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https://www.readbyqxmd.com/read/27920299/the-type-iii-secretion-system-effector-sptp-of-salmonella-enterica-serovar-typhi
#1
Rebecca Johnson, Alexander Byrne, Cedric N Berger, Elizabeth Klemm, Valerie F Crepin, Gordon Dougan, Gad Frankel
: Salmonella enterica serovars causes gastroenteritis or typhoid fever in humans, with virulence depending on the action of two type III secretion systems (SPI-1 and SPI-2). SptP is a Salmonella SPI-1 effector, involved in mediating recovery of the host cytoskeleton post-infection. SptP requires a chaperone, SicP, for stability and secretion. SptP has 94% identity between S Typhimurium and S Typhi; direct comparison of the protein sequences revealed that S Typhi SptP has numerous amino acid changes within its chaperone-binding domain...
December 5, 2016: Journal of Bacteriology
https://www.readbyqxmd.com/read/27919235/geographical-distribution-of-typhoid-risk-factors-in-low-and-middle-income-countries
#2
Jung-Seok Lee, Vijayalaxmi V Mogasale, Vittal Mogasale, Kangsung Lee
BACKGROUND: While the global burden of typhoid fever has been often brought up for attention, the detailed surveillance information has only been available for the limited number of countries. As more efficacious vaccines will be available in the near future, it is essential to understand the geographically diverse patterns of typhoid risk levels and to prioritize the right populations for vaccination to effectively control the disease. METHODS: A composite index called the typhoid risk factor (TRF) index was created based on data with the Global Positioning System (GPS)...
December 5, 2016: BMC Infectious Diseases
https://www.readbyqxmd.com/read/27916384/antimicrobial-resistance-and-molecular-subtypes-of-salmonella-enterica-serovar-typhi-isolates-from-kolkata-india-over-a-15-years-period-1998-2012
#3
Surojit Das, Sriparna Samajpati, Ujjwayini Ray, Indranil Roy, Shanta Dutta
Typhoid fever, caused by Salmonella enterica serovar Typhi (S. Typhi), remains an unresolved public health problem in India. Emergence of antimicrobial resistant strains poses a great concern for typhoid treatment and influences reshaping of current S. Typhi population. We included representative S. Typhi strains (n=164) from retrospective studies, both community and hospital based, conducted at National Institute of Cholera and Enteric Diseases, Kolkata during 15 years period (1998-2012) to analyze their antimicrobial resistance (AMR) profiles, mechanism of AMR and molecular subtypes of the strains...
November 25, 2016: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/27906062/severe-thrombocytopenia-in-a-child-with-typhoid-fever-a-case-report
#4
Mohammed Al Reesi, Glenn Stephens, Brendan McMullan
BACKGROUND: Although thrombocytopenia is common in typhoid fever, its course, response to treatment, and need for specific therapies such as platelet transfusion are not well characterized. CASE PRESENTATION: We report a case of typhoid fever in a 4-year-old Asian male returned traveler, admitted with prolonged fever and found to have severe thrombocytopenia (platelets 16 × 10(9)/L). Despite appropriate antibiotic therapy, his platelet recovery was slow, but did not lead to complications and he did not require platelet transfusion...
November 30, 2016: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/27905890/low-and-declining-attack-rates-of-imported-typhoid-fever-in-the-netherlands-1997-2014-in-spite-of-a-restricted-vaccination-policy
#5
F S T Suryapranata, M Prins, G J B Sonder
BACKGROUND: Typhoid fever mainly occurs in (sub) tropical regions where sanitary conditions remain poor. In other regions it occurs mainly among returning travelers or their direct contacts. The aim of this study was to evaluate the current Dutch guidelines for typhoid vaccination. METHOD: Crude annual attack rates (AR) per 100,000 Dutch travelers were calculated during the period 1997 to 2014 by dividing the number of typhoid fever cases by the estimated total number of travelers to a specific country or region...
December 1, 2016: BMC Infectious Diseases
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
#6
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/27891335/a-comparative-evaluation-of-different-diagnostic-modalities-in-the-diagnosis-of-typhoid-fever-using-a-composite-reference-standard-a-tertiary-hospital-based-study-in-central-india
#7
Veena Maheshwari, Navinchandra Motiram Kaore, Vijay Kumar Ramnani, Sheil Sarda
INTRODUCTION: Enteric fever, caused by Salmonella spp. is a major cause of morbidity and mortality worldwide and endemic in many developing countries including India and other South-East Asian countries. Blood culture is regarded as the gold standard for diagnosis. Currently, the standard serological method is tube agglutination with moderate sensitivity and specificity. Dot blot assay detecting IgM and IgG antibodies to a specific 50kD Outer Membrane Protein (OMP) antigen of Salmonella spp...
October 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27869515/vi-capsular-polysaccharide-synthesis-virulence-and-application
#8
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/27832592/receptor-mediated-sorting-of-typhoid-toxin-during-its-export-from-salmonella-typhi-infected-cells
#9
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/27825318/prevalence-of-malaria-typhoid-toxoplasmosis-and-rubella-among-febrile-children-in-cameroon
#10
Olivia A Achonduh-Atijegbe, Kenji O Mfuh, Aristid H E Mbange, Jean P Chedjou, Diane W Taylor, Vivek R Nerurkar, Wilfred F Mbacham, Rose Leke
BACKGROUND: The current roll-out of rapid diagnostic tests (RDTs) in many endemic countries has resulted in the reporting of fewer cases of malaria-attributed illnesses. However, lack of knowledge of the prevalence of other febrile illnesses and affordable diagnostic tests means that febrile patients are not managed optimally. This study assessed the prevalence of commonly treatable or preventable febrile illnesses in children between 6 months and 15 years using rapid diagnostic tests at the point-of-care...
November 8, 2016: BMC Infectious Diseases
https://www.readbyqxmd.com/read/27812090/diagnosis-of-persistent-fever-in-the-tropics-set-of-standard-operating-procedures-used-in-the-nidiag-febrile-syndrome-study
#11
Emilie Alirol, Ninon Seiko Horie, Barbara Barbé, Veerle Lejon, Kristien Verdonck, Philippe Gillet, Jan Jacobs, Philippe Büscher, Basudha Kanal, Narayan Raj Bhattarai, Sayda El Safi, Thong Phe, Kruy Lim, Long Leng, Pascal Lutumba, Deby Mukendi, Emmanuel Bottieau, Marleen Boelaert, Suman Rijal, François Chappuis
In resource-limited settings, the scarcity of skilled personnel and adequate laboratory facilities makes the differential diagnosis of fevers complex [1-5]. Febrile illnesses are diagnosed clinically in most rural centers, and both Rapid Diagnostic Tests (RDTs) and clinical algorithms can be valuable aids to health workers and facilitate therapeutic decisions [6,7]. The persistent fever syndrome targeted by NIDIAG is defined as presence of fever for at least one week. The NIDIAG clinical research consortium focused on potentially severe and treatable infections and therefore targeted the following conditions as differential diagnosis of persistent fever: visceral leishmaniasis (VL), human African trypanosomiasis (HAT), enteric (typhoid and paratyphoid) fever, brucellosis, melioidosis, leptospirosis, malaria, tuberculosis, amoebic liver abscess, relapsing fever, HIV/AIDS, rickettsiosis, and other infectious diseases (e...
November 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27803169/development-of-a-live-attenuated-bivalent-oral-vaccine-against-shigella-sonnei-shigellosis-and-typhoid-fever
#12
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/27801802/water-related-impacts-of-climate-change-on-agriculture-and-subsequently-on-public-health-a-review-for-generalists-with-particular-reference-to-pakistan
#13
REVIEW
Toqeer Ahmed, Miklas Scholz, Furat Al-Faraj, Wajeeha Niaz
Water-related impacts due to change in climatic conditions ranging from water scarcity to intense floods and storms are increasing in developing countries like Pakistan. Water quality and waterborne diseases like hepatitis, cholera, typhoid, malaria and dengue fever are increasing due to chaotic urbanization, industrialization, poor hygienic conditions, and inappropriate water management. The morbidity rate is high due to lack of health care facilities, especially in developing countries. Organizations linked to the Government of Pakistan (e...
October 27, 2016: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/27797598/the-unrecognized-burden-of-typhoid-fever
#14
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/27796818/enteric-fever
#15
REVIEW
Praveen Kumar, Ruchika Kumar
Enteric fever is an important public-health problem in India. The clinical presentation of typhoid fever is very variable, ranging from fever with little other morbidities to marked toxemia and associated multisystem complications. Fever is present in majority of patients (>90 %) irrespective of their age group. Mortality is higher in younger children. Blood culture remains gold standard for diagnosis. Widal test has low sensitivity and specificity but may be used in second week to support the diagnosis...
October 29, 2016: Indian Journal of Pediatrics
https://www.readbyqxmd.com/read/27794508/antimicrobial-cytotoxic-and-anti-inflammatory-activities-of-pleopeltis-polylepis
#16
Angel V Contreras Cárdenas, Luis R Hernández, Zaida N Juárez, Eugenio Sánchez-Arreola, Horacio Bach
AIM OF THE STUDY: Pleopeltis polylepis (Polypodaceae) is a fern used in the traditional Mexican medicine to treat fever, bleeding, typhoid, cough, pertussis, chest pain, and renal and hepatic diseases. The aim of this study was to analyze the bioactivities of different extracts, fractions and isolated compounds from this species to scientifically validate its medicinal applications. MATERIALS AND METHODS: Aerial parts of P. polylepis were macerated and extracted consecutively with hexane, chloroform, and methanol...
October 26, 2016: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/27780232/typhoid-fever-in-south-africa-in-an-endemic-hiv-setting
#17
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
https://www.readbyqxmd.com/read/27771690/immune-thrombocytopenic-purpura-in-typhoid-fever
#18
Aniruddha Ghosh, Arunaloke Bhattacharya
No abstract text is available yet for this article.
October 8, 2016: Indian Pediatrics
https://www.readbyqxmd.com/read/27756305/bcsz-inhibits-biofilm-phenotypes-and-promotes-virulence-by-blocking-cellulose-production-in-salmonella-enterica-serovar-typhimurium
#19
Irfan Ahmad, Syed Fazle Rouf, Lei Sun, Annika Cimdins, Sulman Shafeeq, Soazig Le Guyon, Marco Schottkowski, Mikael Rhen, Ute Römling
BACKGROUND: Cellulose, a 1,4 beta-glucan polysaccharide, is produced by a variety of organisms including bacteria. Although the production of cellulose has a high biological, ecological and economical impact, regulatory mechanisms of cellulose biosynthesis are mostly unknown. Family eight cellulases are regularly associated with cellulose biosynthesis operons in bacteria; however, their function is poorly characterized. In this study, we analysed the role of the cellulase BcsZ encoded by the bcsABZC cellulose biosynthesis operon of Salmonella enterica serovar Typhimurium (S...
October 19, 2016: Microbial Cell Factories
https://www.readbyqxmd.com/read/27746454/pharyngeal-typhoid-a-rare-complication-of-typhoid-fever
#20
Koh Shinohara, Kei Yamamoto, Yasuyuki Kato, Norio Ohmagari
No abstract text is available yet for this article.
2016: Internal Medicine
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