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https://www.readbyqxmd.com/read/28898517/characterization-of-the-functional-activity-of-botulinum-neurotoxin-subtype-b6
#1
Tomoko Kohda, Keiji Nakamura, Koji Hosomi, Yasushi Torii, Shunji Kozaki, Masafumi Mukamoto
Clostridium botulinum produces the highly potent neurotoxin, botulinum neurotoxin (BoNT), which is classified into seven serotypes, A-G, and the subtype classification is confirmed by the diversity of the amino acid sequence among the serotypes. The BoNT from the Osaka05 strain is associated with type B infant botulism and has been divided into BoNT/B subtype B6 (BoNT/B6) by phylogenetic analysis and the antigenicity of its C-terminal heavy chain (HC) domain. However, the molecular basis for its properties, including the potency, is poorly understood...
September 12, 2017: Microbiology and Immunology
https://www.readbyqxmd.com/read/28888640/a-bovine-botulism-outbreak-associated-with-a-suspected-cross-contamination-from-a-poultry-farm
#2
R Souillard, C Le Maréchal, V Ballan, F Mahé, M Chemaly, S Le Bouquin
In October 2014, an outbreak of botulism type D/C occurred on two cattle farms in close proximity. A poultry farm located nearby with no history of botulism had transferred poultry manure to both bovine farms before the beginning of the outbreak. Given this context, epidemiological investigation was conducted to determine if the poultry farm was a reservoir of C. botulinum type D/C and to identify the source of contamination on the cattle farms. Environmental samples were collected at three houses on the poultry farm (boot swabs from the surroundings, swabs from the ventilation system, boot swabs from the poultry litter and darkling beetles samples), and on the two cattle farms (silage samples, boot swabs from the cattle stalls, boot swabs from the cattle pasture and poultry manure samples)...
September 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28879524/uptake-of-clostridial-neurotoxins-into-cells-and-dissemination
#3
Chloé Connan, Michel R Popoff
Clostridial neurotoxins, botulinum neurotoxins (BoNT) and tetanus neurotoxin (TeNT), are potent toxins, which are responsible for severe neurological diseases in man and animals. BoNTs induce a flaccid paralysis (botulism) by inhibiting acetylcholine release at the neuromuscular junctions, whereas TeNT causes a spastic paralysis (tetanus) by blocking the neurotransmitter release (glycine, GABA) in inhibitory interneurons within the central nervous system. Clostridial neurotoxins recognize specific receptor(s) on the target neuronal cells and enter via a receptor-mediated endocytosis...
September 7, 2017: Current Topics in Microbiology and Immunology
https://www.readbyqxmd.com/read/28874241/infant-botulism-in-denmark-from-1995-to-2015
#4
Bergitte Drivenes, Tyra Grove Krause, Mikael Andersson, Luise Müller, Kurt Fuursted, Tanja Pedersen, Anne Kirkeby Hansen, Malene Landbo Børresen
INTRODUCTION: Infant botulism is a rare, probably underdiagnosed, life-threatening disease caused by the toxin-producing bacterium Clostridium botulinum. METHODS: We investigated reported cases of infant botulism in Denmark from 1995 to 2015, and compared the incidence with that of other western countries. RESULTS: We found nine cases of infant botulism in Denmark from 1995 to 2015. The incidence of infant botulism in Denmark was similar to that seen in other western countries, but likely underestimated...
September 2017: Danish Medical Journal
https://www.readbyqxmd.com/read/28869522/recombinant-botulinum-neurotoxin-hc-subunit-bont-hc-and-catalytically-inactive-clostridium-botulinum-holoproteins-cibont-hps-as-vaccine-candidates-for-the-prevention-of-botulism
#5
Robert P Webb, Theresa J Smith, Leonard A Smith, Patrick M Wright, Rebecca L Guernieri, Jennifer L Brown, Janet C Skerry
There are few available medical countermeasures against botulism and the discontinuation of the pentavalent botulinum toxoid vaccine by the Centers for Disease Control and Prevention in 2011 has resulted in the need for a safe and effective prophylactic alternative. Advances in genetic engineering have resulted in subsequent vaccine efforts being primarily focused on the production of highly purified recombinant protein antigens representing one or more domains of the botulinum neurotoxin. Recombinant subunit vaccines based on the carboxy one-third of the toxin (Hc) developed in our lab against serotypes A-F have been shown to be safe and effective...
September 3, 2017: Toxins
https://www.readbyqxmd.com/read/28869493/vaccines-against-botulism
#6
REVIEW
Grace Sundeen, Joseph T Barbieri
Botulinum neurotoxins (BoNT) cause the flaccid paralysis of botulism by inhibiting the release of acetylcholine from motor neurons. There are seven serotypes of BoNT (A-G), with limited therapies, and no FDA approved vaccine for botulism. An investigational formalin-inactivated penta-serotype-BoNT/A-E toxoid vaccine was used to vaccinate people who are at high risk of contracting botulism. However, this formalin-inactivated penta-serotype-BoNT/A-E toxoid vaccine was losing potency and was discontinued. This article reviews the different vaccines being developed to replace the discontinued toxoid vaccine...
September 2, 2017: Toxins
https://www.readbyqxmd.com/read/28850968/-botulism-diagnosis-and-therapy
#7
REVIEW
Sebastian Wendt, Ines Eder, Roman Wölfel, Peggy Braun, Norman Lippmann, Arne Rodloff
Background Botulism is a rare, life-threatening, time-critical neuroparalytic disease that is frequently a subject of differential diagnostic considerations. But there is much uncertainty regarding diagnosis and therapy. Rapid diagnosis, early antitoxin dose, consistent food hygiene and the sensitization of the population can help to reduce incidence, morbidity and mortality. Methods This overview is based on an epidemiological data inquiry (RKI, ECDC, CDC, WHO) and a selective literature research (pubmed till March 2017)...
September 2017: Deutsche Medizinische Wochenschrift
https://www.readbyqxmd.com/read/28840718/detection-and-quantification-of-biologically-active-botulinum-neurotoxin-serotypes-a-and-b-using-a-f%C3%A3-rster-resonance-energy-transfer-based-quantum-dot-nanobiosensor
#8
Yun Wang, H Christopher Fry, Guy E Skinner, Kristin M Schill, Timothy V Duncan
Botulinum neurotoxin (BoNT) is the most potent toxin known. The ingestion of food contaminated with biologically active BoNT causes foodborne botulism, which can lead to respiratory paralysis, coma, and death after ingestion of as little as 70 μg for a 70 kg human. Because of its lethality and challenges associated with current detection methods, there is an urgent need for highly sensitive rapid screening techniques capable of detecting biologically active BoNT. Here, we describe a Förster resonance energy transfer-based nanobiosensor that uses quantum dots (QDs) and two specific quencher-labeled peptide probes to detect and differentiate two biologically active forms of BoNT, serotypes A and B, which were responsible for 80% of human foodborne botulism cases in the U...
September 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28839036/genome-sequence-of-clostridium-botulinum-strain-adk2012-associated-with-a-foodborne-botulinum-case-in-tottori-japan-in-2012
#9
Hiroshi Asakura, Shiori Yamamoto, Yoshika Momose, Haru Kato, Masaaki Iwaki, Keigo Shibayama
We report here a draft genome sequence of Clostridium botulinum Adk2012 responsible for a foodborne botulism case that occurred in Tottori, Japan, in 2012. Its genome size was 2,904,173 bp, with 46 rRNAs and 54 tRNAs, at a coverage of 14.5×.
August 24, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28816652/reoccurrence-of-botulinum-neurotoxin-subtype-a3-inducing-food-borne-botulism-slovakia-2015
#10
Lucia Mad'arová, Brigitte G Dorner, Lars Schaade, Vladimír Donáth, Mária Avdičová, Milota Fatkulinová, Jozef Strhársky, Ivana Sedliačiková, Cyril Klement, Martin B Dorner
A case of food-borne botulism occurred in Slovakia in 2015. Clostridium botulinum type A was isolated from three nearly empty commercial hummus tubes. The product, which was sold in Slovakia and the Czech Republic, was withdrawn from the market and a warning was issued immediately through the European Commission's Rapid Alert System for Food and Feed (RASFF). Further investigation revealed the presence of botulinum neurotoxin (BoNT) subtype BoNT/A3, a very rare subtype implicated in only one previous outbreak (Loch Maree in Scotland, 1922)...
August 10, 2017: Euro Surveillance: Bulletin Européen sur les Maladies Transmissibles, European Communicable Disease Bulletin
https://www.readbyqxmd.com/read/28811887/lessons-from-the-t%C3%A5-hoku-tsunami-a-model-for-island-avifauna-conservation-prioritization
#11
Michelle H Reynolds, Paul Berkowitz, John L Klavitter, Karen N Courtot
Earthquake-generated tsunamis threaten coastal areas and low-lying islands with sudden flooding. Although human hazards and infrastructure damage have been well documented for tsunamis in recent decades, the effects on wildlife communities rarely have been quantified. We describe a tsunami that hit the world's largest remaining tropical seabird rookery and estimate the effects of sudden flooding on 23 bird species nesting on Pacific islands more than 3,800 km from the epicenter. We used global positioning systems, tide gauge data, and satellite imagery to quantify characteristics of the Tōhoku earthquake-generated tsunami (11 March 2011) and its inundation extent across four Hawaiian Islands...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28807621/antitoxin-therapy-of-natural-avian-botulism-outbreaks-occurred-in-brazil
#12
Rodrigo O S Silva, Sandra Y M Gómez, Lilian B Medeiros, Marcus V R Marques, Aila S G Silva, Elisabeth N Mureb, Carlos A Oliveira Junior, Samantha M Favoretto, Francisco C F Lobato, Nelson R S Martins
Botulism commonly affects water birds and it has recently been observed to be emerging in poultry production. In the present work, outbreaks of botulism in wild native species, such as the black-fronted Piping-guan (Aburria jacutinga), wild duck (Cairina moschata) and its crosses with mallard (Anas platyrhynchos), and domestic chickens (Gallus gallus domesticus) are described. Following treatments with a commercial botulism antitoxin CD, 28 (96.5%) out of 29 animals fully recovered after 24-72 h. The antitoxin therapy was shown to be a useful option for the treatment of affected birds, including those that were severely affected...
August 12, 2017: Anaerobe
https://www.readbyqxmd.com/read/28802703/identification-and-characterization-of-clostridium-botulinum-group-iii-field-strains-by-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-maldi-tof-ms
#13
Luca Bano, Ilenia Drigo, Elena Tonon, Simone Pascoletti, Cinzia Puiatti, Fabrizio Anniballi, Bruna Auricchio, Florigio Lista, Cesare Montecucco, Fabrizio Agnoletti
Animal botulism is primarily due to botulinum neurotoxin (BoNT) types C, D or their chimeric variants C/D or D/C, produced by Clostridium botulinum group III, which appears to include the genetically indistinguishable Clostridium haemolyticum and Clostridium novyi. In the present study, we used matrix-assisted laser desorption-ionization time-of-flight mass spectrometry (MALDI TOF MS) to identify and characterize 81 BoNT-producing Clostridia isolated in 47 episodes of animal botulism. The instrument's default database, containing no entries for Clostridium botulinum, permitted reliable identification of 26 strains at the genus level...
August 10, 2017: Anaerobe
https://www.readbyqxmd.com/read/28800600/botulinum-neurotoxin-c-mutants-reveal-different-effects-of-syntaxin-or-snap-25-proteolysis-on-neuromuscular-transmission
#14
Giulia Zanetti, Stefan Sikorra, Andreas Rummel, Nadja Krez, Elisa Duregotti, Samuele Negro, Tina Henke, Ornella Rossetto, Thomas Binz, Marco Pirazzini
Botulinum neurotoxin serotype C (BoNT/C) is a neuroparalytic toxin associated with outbreaks of animal botulism, particularly in birds, and is the only BoNT known to cleave two different SNARE proteins, SNAP-25 and syntaxin. BoNT/C was shown to be a good substitute for BoNT/A1 in human dystonia therapy because of its long lasting effects and absence of neuromuscular damage. Two triple mutants of BoNT/C, namely BoNT/C S51T/R52N/N53P (BoNT/C α-51) and BoNT/C L200W/M221W/I226W (BoNT/C α-3W), were recently reported to selectively cleave syntaxin and have been used here to evaluate the individual contribution of SNAP-25 and syntaxin cleavage to the effect of BoNT/C in vivo...
August 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28785006/a-camelid-single-domain-antibody-neutralizes-botulinum-neurotoxin-a-by-blocking-host-receptor-binding
#15
Guorui Yao, Kwok-Ho Lam, Jasmin Weisemann, Lisheng Peng, Nadja Krez, Kay Perry, Charles B Shoemaker, Min Dong, Andreas Rummel, Rongsheng Jin
Antibody treatment is currently the only available countermeasure for botulism, a fatal illness caused by flaccid paralysis of muscles due to botulinum neurotoxin (BoNT) intoxication. Among the seven major serotypes of BoNT/A-G, BoNT/A poses the most serious threat to humans because of its high potency and long duration of action. Prior to entering neurons and blocking neurotransmitter release, BoNT/A recognizes motoneurons via a dual-receptor binding process in which it engages both the neuron surface polysialoganglioside (PSG) and synaptic vesicle glycoprotein 2 (SV2)...
August 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28783115/a-novel-surface-plasmon-resonance-biosensor-for-the-rapid-detection-of-botulinum-neurotoxins
#16
Kruti Patel, Shmuel Halevi, Paul Melman, John Schwartz, Shuowei Cai, Bal Ram Singh
Botulinum neurotoxins (BoNTs) are Category A agents on the NIAID (National Institute of Allergy and Infectious Diseases) priority pathogen list owing to their extreme toxicity and the relative ease of production. These deadly toxins, in minute quantities (estimated human i.v. lethal dose LD50 of 1-2 ng/kg body weight), cause fatal flaccid paralysis by blocking neurotransmitter release. The current gold standard detection method, the mouse-bioassay, often takes days to confirm botulism. Furthermore, there are no effective antidotes known to reverse the symptoms of botulism, and as a result, patients with severe botulism often require meticulous care during the prolonged paralytic illness...
August 7, 2017: Biosensors
https://www.readbyqxmd.com/read/28765793/infant-botulism-in-the-very-young-neonate-a-case-series
#17
Laura Jackson, Suneeta Madan-Khetarpal, Monica Naik, Marian G Michaels, Melissa Riley
Background  Though botulism is a rare disease overall, all infants younger than 1 year of age are at risk of contracting infant botulism, the most prevalent form reported in the United States. Nonetheless, infant botulism is frequently omitted from the differential diagnosis of the very young neonate exclusively due to age, and the diagnosis is often only considered secondarily after a costly and prolonged work up is undertaken. Delayed diagnosis can lead not only to unnecessary testing but also to prolonged hospital stay and increased morbidity...
July 2017: American Journal of Perinatology Reports
https://www.readbyqxmd.com/read/28742188/sp%C3%A3-dbarnsbotulism-%C3%A2-sk%C3%A3-l-att-inte-ge-honung-till-barn-under-ett-%C3%A3-r
#18
Sverre Wikström, Elisabet Holst
Infant botulism - why honey should be avoided for children up to one year Infant botulism means that Clostridium botulinum colonize and produce toxin in the infant gut, usually during the first year of life. Illness severity varies widely and the incidence may be under-estimated. Infant botulism should be considered in cases of acute muscle weakness or floppiness in infants, especially when accompanied by constipation or feeding difficulties. Respiratory failure and need for mechanical ventilation is common, but full recovery is gradually obtained...
July 24, 2017: Läkartidningen
https://www.readbyqxmd.com/read/28733282/differentiating-botulinum-neurotoxin-producing-clostridia-with-a-simple-multiplex-pcr-assay
#19
Charles H D Williamson, Adam J Vazquez, Karen Hill, Theresa J Smith, Roxanne Nottingham, Nathan E Stone, Colin J Sobek, Jill H Cocking, Rafael A Fernández, Patricia A Caballero, Owen P Leiser, Paul Keim, Jason W Sahl
Diverse members of the genus Clostridium produce botulinum neurotoxins (BoNTs), which cause a flaccid paralysis known as botulism. While multiple species of clostridia produce BoNTs, the majority of human botulism cases have been attributed to Clostridium botulinum groups I and II. Recent comparative genomic studies have demonstrated the genomic diversity within these BoNT-producing species. This report introduces a multiplex PCR assay for differentiating members of C. botulinum group I, C. sporogenes, and two major subgroups within C...
September 15, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28730326/infectious-diseases-causing-autonomic-dysfunction
#20
REVIEW
Francisco Javier Carod Artal
OBJECTIVES: To review infectious diseases that may cause autonomic dysfunction. METHODS: Review of published papers indexed in medline/embase. RESULTS: Autonomic dysfunction has been reported in retrovirus (human immunodeficiency virus (HIV), human T-lymphotropic virus), herpes viruses, flavivirus, enterovirus 71 and lyssavirus infections. Autonomic dysfunction is relatively common in HIV-infected patients and heart rate variability is reduced even in early stages of infection...
July 20, 2017: Clinical Autonomic Research: Official Journal of the Clinical Autonomic Research Society
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