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https://www.readbyqxmd.com/read/28398677/preparing-for-biological-threats-addressing-the-needs-of-pregnant-women
#1
REVIEW
Amelia K Watson, Sascha Ellington, Christina Nelson, Tracee Treadwell, Denise J Jamieson, Dana M Meaney-Delman
Intentional release of infectious agents and biological weapons to cause illness and death has the potential to greatly impact pregnant women and their fetuses. We review what is known about the maternal and fetal effects of seven biological threats: Bacillus anthracis (anthrax); variola virus (smallpox); Clostridium botulinum toxin (botulism); Burkholderia mallei (glanders) and Burkholderia pseudomallei (melioidosis); Yersinia pestis (plague); Francisella tularensis (tularemia); and Rickettsia prowazekii (typhus)...
March 15, 2017: Birth Defects Res
https://www.readbyqxmd.com/read/28393685/immunoproteomics-approach-for-screening-vaccine-candidates-against-the-intestinal-botulism
#2
Arti Sharma, Sarkaraisamy Ponmariappam, Sarita Rani
Intestinal botulism is an infectious form of botulism in which disease results from ingesting spores, which is followed by spore germination and intraluminal production of botulinum neurotoxins over an extended period. Botulinum neurotoxin is produced by endospore forming bacteria called C. botulinum. The immunoproteomic is used to screen the cross reactive immunogenic proteins of C. botulinum type B using C. botulinum type B live spore antiserum. The whole cell proteins are separated by two dimensional gel electrophoresis and transferred to polyvinylidene difluoride membranes...
April 4, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28374597/-foodborne-botulism-a-re-emerging-public-health-challenge
#3
R Mezencev, C Klement
Human foodborne botulism is an intoxication caused by ingestion of botulinum neurotoxins (BoNT) of serotypes A, B, E, and rarely also serotype F, produced in contaminated food by anaerobic bacteria Clostridium botulinum group I, group II, or by toxigenic strains of C. butyricum and C. baratii. BoNT-producing Clostridia are ubiquitously distributed in the environment and, under suitable conditions, they can enter the food chain, proliferate and produce BoNT in a variety of foods. In the past, the risk of foodborne botulism was primarily associated with homemade canned foods; however, the epidemiological importance of commercial and restaurant food is increasing nowadays...
2017: Epidemiologie, Mikrobiologie, Imunologie
https://www.readbyqxmd.com/read/28360447/botulism-outbreak-in-a-family-after-ingestion-of-locally-produced-cheese
#4
Shahram Rafie, Shokrollah Salmanzadeh, Asieh Mehramiri, Adel Nejati
Botulism is one of the most important foodborne diseases and is caused by Clostridium botulinum toxin. The main manifestations are flaccid muscle paralysis and cranial nerve palsies. Botulism is an essential health problem because of its high mortality. The diagnosis of botulism, especially in sporadic cases, is a medical challenge and a high clinical suspicion is necessary for early recognition. So, every physician should be familiar with its signs and symptoms for early detection and treatment. We describe a family with dysphasia and acute paralysis after the ingestion of locally made cheese...
March 2017: Iranian Journal of Medical Sciences
https://www.readbyqxmd.com/read/28359137/an-ultrasensitive-gold-nanoparticle-based-lateral-flow-test-for-the-detection-of-active-botulinum-neurotoxin-type-a
#5
Jing Liu, Shan Gao, Lin Kang, Bin Ji, Wenwen Xin, Jingjing Kang, Ping Li, Jie Gao, Hanbin Wang, Jinglin Wang, Hao Yang
Botulism is a severe and potentially lethal paralytic disease caused by several botulinum neurotoxin-producing Clostridia spp. In China, the majority of the cases caused by botulism were from less-developed rural areas. Here, we designed specific substrate peptides and reconfigured gold nanoparticle-based lateral flow test strip (LFTS) to develop an endopeptidase-based lateral flow assay for the diagnosis of botulism. We performed this lateral flow assay on botulinum neurotoxin-spiked human serum samples. The as-prepared LFTS had excellent performance in the detection of botulinum neurotoxin using only 1 μL of simulated serum, and its sensitivity and specificity were comparable to that of mouse lethality assay...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28348769/clostridium-baratii-a-rare-case-of-pneumonia-associated-with-an-alzheimer-patient-in-rio-de-janeiro-brazil
#6
Carla Ormundo Gonçalves Ximenes Lima, Vinicius Magno da Rocha, Eliane de Oliveira Ferreira, Joaquim Santos Filho, Lucia Rodrigues Serradas, Rodrigo Otávio Silveira Silva, Francisco Carlos Faria Lobato, Regina Maria Cavalcanti Pilotto Domingues
INTRODUCTION: Clostridium baratii is rarely associated with human diseases. Infection is usuallcaused by ingestion of contaminated food, and infant botulism is the most common clinical presentation. CASE REPORT: Here we report a case of pneumonia by a non-toxigenic strain of C. baratii in an Alzheimer 70-year-old male with sepsis in Rio de Janeiro, Brazil. The micro-organism was identified by phenotypical tests, mass spectrometry (MALDI-TOF), DNA amplification (PCR) and sequencing of the 16S rRNA gene...
August 2016: JMM Case Reports
https://www.readbyqxmd.com/read/28347683/adult-food-borne-botulism-in-australia-the-only-2-cases-from-the-last-15years
#7
Prashanth Ramachandran, Eddie Chan, Michael Poon, Hans T H Tu, Jennifer M Davis, Damon Eisen, Mark Marriott
No abstract text is available yet for this article.
March 24, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28323873/a-three-monoclonal-antibody-combination-potently-neutralizes-multiple-botulinum-neurotoxin-serotype-f-subtypes
#8
Yongfeng Fan, Consuelo Garcia-Rodriguez, Jianlong Lou, Weihua Wen, Fraser Conrad, Wenwu Zhai, Theresa J Smith, Leonard A Smith, James D Marks
Human botulism is primarily caused by botulinum neurotoxin (BoNT) serotypes A, B and E, with around 1% caused by serotype F (BoNT/F). BoNT/F comprises at least seven different subtypes with the amino acid sequence difference between subtypes as high as 36%. The sequence differences present a significant challenge for generating monoclonal antibodies (mAbs) that can bind, detect and neutralize all BoNT/F subtypes. We used repertoire cloning of immune mouse antibody variable (V) regions and yeast display to generate a panel of 33 lead single chain Fv (scFv) mAbs that bound one or more BoNT/F subtypes with a median equilibrium dissociation constant (KD) of 4...
2017: PloS One
https://www.readbyqxmd.com/read/28306178/effective-treatment-of-infant-botulism-on-day-13-after-symptom-onset-with-human-botulism-antitoxin
#9
Anita J Campbell, Geoff Knight, Peter Walsh, Asha C Bowen
No abstract text is available yet for this article.
April 2017: Journal of Paediatrics and Child Health
https://www.readbyqxmd.com/read/28296078/botulinum-neurotoxin-type-b-uses-a-distinct-entry-pathway-mediated-by-cdc42-into-intestinal-cells-versus-neuronal-cells
#10
Chloé Connan, Marie Voillequin, Carolina Varela Chavez, Christelle Mazuet, Christian Leveque, Sandrine Vitry, Alain Vandewalle, Michel R Popoff
Botulinum neurotoxins (BoNTs) are responsible for severe flaccid paralysis by inhibiting the release of acetylcholine at the neuromuscular junctions. BoNT/B most often induces mild forms of botulism with predominant dysautonomic symptoms. In food borne botulism and botulism by intestinal colonization such as infant botulism, which are the most frequent naturally acquired forms of botulism, the digestive tract is the main entry route of BoNTs into the organism. We previously showed that BoNT/B translocates through mouse intestinal barrier by an endocytosis-dependent mechanism and subsequently targets neuronal cells, mainly cholinergic neurons, in the intestinal mucosa and musculosa...
March 11, 2017: Cellular Microbiology
https://www.readbyqxmd.com/read/28282873/crystal-structure-of-the-receptor-binding-domain-of-botulinum-neurotoxin-type-ha-also-known-as-type-fa-or-h
#11
Guorui Yao, Kwok-Ho Lam, Kay Perry, Jasmin Weisemann, Andreas Rummel, Rongsheng Jin
Botulinum neurotoxins (BoNTs), which have been exploited as cosmetics and muscle-disorder treatment medicines for decades, are well known for their extreme neurotoxicity to humans. They pose a potential bioterrorism threat because they cause botulism, a flaccid muscular paralysis-associated disease that requires immediate antitoxin treatment and intensive care over a long period of time. In addition to the existing seven established BoNT serotypes (BoNT/A-G), a new mosaic toxin type termed BoNT/HA (aka type FA or H) was reported recently...
March 8, 2017: Toxins
https://www.readbyqxmd.com/read/28280466/embryonic-stem-cell-derived-neurons-grown-on-multi-electrode-arrays-as-a-novel-in-vitro-bioassay-for-the-detection-of-clostridium-botulinum-neurotoxins
#12
Stephen P Jenkinson, Denis Grandgirard, Martina Heidemann, Anne Tscherter, Marc-André Avondet, Stephen L Leib
Clostridium botulinum neurotoxins (BoNTs) are the most poisonous naturally occurring protein toxins known to mankind and are the causative agents of the severe and potentially life-threatening disease botulism. They are also known for their application as cosmetics and as unique bio-pharmaceuticals to treat an increasing number of neurological and non-neurological disorders. Currently, the potency of biologically active BoNT for therapeutic use is mainly monitored by the murine LD50-assay, an ethically disputable test causing suffering and death of a considerable number of mice...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28273554/head-drop-after-botox-electrodiagnostic-evaluation-of-iatrogenic-botulinum-toxicity
#13
Eliza Szuch, James B Caress, Bandhu Paudyal, Allison Brashear, Michael S Cartwright, Roy E Strowd
BACKGROUND: Botulinum is a potent neurotoxin with increasing indications for neurologic disorders. While clinical benefit manifests primarily due to local actions at the neuromuscular junction, regional and systemic effects do occur. Rarely, systemic symptoms including weakness, dysarthria, dysphagia and other side effects occur as a result of iatrogenic botulinum neurotoxicity. CASE: A 72 year-old female with right leg dystonia developed head drop, bulbar and systemic weakness following right lower extremity botulinum toxin injection...
March 5, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/28271909/challenges-in-searching-for-therapeutics-against-botulinum-neurotoxins
#14
Marco Pirazzini, Ornella Rossetto
Botulinum neurotoxins (BoNTs) are the most potent toxins known. BoNTs are responsible for botulism, a deadly neuroparalytic syndrome caused by the inactivation of neurotransmitter release at peripheral nerve terminals. Thanks to their specificity and potency, BoNTs are both considered potential bio-weapons and therapeutics of choice for a variety of medical syndromes. Several variants of BoNTs have been identified with individual biological properties and little antigenic relation. This expands greatly the potential of BoNTs as therapeutics but poses a major safety problem, increasing the need for finding appropriate antidotes...
March 17, 2017: Expert Opinion on Drug Discovery
https://www.readbyqxmd.com/read/28264432/electrophysiological-characterization-of-the-antarease-metalloprotease-from-tityus-serrulatus-venom
#15
Irene Zornetta, Michele Scorzeto, Pablo Victor Mendes Dos Reis, Maria E De Lima, Cesare Montecucco, Aram Megighian, Ornella Rossetto
Scorpions are among the oldest venomous living organisms and the family Buthidae is the largest and most medically relevant one. Scorpion venoms include many toxic peptides, but recently, a metalloprotease from Tityus serrulatus called antarease was reported to be capable of cleaving VAMP2, a protein involved in the neuroparalytic syndromes of tetanus and botulism. We have produced antarease and an inactive metalloprotease mutant in a recombinant form and analyzed their enzymatic activity on recombinant VAMP2 in vitro and on mammalian and insect neuromuscular junction...
February 27, 2017: Toxins
https://www.readbyqxmd.com/read/28260503/in-vivo-neutralization-of-botulinum-neurotoxin-serotype-e-using-rabbit-polyclonal-antibody-developed-against-bont-e-light-chain
#16
Sarita Sarita, Ponmariappan Sarkaraisamy, Arti Sharma, D V Kamboj, A K Jain
Clostridium botulinum is an obligate anaerobic, Gram positive bacterium that secretes extremely toxic substances known as botulinum neurotoxins (BoNTs) that cause serious paralytic illness called botulism. Based upon the serological properties, these neurotoxin have been classified into seven serotypes designated from A to G. Due to extreme toxicity of BoNTs, these neurotoxins have been designated as category A biowarfare agents. There is no commercial neutralizing antibody available for the treatment of botulism...
March 1, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28252640/crystal-structure-of-the-bont-a2-receptor-binding-domain-in-complex-with-the-luminal-domain-of-its-neuronal-receptor-sv2c
#17
Roger M Benoit, Martin A Schärer, Mara M Wieser, Xiaodan Li, Daniel Frey, Richard A Kammerer
A detailed molecular understanding of botulinum neurotoxin (BoNT)/host-cell-receptor interactions is fundamental both for developing strategies against botulism and for generating improved BoNT variants for medical applications. The X-ray crystal structure of the receptor-binding domain (HC) of BoNT/A1 in complex with the luminal domain (LD) of its neuronal receptor SV2C revealed only few specific side-chain - side-chain interactions that are important for binding. Notably, two BoNT/A1 residues, Arg 1156 and Arg 1294, that are crucial for the interaction with SV2, are not conserved among subtypes...
March 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28174033/acute-hypotonia-in-an-infant
#18
Jimme Sierakowski, Jason Arthur, Todd Wylie
BACKGROUND: Acute flaccid myelitis (AFM) is increasing in incidence in the United States and presenting to emergency departments (EDs) across the country. This clinical entity presents as acute paralysis, with magnetic resonance imaging changes in the gray matter only in children younger than 21 years of age. The etiology is unknown, although preceding viral illnesses are common. There are no consensus guidelines regarding treatment. CASE REPORT: A 4-month-old girl presented with decreased bilateral arm movement...
February 4, 2017: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28166935/toxicoses-of-the-ruminant-nervous-system
#19
REVIEW
Gene A Niles
This article discusses the etiology, mechanism of action, clinical signs, and diagnostic tests used to identify toxic agents that affect the nervous system of ruminants. The article is not intended to be an exhaustive review of each agent, but a reference for establishing a differential diagnosis when toxic agents are suspected as the cause of central nervous system disease in ruminants. The initial focus of the article is on agents that cause brain lesions consistent with polioencephalomalacia. Other neurotoxic disease agents include bovine bonkers, urea, organophosphate, organochlorine, cyanobacteria, zinc, aluminum, phosphide, metaldehyde, strychnine, botulism, tetanus, clostridium perfringens, and poisonous plants...
March 2017: Veterinary Clinics of North America. Food Animal Practice
https://www.readbyqxmd.com/read/28076405/development-and-validation-of-a-new-reliable-method-for-the-diagnosis-of-avian-botulism
#20
Caroline Le Maréchal, Sandra Rouxel, Valentine Ballan, Emmanuelle Houard, Typhaine Poezevara, Marie-Hélène Bayon-Auboyer, Rozenn Souillard, Hervé Morvan, Marie-Agnès Baudouard, Cédric Woudstra, Christelle Mazuet, Sophie Le Bouquin, Patrick Fach, Michel Popoff, Marianne Chemaly
Liver is a reliable matrix for laboratory confirmation of avian botulism using real-time PCR. Here, we developed, optimized, and validated the analytical steps preceding PCR to maximize the detection of Clostridium botulinum group III in avian liver. These pre-PCR steps included enrichment incubation of the whole liver (maximum 25 g) at 37°C for at least 24 h in an anaerobic chamber and DNA extraction using an enzymatic digestion step followed by a DNA purification step. Conditions of sample storage before analysis appear to have a strong effect on the detection of group III C...
2017: PloS One
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