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https://www.readbyqxmd.com/read/27907208/interaction-between-salmonella-and-schistosomiasis-a-review
#1
REVIEW
Amber Hsiao, Trevor Toy, Hye Jin Seo, Florian Marks
The interaction between schistosomiasis and Salmonella is a particularly important issue in Africa, where dual infection by the parasite and the bacterium are likely common. In this review, the ways in which schistosomiasis affects human biology as it relates to Salmonella are described. Those who are infected by both organisms experience reduced immunological functioning, exhibit irreversible organ damage due to prolonged schistosomiasis infection, and become latent carriers of Salmonella enterica serotypes Typhi and Paratyphi and S...
December 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27906139/myxobacteria-mediated-synthesis-of-silver-nanoparticles-and-their-impregnation-in-wrapping-paper-used-for-enhancing-shelf-life-of-apples
#2
Swati Bhople, Swapnil Gaikwad, Swapna Deshmukh, Shital Bonde, Aniket Gade, Sanjib Sen, Anna Brezinska, Hanna Dahm, Mahendra Rai
The authors report Myxobacteria virescens (M. virescens) mediated synthesis of silver nanoparticles (AgNPs) and its efficacy against Staphylococcus aureus (ATCC-33591), Salmonella typhi (ATCC-51812), Escherichia coli (E. coli) (ATCC-14948), Klebsiella pneumoniae (MTCC-4030) and Pseudomonas aeruginosa (MTCC-4673). The organism exhibiting resistance to various antibiotics showed remarkable sensitivity, when used in combination of antibiotics and AgNPs. Antimicrobial property of AgNPs is playing a significant role in medicine and food storage...
December 2016: IET Nanobiotechnology
https://www.readbyqxmd.com/read/27902389/antimicrobial-susceptibility-to-azithromycin-among-salmonella-enterica-typhi-and-paratyphi-a-isolates-from-india
#3
Richa Misra, Kashi N Prasad
Decreased ciprofloxacin susceptibility (DCS) and multi-drug resistance (MDR) in typhoidal Salmonella isolates in areas of endemicity is a significant therapeutic problem. Guidelines for azithromycin disk diffusion and minimal inhibitory concentration (MIC) interpretive criteria for Salmonella enterica serovar Typhi were published recently by CLSI in 2015.We investigated the antimicrobial susceptibility pattern of azithromycin in 100 isolates of Salmonella Typhi (n=80), Paratyphi A (n=18) and B (n=2) recovered from blood stream infections from January 2013 to December 2015...
November 10, 2016: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/27894983/a-case-of-clinical-and-microbiological-failure-of-azithromycin-therapy-in-salmonella-enterica-serotype-typhi-despite-low-azithromycin-mic
#4
Abi Manesh, Veeraraghavan Balaji, Devanga Ragupathi Naveen Kumar, Priscilla Rupali
Typhoid fever remains a serious problem in many developing countries. Due to resistance to multiple first line drugs, azithromycin has evolved as an important drug in the treatment of Typhoid. While therapy with azithromycin is highly effective, no clinically validated mean inhibitory concentration (MIC) break points or disc diffusion cutoff guidelines are available so far. We describe an Indian adult with clinical and microbiological failure to azithromycin despite low azithromycin MIC.
November 25, 2016: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/27894775/synthesis-characterization-and-biological-studies-of-schiff-bases-derived-from-heterocyclic-moiety
#5
Angamaly Antony Shanty, Jessica Elizabeth Philip, Eeettinilkunnathil Jose Sneha, Maliyeckal R Prathapachandra Kurup, Sreedharannair Balachandran, Puzhavoorparambil Velayudhan Mohanan
Some new Schiff bases (H1-H7) have been synthesized by the condensation of 2-aminophenol, 2-amino-4-nitrophenol, 2-amino-4-methylphenol, 2-amino benzimidazole with thiophene-2-carboxaldehyde and pyrrole-2-carboxaldehyde. The structures of newly synthesized compounds were characterized by elemental analysis, FT-IR, (1)H NMR, UV-VIS, and single crystal X-ray crystallography. The in vitro antibacterial activity of the synthesized compounds has been tested against Salmonella typhi, Bacillus coagulans, Bacillus pumills, Escherichia coli, Bacillus circulans, Pseudomonas, Clostridium and Klebsilla pneumonia by disk diffusion method...
November 21, 2016: Bioorganic Chemistry
https://www.readbyqxmd.com/read/27890811/enteric-fever-in-barcelona-changing-patterns-of-importation-and-antibiotic-resistance
#6
Ana Requena-Méndez, Monica Berrocal, Manuel Almela, Alex Soriano, Joaquim Gascón, José Muñoz
BACKGROUND: Enteric fever's incidence is decreasing among residents of high-income countries, although it's rising in travelers coming from low-resource endemic settings. The study's aim is to describe epidemiological, clinical and laboratory features of patients with enteric fever. METHODS: Retrospective descriptive study of enteric fever cases diagnosed at a Tropical Medicine Unit in Barcelona, 1993-2012. RESULTS: Out of 40 patients, 31(77,5%) were returning travelers, and 70% of them had been in Southern Asia...
November 24, 2016: Travel Medicine and Infectious Disease
https://www.readbyqxmd.com/read/27881119/antibacterial-and-antifungal-potentials-of-the-solvents-extracts-from-eryngium-caeruleum-notholirion-thomsonianum-and-allium-consanguineum
#7
Abdul Sadiq, Sadiq Ahmad, Rahmat Ali, Fawad Ahmad, Sajjad Ahmad, Anwar Zeb, Muhammad Ayaz, Farhat Ullah, Abu Nasar Siddique
BACKGROUND: Herbal medicines have long been used for various ailments in various societies and natural bioactive compounds are gaining more and more importance due to various factors. In this context, three plant species i.e., Eryngium caeruleum, Notholirion thomsonianum and Allium consanguineum have been aimed for the scientific verification of their purported traditional uses against various infectious diseases. METHODS: In this study, three plants were assayed for antibacterial and antifungal potentials...
November 24, 2016: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/27875529/cd4-t-cells-are-as-protective-as-cd8-t-cells-against-rickettsia-typhi-infection-by-activating-macrophage-bactericidal-activity
#8
Kristin Moderzynski, Stefanie Papp, Jessica Rauch, Liza Heine, Svenja Kuehl, Ulricke Richardt, Bernhard Fleischer, Anke Osterloh
Rickettsia typhi is an intracellular bacterium that causes endemic typhus, a febrile disease that can be fatal due to complications including pneumonia, hepatitis and meningoencephalitis, the latter being a regular outcome in T and B cell-deficient C57BL/6 RAG1-/- mice upon Rickettsia typhi infection. Here, we show that CD4+ TH1 cells that are generated in C57BL/6 mice upon R. typhi infection are as protective as cytotoxic CD8+ T cells. CD4+- as well as CD8+-deficient C57BL/6 survived the infection without showing symptoms of disease at any point in time...
November 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27869515/vi-capsular-polysaccharide-synthesis-virulence-and-application
#9
Xiaomei Hu, Zhijin Chen, Kun Xiong, Jing Wang, Xiancai Rao, Yanguang Cong
Vi capsular polysaccharide, a linear homopolymer of α-1,4-linked N-acetylgalactosaminuronate, is characteristically produced by Salmonella enterica serovar Typhi. The Vi capsule covers the surface of the producing bacteria and serves as an virulence factor via inhibition of complement-mediated killing and promoting resistance against phagocytosis. Furthermore, Vi also represents a predominant protective antigen and plays a key role in the development of vaccines against typhoid fever. Herein, we reviewed the latest advances associated with the Vi polysaccharide, from its synthesis and transport within bacterial cells, mechanisms involved in virulence, immunological characteristics, and applications in vaccine, as well as its purification and detection methods...
November 21, 2016: Critical Reviews in Microbiology
https://www.readbyqxmd.com/read/27865953/polysaccharide-of-caper-capparis-spinosa-l-leaf-extraction-optimization-antioxidant-potential-and-antimicrobial-activity
#10
Farzad Mazarei, Hossein Jooyandeh, Mohammad Noshad, Mohammad Hojjati
Three-variable-three-level Box-Behnken design-response surface methodology (BBD-RSM) based on the single-factor experiments was used to optimize the extracting parameters of crude polysaccharides (CPSs) from the Capparis spinosa leaves (CSL) including extraction time (ETi, 60-120min), extraction temperature (ETe, 60-80°C), and the water/solid ratio (W/S, 6-16). The optimal process conditions in order to the highest yield (6.73%) of CSL-CPSs were 119.8min ETi, 72.84°C ETe, and 15.97:1W/S.Structure of polysaccharide extracted at the optimal operating point were identified by Fourier transform-infrared spectroscopy (FT-IR)...
November 16, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27835979/pharmacologically-active-flavonoids-from-the-anticancer-antioxidant-and-antimicrobial-extracts-of-cassia-angustifolia-vahl
#11
Shabina Ishtiaq Ahmed, Muhammad Qasim Hayat, Muhammad Tahir, Qaisar Mansoor, Muhammad Ismail, Kristen Keck, Robert B Bates
BACKGROUND: Cassia angustifolia Vahl. (commonly known as senna makkai or cassia senna), native to Saudi Arabia, Egypt, Yemen and also extensively cultivated in Pakistan, is a medicinal herb used traditionally to cure number of diseases like liver diseases, constipation, typhoid, cholera etc. This study was conducted to evaluate the in-vitro antimicrobial, antioxidant and anticancer assays and phytochemical constituents of aqueous and organic extracts of C. angustifolia leaves. METHODS: The antimicrobial activities of C...
November 11, 2016: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/27832592/receptor-mediated-sorting-of-typhoid-toxin-during-its-export-from-salmonella-typhi-infected-cells
#12
Shu-Jung Chang, Jeongmin Song, Jorge E Galán
Typhoid toxin is an essential virulence factor of Salmonella Typhi, the cause of typhoid fever. Typhoid toxin is secreted into the lumen of Salmonella-containing vacuole (SCV), after which it is packaged into vesicle carrier intermediates and released extracellularly through incompletely understood mechanisms. Following export, the toxin targets cells by interacting with human-specific Neu5Ac-terminated glycan receptors. We show that typhoid toxin is sorted from the SCV into vesicle carrier intermediates via interactions of its B subunit, PltB, with specific lumenal sialylated glycan packaging receptors...
November 9, 2016: Cell Host & Microbe
https://www.readbyqxmd.com/read/27817242/nanoparticle-fullerene-c60-demonstrated-stable-binding-with-antibacterial-potential-towards-probable-targets-of-drug-resistant-salmonella-typhi-a-computational-perspective-and-in-vitro-investigation
#13
Sinosh Skariyachan, Asma Parveen, Shruti Garka
Salmonella typhi, a Gram negative bacterium, has become multidrug resistant (MDR) to wide classes of antibacterials which necessitate an alarming precaution. This study focuses on the binding potential and therapeutic insight of Nano-Fullerene C60 towards virulent targets of Salmonella typhi by computational prediction and preliminary in vitro assays. The clinical isolates of Salmonella typhi were collected and antibiotic susceptibility profiles were assessed. The drug targets of pathogen were selected by rigorous literature survey and gene network analysis by various metabolic network resources...
November 6, 2016: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/27816916/limited-evidence-for-rickettsia-felis-as-a-cause-of-zoonotic-flea-borne-rickettsiosis-in-southern-california
#14
Sarah A Billeter, Marco E Metzger
Over 90% of human flea-borne rickettsioses cases in California are reported from suburban communities of Los Angeles and Orange counties and are presumed to be associated with either Rickettsia typhi or Rickettsia felis infection. Ctenocephalides felis (Bouché) is considered the principal vector for both rickettsiae, and R. felis has largely replaced R. typhi as the presumptive etiologic agent based on the widespread incidence of R. felis in cat flea populations. However, with no evidence to confirm R. felis as the cause of human illness in southern California, coupled with recent findings that showed R...
November 4, 2016: Journal of Medical Entomology
https://www.readbyqxmd.com/read/27809955/live-attenuated-human-salmonella-vaccine-candidates-tracking-the-pathogen-in-natural-infection-and-stimulation-of-host-immunity
#15
James E Galen, Amanda D Buskirk, Sharon M Tennant, Marcela F Pasetti
Salmonellosis, caused by members of the genus Salmonella, is responsible for considerable global morbidity and mortality in both animals and humans. In this review, we will discuss the pathogenesis of Salmonella enterica serovar Typhi and Salmonella enterica serovar Typhimurium, focusing on human Salmonella infections. We will trace the path of Salmonella through the body, including host entry sites, tissues and organs affected, and mechanisms involved in both pathogenesis and stimulation of host immunity. Careful consideration of the natural progression of disease provides an important context in which attenuated live oral vaccines can be rationally designed and developed...
November 2016: EcoSal Plus
https://www.readbyqxmd.com/read/27803169/development-of-a-live-attenuated-bivalent-oral-vaccine-against-shigella-sonnei-shigellosis-and-typhoid-fever
#16
Yun Wu, Sumana Chakravarty, Minglin Li, Tint T Wai, Stephen L Hoffman, B Kim Lee Sim
Shigella sonnei (Ss) and Salmonella Typhi cause significant morbidity and mortality. We exploited the safety record of the oral, attenuated S. Typhi vaccine (Ty21a) by utilizing it as a vector to develop a bivalent oral vaccine to protect against Ss shigellosis and typhoid fever. We recombineered the Ss form I O-antigen gene cluster into the Ty21a chromosome to create Ty21a-Ss, which stably expresses Ss form I O-antigen. To enhance survivability in the acid environment of the stomach, we created an acid resistant strain, Ty21a-AR-Ss, by inserting Shigella glutaminase-glutamate decarboxylase systems co-expressed with Ss form I O-antigen gene...
October 31, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27799640/flea-borne-rickettsioses-and-rickettsiae
#17
REVIEW
Lucas S Blanton, David H Walker
Rickettsia typhi and Rickettsia felis are flea-borne rickettsiae that are distributed throughout the world. This mini-review outlines the ecology and epidemiology of flea-borne rickettsioses; highlights important clinical, diagnostic, and therapeutic considerations; and discusses areas of uncertainty regarding Rickettsia felis and other rickettsiae harbored by fleas.
October 31, 2016: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/27797841/cotrimoxazole-treats-fluoroquinolone-resistant-salmonella-typhi-h58-infection
#18
Manan Karki, Sarbagya Pandit, Stephen Baker, Buddha Basnyat
A woman aged 20 years presented with fever and no localising signs. She was treated with cotrimoxazole and the subsequent blood culture was positive for Salmonella typhi (S. typhi), which was resistant to fluoroquinolones but susceptible to cotrimoxazole. Genotyping identified an FQ-R subclade of H58 S. typhi Fever clearance time was 4 days after starting the antibiotics, and no relapses were noted on 2 months of follow-up. This inexpensive, well-known and easily available antimicrobial could be suitably redeployed for fluoroquinolone-resistant enteric fever in South Asia...
October 26, 2016: BMJ Case Reports
https://www.readbyqxmd.com/read/27797598/the-unrecognized-burden-of-typhoid-fever
#19
Stephen K Obaro, Pui-Ying Iroh Tam, Eric Daniel Mintz
Typhoid fever (TF), caused by Salmonella enterica serovar Typhi, is the most common cause of enteric fever, responsible for an estimated 129,000 deaths and more than 11 million cases annually. Although several reviews have provided global and regional TF disease burden estimates, major gaps in our understanding of TF epidemiology remain. Areas covered: We provide an overview of the gaps in current estimates of TF disease burden and offer suggestions for addressing them, so that affected communities can receive the full potential of disease prevention offered by vaccination and water, sanitation, and hygiene interventions...
November 16, 2016: Expert Review of Vaccines
https://www.readbyqxmd.com/read/27780232/typhoid-fever-in-south-africa-in-an-endemic-hiv-setting
#20
Karen H Keddy, Arvinda Sooka, Anthony M Smith, Alfred Musekiwa, Nomsa P Tau, Keith P Klugman, Frederick J Angulo
BACKGROUND: Typhoid fever remains an important disease in Africa, associated with outbreaks and the emerging multidrug resistant Salmonella enterica serotype Typhi (Salmonella Typhi) haplotype, H58. This study describes the incidence of, and factors associated with mortality due to, typhoid fever in South Africa, where HIV prevalence is high. METHODS AND FINDINGS: Nationwide active laboratory-based surveillance for culture-confirmed typhoid fever was undertaken from 2003-2013...
2016: PloS One
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