratio between the downstream area and the upstream area was calculated for all compartments. From these calculations it appeared that BasinBox predicts significant concentration differences between upstream and downstream areas of the Rhine river basin for certain types of chemicals and emission scenarios. There is a clear trend of increasing chemical concentrations in downstream direction of the river basin. The calculations show that taking into account spatial variability between upstream, midstream and downstream areas of large river basins can be useful in the predictions of environmental concentrations by multimedia fate models.
    • Bayesian based similarity assessment of nanomaterials to inform grouping

      Tsiliki, G; Ag Seleci, D; Zabeo, A; Basel, G; Hristozov, D; Peijenburg, W; et al. (2022-03-01)
    • Bayesian Binary Mixture Models as a Flexible Alternative to Cut-Off Analysis of ELISA Results, a Case Study of Seoul Orthohantavirus.

      Swart, Arno; Maas, Miriam; de Vries, Ankje; Cuperus, Tryntsje; Opsteegh, Marieke (2021-06-16)
    • BCG-induced trained immunity enhances acellular pertussis vaccination responses in an explorative randomized clinical trial.

      Gillard, Joshua; Blok, Bastiaan A; Garza, Daniel R; Venkatasubramanian, Prashanna Balaji; Simonetti, Elles; Eleveld, Marc J; Berbers, Guy A M; van Gageldonk, Pieter G M; Joosten, Irma; de Groot, Ronald; et al. (2022-02-17)
    • A bead-based suspension array for the detection of Salmonella antibodies in pig sera.

      van der Wal, Fimme J; Achterberg, René P; Maassen, Catharina B M (2018-07-27)
      Slaughter pigs are monitored for the presence of the zoonotic pathogen Salmonella, using both serology and bacteriology. ELISAs used to investigate pig herds are based on the detection of antibodies against components of the Salmonella cell envelope. Nearly all Salmonella isolates in food-producing animals are serovars of Salmonella enterica subspecies enterica, distributed over various serogroups as determined by the composition of their lipopolysaccharide (LPS). ELISAs for Salmonella serology are usually based on serogroup B and C1 LPS, often combined with serogroup D or E LPS. Although C2 LPS may improve serology, use of C2 LPS in a broad ELISA was never achieved.
    • Bedaquiline resistance: Its emergence, mechanism and prevention.

      Nguyen, Thi Van Anh; Anthony, Richard M; Bañuls, Anne-Laure; Vu, Dinh Hoa; Alffenaar, Jan-Willem C (2017-11-08)
      Bedaquiline, a new anti-tuberculosis drug, has already been used in more than 50 countries. The emergence of bedaquiline resistance is alarming, as it may result in the rapid loss of this new drug. This paper aims to review currently identified mechanisms of resistance, the emergence of bedaquiline resistance, and discuss strategies to delay the resistance acquisition. In vitro and clinical studies as well as reports from the compassionate use have identified the threat of bedaquiline resistance and cross-resistance with clofazimine, emphasizing the crucial need for the systematic surveillance of resistance. Currently known mechanisms of resistance include mutations within the atpE, Rv0678 and pepQ genes. The development of standardized drug susceptibility testing (DST) for bedaquiline is urgently needed.Understanding any target and non-target based mechanisms is essential to minimize the resistance development and treatment failure, help to develop appropriate DST for bedaquiline and genetic based resistance screening.
    • Beehive products as bioindicators of antimicrobial resistance contamination in the environment.

      Laconi, Andrea; Tolosi, Roberta; Mughini-Gras, Lapo; Mazzuccato, Matteo; Ferrè, Nicola; Capolongo, Francesca; Merlanti, Roberta; Piccirillo, Alessandra (2021-10-22)
      The use of antimicrobials in agricultural, veterinary and medical practice exerts selective pressure on environmental microbiota, promoting the emergence and spread of antimicrobial resistance (AMR), a global concern for the One Health Initiative Task Force (OHITF). Honeybees have been studied as bioindicators of AMR in the environment, but little is known about beehive products like honey and pollen. The aim of this study was to assess the prevalence of AMR genes (ARGs) in beehive products and investigated their origins. Specifically, possible associations between ARGs, microbiota and other characteristics of different honey and pollen samples, including country of origin, flower type, type of commercial distribution and environmental factors, such as land use, weather and composition of the environment surrounding the beehives were investigated. We found that beehive products harboured ARGs conferring resistance to β-lactams, macrolides, (fluoro)quinolones and polymyxins. Most samples possessed resistance to multiple antimicrobial classes, with honey and pollen showing similar ARG profiles. Even if Lactobacillus and Acinetobacter genera were common in the microbial communities of both honey and pollen, Bacillus, Clostridium, and Bombella defined honey microbiota, while Pseudomonas and Vibrio were enriched in pollen. ErmB and blaTEM-1 co-occurred with Lactobacillus and Fructobacillus, while positive associations between β-lactams and macrolides and anthropogenic environments (i.e. industrial and commercial areas and non-irrigated arable lands) were found. Altogether, our findings suggest that ARGs in honey and pollen might originate from the honeybee foraging environment, and that the beehive products can be used as bioindicators of the AMR environmental contamination.
    • Behavioural insights and the evolving COVID-19 pandemic.

      de Bruin, Marijn; Suk, Jonathan E; Baggio, Marianna; Blomquist, Sarah Earnshaw; Falcon, María; Forjaz, Maria João; Godoy-Ramirez, Karina; Leurs, Mariken; Rodriguez-Blazquez, Carmen; Romay-Barja, María; et al. (2022-05-09)
    • Beijing/W genotype Mycobacterium tuberculosis and drug resistance.

      Glynn, Judith R; Kremer, Kristin; Borgdorff, Martien W; Rodriguez, Mar Pujades; Soolingen, Dick van (2006-05-01)
      Beijing/W genotype Mycobacterium tuberculosis is widespread, may be increasing, and may have a predilection for drug resistance. Individual-level data on >29,000 patients from 49 studies in 35 countries were combined to assess the Beijing genotype's prevalence worldwide, trends over time and with age, and associations with drug resistance. We found 4 patterns for Beijing/W genotype tuberculosis (TB): 1) endemic, not associated with drug resistance (high level in most of East Asia, lower level in parts of the United States); 2) epidemic, associated with drug resistance (high level in Cuba, the former Soviet Union, Vietnam, and South Africa, lower level in parts of Western Europe); 3) epidemic but drug sensitive (Malawi, Argentina); and 4) very low level or absent (parts of Europe, Africa). This study confirms that Beijing/W genotype TB is an emerging pathogen in several areas and a predominant endemic strain in others; it is frequently associated with drug resistance.