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https://www.readbyqxmd.com/read/29455870/detection-and-incidence-of-bordetella-holmesii-in-respiratory-specimens-from-patients-with-pertussis-like-symptoms-in-new-south-wales-australia
#1
Winkie Fong, Verlaine Timms, Nadine Holmes, Vitali Sintchenko
Bordetella pertussis, the aetiological agent of whooping cough is routinely diagnosed by polymerase chain reaction (PCR) directed at IS481, an insertion sequence target also found in Bordetella holmesii. Recent reports have suggested that B. holmesii infections can be misdiagnosed as pertussis, which can have a significant impact on public health surveillance. This study investigated the presence of B. holmesii in B. pertussis positive clinical samples, in order to determine the incidence of B. holmesii. Clinical cases of pertussis diagnosed by IS481-specific PCR between October 2008 and March 2016 in New South Wales were included...
February 15, 2018: Pathology
https://www.readbyqxmd.com/read/29433898/construction-and-evaluation-of-bordetella-pertussis-live-attenuated-vaccine-strain-bpze1-producing-fim3
#2
Anne-Sophie Debrie, Loïc Coutte, Dominique Raze, Frits Mooi, Frances Alexander, Andrew Gorringe, Nathalie Mielcarek, Camille Locht
Pertussis or whooping cough is currently the most prevalent vaccine-preventable childhood disease despite >85% global vaccination coverage. In recent years incidence has greatly increased in several high-income countries that have switched from the first-generation, whole-cell vaccine to the newer acellular vaccines, calling for improved vaccination strategies with better vaccines. We have developed a live attenuated pertussis vaccine candidate, called BPZE1, which is currently in clinical development. Unlike other pertussis vaccines, BPZE1 has been shown to provide strong protection against infection by the causative agent of pertussis, Bordetella pertussis, in non-human primates...
February 9, 2018: Vaccine
https://www.readbyqxmd.com/read/29429812/bordetella-pertussis-bp-disease-before-2003-2011-and-after-2013-2016-maternal-immunization-strategy-in-a-pediatric-hospital
#3
Angela Gentile, María Del Valle Juarez, María Florencia Lucion, Ana Clara Martínez, Viviana Romanin, Soledad Areso, Alicia Mistchenko
INTRODUCTION: Whooping cough continues to be a major cause of morbidity and mortality in infants younger than 1 year. In 2012, Argentina introduced Tdap in pregnancy to prevent infant mortality. The aim of this study is to describe the impact of maternal immunization on the hospitalization and mortality rates of confirmed Bordetella pertussis (Bp) cases by comparing pre- and post-Tdap vaccine recommendation periods. MATERIAL AND METHODS: All PCR-confirmed Bp cases from "R...
February 8, 2018: Vaccine
https://www.readbyqxmd.com/read/29399582/outbreak-investigation-of-pertussis-in-an-elementary-school-a-case-control-study-among-vaccinated-students
#4
Sukhyun Ryu, Joon Jai Kim, Meng-Yu Chen, Hyunju Jin, Hyun Kyung Lee, Byung Chul Chun
Purpose: A pertussis patient from an elementary school, in Gyeonggi Province, Korea, was notified to public health authority on July 25, 2017. Epidemiologic investigation was conducted to identify the magnitude, possible source of infection and risk factors for this outbreak on August 17, 2017. Materials and Methods: A case was defined as the school student experiencing cough for more than two weeks with or without paroxysmal, whoop, or post-tussive vomiting. Control was defined as the student polymerase chain reaction-negative at the school...
January 2018: Clinical and Experimental Vaccine Research
https://www.readbyqxmd.com/read/29387937/a-systematic-approach-for-finding-the-objective-function-and-active-constraints-for-dynamic-flux-balance-analysis
#5
Ali Nikdel, Richard D Braatz, Hector M Budman
Dynamic flux balance analysis (DFBA) has become an instrumental modeling tool for describing the dynamic behavior of bioprocesses. DFBA involves the maximization of a biologically meaningful objective subject to kinetic constraints on the rate of consumption/production of metabolites. In this paper, we propose a systematic data-based approach for finding both the biological objective function and a minimum set of active constraints necessary for matching the model predictions to the experimental data. The proposed algorithm accounts for the errors in the experiments and eliminates the need for ad hoc choices of objective function and constraints as done in previous studies...
February 1, 2018: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/29346585/maternal-vaccination-with-a-mono-component-pertussis-toxoid-vaccine-is-sufficient-to-protect-infants-in-a-baboon-model-of-whooping-cough
#6
Parul Kapil, James F Papin, Roman F Wolf, Lindsey I Zimmerman, Leslie D Wagner, Tod J Merkel
Background: Bordetella pertussis is a human pathogen responsible for serious respiratory illness. The disease is most severe in infants too young to be vaccinated with most hospitalizations and deaths occurring within this age group. The Advisory Committee on Immunization Practices recommended immunization of pregnant women to protect infants from birth until their first vaccination at six to eight weeks of age. We previously demonstrated that maternal vaccination with licensed acellular pertussis vaccines protected newborn baboons from disease...
January 15, 2018: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29337218/calcium-dependent-disorder-to-order-transitions-are-central-to-the-secretion-and-folding-of-the-cyaa-toxin-of-bordetella-pertussis-the-causative-agent-of-whooping-cough
#7
Darragh P O'Brien, Ana Cristina Sotomayor Perez, Johanna Karst, Sara E Cannella, Véronique Yvette Ntsogo Enguéné, Audrey Hessel, Dorothée Raoux-Barbot, Alexis Voegele, Orso Subrini, Marilyne Davi, J Inaki Guijarro, Bertrand Raynal, Bruno Baron, Patrick England, Belen Hernandez, Mahmoud Ghomi, Véronique Hourdel, Christian Malosse, Julia Chamot-Rooke, Patrice Vachette, Dominique Durand, Sébastien Brier, Daniel Ladant, Alexandre Chenal
The adenylate cyclase toxin (CyaA) plays an essential role in the early stages of respiratory tract colonization by Bordetella pertussis, the causative agent of whooping cough. Once secreted, CyaA invades eukaryotic cells, leading to cell death. The cell intoxication process involves a unique mechanism of translocation of the CyaA catalytic domain directly across the plasma membrane of the target cell. Herein, we review our recent results describing how calcium is involved in several steps of this intoxication process...
January 11, 2018: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29306640/species-interactions-may-help-explain-the-erratic-periodicity-of-whooping-cough-dynamics
#8
Samit Bhattacharyya, Matthew J Ferrari, Ottar N Bjørnstad
Incidence of whooping cough exhibits variable dynamics across time and space. The periodicity of this disease varies from annual to five years in different geographic regions in both developing and developed countries. Many hypotheses have been put forward to explain this variability such as nonlinearity and seasonality, stochasticity, variable recruitment of susceptible individuals via birth, immunization, and immune boosting. We propose an alternative hypothesis to describe the variability in periodicity - the intricate dynamical variability of whooping cough may arise from interactions between its dominant etiological agents of Bordetella pertussis and Bordetella parapertussis...
December 14, 2017: Epidemics
https://www.readbyqxmd.com/read/29238457/molecular-detection-of-bordetella-holmesii-in-two-infants-with-pertussis-like-syndrome-the-first-report-from-iran
#9
Masoumeh Nakhost Lotfi, Vajiheh Sadat Nikbin, Omid Nasiri, Farzad Badmasti, Fereshteh Shahcheraghi
Background and Objectives: Bordetella holmesii is associated with a pertussis-like respiratory syndrome in healthy individuals and also a rare cause of septicaemia, endocarditis, pneumonia, and septic arthritis, mostly in immunocompromised patients. Culture technique and real-time PCR are 2 methods used to detect Bordetella spp. Materials and Methods: In this study, 435 nasopharyngeal specimens of patients with suspected whooping cough were checked for the presence of B...
August 2017: Iranian Journal of Microbiology
https://www.readbyqxmd.com/read/29235265/synthesis-of-%C3%AE-branched-acyclic-nucleoside-phosphonates-as-potential-inhibitors-of-bacterial-adenylate-cyclases
#10
Jan Frydrych, Jan Skácel, Markéta Šmídková, Helena Mertlíková-Kaiserová, Martin Dračínský, Ramachandran Gnanasekaran, Martin Lepšík, Monica Soto-Velasquez, Val J Watts, Zlatko Janeba
Inhibition of Bordetella pertussis adenylate cyclase toxin (ACT) and Bacillus anthracis edema factor (EF), the key virulence factors with adenylate cyclase (AC) activity, represents a potential method how to treat or prevent toxemia related to whooping cough and anthrax, respectively. A novel series of α-branched acyclic nucleoside phosphonates (ANPs) having a hemiaminal ether moiety was synthesized as potential inhibitors of bacterial adenylate cyclases. ANPs prepared as bisamidates were not cytotoxic but did not exhibited any profound activity (IC50 > 10 µM) towards ACT in J774A...
December 13, 2017: ChemMedChem
https://www.readbyqxmd.com/read/29223471/-clinical-epidemiological-study-of-bordetella-pertussis-infection-in-the-gran-canaria-island-in-the-period-2008-2016
#11
Laura Iglesias, Antonio Casabella Pernas, Melisa Hernández Febles, Elena Colino Gil, Alicia Eisman Maraver, María José Pena López
OBJECTIVE: Describe the epidemiological and clinical pattern of Bordetella pertussis infection (whooping cough) among hospitalised infants less than one year-old in a paediatric hospital in Gran Canaria. PATIENTS AND METHODS: A retrospective review of the patient hospital records was performed, and recording only those with a microbiological diagnosis of pertussis infection detected using polymerase chain reaction, from January 2008 to December 2016. RESULTS: A total of 110 patients were identified, of which 105 (95...
December 6, 2017: Anales de Pediatría: Publicación Oficial de la Asociación Española de Pediatría (A.E.P.)
https://www.readbyqxmd.com/read/29205108/contributions-of-the-hydrophobic-helix-2-of-the-bordetella-pertussis-cyaa-hemolysin-to-membrane-permeabilization
#12
Panchika Prangkio, Sirikran Juntapremjit, Melanie Koehler, Peter Hinterdorfer, Chanan Angsuthanasombat
Adenylate cyclase (CyaA) is one of the major virulence factors of Bordetella pertussis that plays a key role in whooping cough pathogenesis. A putative transmembrane helical hairpin (α2-loop-α3), encompassing residues 529-594 of CyaA hemolysin (CyaA-Hly) domain, was previously proposed to be crucially involved in hemolytic activity against target erythrocytes. Here, to gain more insight into membrane permeabilization of this toxin, synthetic peptides corresponding to this critical helical component, i.e. α2 (W528-G550), α3 (G568-R594) and α2-loop-α3 (W528-R594), were examined on various membrane models in comparison with the purified 130-kDa CyaA-Hly...
December 1, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/29203545/bordetella-pertussis-adenylate-cyclase-toxin-disrupts-functional-integrity-of-bronchial-epithelial-layers
#13
Shakir Hasan, Nikhil Nitin Kulkarni, Arni Asbjarnarson, Irena Linhartova, Radim Osicka, Peter Sebo, Gudmundur H Gudmundsson
Airway epithelium restricts penetration of inhaled pathogens into the underlying tissue and plays a crucial role in innate immune defense against respiratory infections. The whooping cough agent, Bordetella pertussis, adheres to ciliated cells of human airway epithelium and subverts its defense functions through the action of secreted toxins and other virulence factors. We have examined the impact of B. pertussis infection and of adenylate cyclase toxin (CyaA) action on the functional integrity of air-liquid interface (ALI)-cultured human bronchial epithelial cells...
December 4, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/29203497/outer-membrane-vesicles-omv-based-and-proteomics-driven-antigen-selection-identifies-novel-factors-contributing-to-bordetella-pertussis-adhesion-to-epithelial-cells
#14
Gianmarco Gasperini, Massimiliano Biagini, Vanessa Arato, Claudia Gianfaldoni, Alessandro Vadi, Nathalie Norais, Giuliano Bensi, Isabel Delany, Mariagrazia Pizza, Beatrice Aricò, Rosanna Leuzzi
Despite high vaccination coverage world-wide, whooping cough, a highly contagious disease caused by Bordetella pertussis, is recently increasing in occurrence suggesting that novel vaccine formulations targeted at the prevention of colonization and transmission should be investigated. In order to identify new candidates for inclusion in the acellular formulation, we used spontaneously released outer membrane vesicles (OMV) as a potential source of key adhesins. The enrichment of Bvg+ OMV with adhesins and the ability of anti-OMV serum to inhibit the adhesion of B...
December 4, 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/29182938/does-disease-cause-vaccination-disease-outbreaks-and-vaccination-response
#15
Emily Oster
Parental fear of vaccines has limited vaccination rates in the United States. I test whether disease outbreaks increase vaccination using a new dataset of county-level disease and vaccination data. I find that pertussis (whooping cough) outbreaks in a county decrease the share of unvaccinated children entering kindergarten. These responses do not reflect changes in the future disease risk. I argue that these facts are best fit by a model in which individuals are both myopic and irrational. This suggests that better promotion of information about outbreaks could enhance the response...
November 2, 2017: Journal of Health Economics
https://www.readbyqxmd.com/read/29176673/phosphoproteomics-of-camp-signaling-of-bordetella-adenylate-cyclase-toxin-in-mouse-dendritic-cells
#16
Jakub Novák, Ivo Fabrik, Irena Linhartová, Marek Link, Ondřej Černý, Jiří Stulík, Peter Šebo
The adenylate cyclase toxin (CyaA) of the whooping cough agent Bordetella pertussis subverts immune functions of host myeloid cells expressing the αMβ2 integrin (CD11b/CD18, CR3 or Mac-1). CyaA delivers into cytosol of cells an extremely catalytically active adenylyl cyclase enzyme, which disrupts the innate and adaptive immune functions of phagocytes through unregulated production of the key signaling molecule cAMP. We have used phosphoproteomics to analyze cAMP signaling of CyaA in murine bone marrow-derived dendritic cells...
November 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29166874/efficacy-and-safety-of-pertussis-vaccination-for-pregnant-women-a-systematic-review-of-randomised-controlled-trials-and-observational-studies
#17
Marie Furuta, Jacqueline Sin, Edmond S W Ng, Kay Wang
BACKGROUND: Worldwide, pertussis remains a major health problem among children. During the recent outbreaks of pertussis, maternal antenatal immunisation was introduced in several industrial countries. This systematic review aimed to synthesize evidence for the efficacy and safety of the pertussis vaccination that was given to pregnant women to protect infants from pertussis infection. METHODS: We searched literature in the Cochrane Central Register of Controlled Trials, Medline, Embase, and OpenGrey between inception of the various databases and 16 May 2016...
November 22, 2017: BMC Pregnancy and Childbirth
https://www.readbyqxmd.com/read/29164393/bordetella-pertussis-virulence-factors-in-the-continuing-evolution-of-whooping-cough-vaccines-for-improved-performance
#18
REVIEW
Dorji Dorji, Frits Mooi, Osvaldo Yantorno, Rajendar Deora, Ross M Graham, Trilochan K Mukkur
Despite high vaccine coverage, whooping cough caused by Bordetella pertussis remains one of the most common vaccine-preventable diseases worldwide. Introduction of whole-cell pertussis (wP) vaccines in the 1940s and acellular pertussis (aP) vaccines in 1990s reduced the mortality due to pertussis. Despite induction of both antibody and cell-mediated immune (CMI) responses by aP and wP vaccines, there has been resurgence of pertussis in many countries in recent years. Possible reasons hypothesised for resurgence have ranged from incompliance with the recommended vaccination programmes with the currently used aP vaccine to infection with a resurged clinical isolates characterised by mutations in the virulence factors, resulting in antigenic divergence with vaccine strain, and increased production of pertussis toxin, resulting in dampening of immune responses...
November 21, 2017: Medical Microbiology and Immunology
https://www.readbyqxmd.com/read/29158617/pertussis-outbreak-in-polish-shooters-with-adverse-event-analysis
#19
Monika Skrzypiec-Spring, Jarosław Krzywański, Monika Karlikowska-Skwarnik, Andrzej Pokrywka, Hubert Krysztofiak, Aneta Nitsch-Osuch, Ernest Kuchar
In addition to different injuries, infections are the most common reason for giving up training altogether or reducing its volume and intensity, as well as a lack of opportunities to participate in sports competitions. Nowadays, a slow but constant re-emergence of pertussis, especially among teenagers and young adults, including athletes, can be observed. This paper describes an outbreak of pertussis among professional Polish shooters, focusing on the transmission of Bordetella pertussis infection between members of the national team, its influence on performance capacity and adverse event analysis...
September 2017: Biology of Sport
https://www.readbyqxmd.com/read/29135925/membrane-active-properties-of-an-amphitropic-peptide-from-the-cyaa-toxin-translocation-region
#20
Alexis Voegele, Orso Subrini, Nicolas Sapay, Daniel Ladant, Alexandre Chenal
The adenylate cyclase toxin CyaA is involved in the early stages of infection by Bordetella pertussis, the causative agent of whooping cough. CyaA intoxicates target cells by a direct translocation of its catalytic domain (AC) across the plasma membrane and produces supraphysiological levels of cAMP, leading to cell death. The molecular process of AC translocation remains largely unknown, however. We have previously shown that deletion of residues 375-485 of CyaA selectively abrogates AC translocation into eukaryotic cells...
November 14, 2017: Toxins
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