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https://www.readbyqxmd.com/read/28640809/development-of-elisas-for-diagnosis-of-acute-typhoid-fever-in-nigerian-children
#1
Jiin Felgner, Aarti Jain, Rie Nakajima, Li Liang, Algis Jasinskas, Eduardo Gotuzzo, Joseph M Vinetz, Fabio Miyajima, Munir Pirmohamed, Fatimah Hassan-Hanga, Dominic Umoru, Binta Wudil Jibir, Safiya Gambo, Kudirat Olateju, Philip L Felgner, Stephen Obaro, D Huw Davies
Improved serodiagnostic tests for typhoid fever (TF) are needed for surveillance, to facilitate patient management, curb antibiotic resistance, and inform public health programs. To address this need, IgA, IgM and IgG ELISAs using Salmonella enterica serovar Typhi (S. Typhi) lipopolysaccharide (LPS) and hemolysin E (t1477) protein were conducted on 86 Nigerian pediatric TF and 29 non-typhoidal Salmonella (NTS) cases, 178 culture-negative febrile cases, 28 "other" (i.e., non-Salmonella) pediatric infections, and 48 healthy Nigerian children...
June 22, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28637001/a-novel-method-to-generate-salmonella-typhi-ty21a-ghosts-exploiting-the-%C3%AE-phage-holin-endolysin-system
#2
Gayeon Won, Boram Kim, John Hwa Lee
Human typhoid fever caused by Salmonella Typhi still poses a severe global disease burden in developing countries despite the availability of commercial vaccines. In this study, we constructed a non-living S. Typhi Ty21a vaccine candidate by employing a lambda (λ) phage-derived holin-endolysin system to efficiently construct bacterial ghosts. The lysis plasmid pJHL464 harbors an R lysis cassette that is stringently regulated by dual promoters containing cI857/λPR and ParaBAD/araC components. The plasmid was introduced into an asd gene-deleted S...
June 6, 2017: Oncotarget
https://www.readbyqxmd.com/read/28630688/prevalence-of-antimicrobial-resistant-pathogens-from-blood-cultures-results-from-a-laboratory-based-nationwide-surveillance-in-ghana
#3
Japheth Awuletey Opintan, Mercy Jemima Newman
BACKGROUND: Blood stream infections (BSI) are critical medical conditions with high morbidity and mortality. There is paucity of information on BSI from surveillance studies in Ghana. AIM: This study sought to demonstrate how useful BSI data can be gleaned from population-based surveillance, especially from resource-limited settings. METHODS: Data from a nationwide surveillance of antimicrobial drug resistance (AMR) in Ghana were extracted and analyzed...
2017: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/28630073/new-insights-into-the-roles-of-lpf-and-stg-fimbriae-in-salmonella-interactions-with-enterocytes-and-m-cells
#4
Amanda M Gonzales, Shyra Wilde, Kenneth L Roland
Salmonella enterica serovar Typhi causes the systemic disease typhoid fever. After ingestion, it adheres to and invades the host epithelium while evading the host innate immune response, causing little if any inflammation. Conversely, S Typhimurium causes gastroenteritis in humans and thrives in the inflamed gut. Upon entering the host, S Typhimurium preferentially colonizes Peyer's patches, a lymphoid organ in which microfold cells (M cells) overlay an arrangement of B cells, T cells, and antigen presenting cells...
June 19, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28622429/synthesis-and-antigenic-evaluation-of-oligosaccharide-mimics-of-vi-antigen-from-salmonella-typhi
#5
Xinshan Ye, Gao-Lan Zhang, Lin Yang, Jingjing Zhu
Salmonella typhi is responsible for typhoid fever, which is a serious health threat in developing countries. As a virulent factor of Salmonella typhi, the purified Vi polysaccharide (Vi PS) has become an effective vaccine to combat typhoid fever. The chemical synthesis can provide homogeneous and well-defined molecules for the development of Vi-based vaccines. However, the synthesis of Vi oligosaccharides in high yields and with exclusive α-stereoselectivities remains very challenging. In this paper, a series of Vi pseudooligosaccharides, including pseudo tetra-, hexa-, and octa-saccharides were efficiently synthesized...
June 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28619415/international-travelers-sociodemographic-health-and-travel-characteristics-an-italian-study
#6
Gianmarco Troiano, Astrid Mercone, Alessandra Bagnoli, Nicola Nante
BACKGROUND: Approximately the 8% of travelers requires medical care, with the diagnosis of a vaccine-preventable disease. The aim of our study was to analyze the socio-demographic, health and travel characteristics of the Italian international travelers. METHODS: We conducted a cross sectional study from January 2015 to June 2016, at the Travel Medicine Clinic of Siena, asking the doctor to interview patients who attended the Clinic, recording socio-demographic and travel information, malaria prophylaxis, vaccinations...
March 2017: Annals of Global Health
https://www.readbyqxmd.com/read/28618230/anti-mosquito-activity-of-a-titanium-organic-framework-supported-on-fabrics
#7
Reda M Abdelhameed, Omnia M H M Kamel, A Amr, Joao Rocha, Artur M S Silva
Waste swamps, stagnant water and poor hygiene practices result in the proliferation of mosquitoes that may cause transmissible and infectious diseases, such as malaria, typhoid, cholera, and Zikavirus sickness. Composites of the traditional natural fibres cotton, viscose and linen, and a Ti-bearing metal-organic framework, NH2-MIL-125, is very effective against mosquitoes, in the absence of any conventional insecticides. Prior to coating with NH2-MIL-125 crystals, the fabrics have been modified with 3-glycidyloxypropyltrimethoxysilane...
June 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28617661/molecular-dynamics-approach-to-probe-the-antigenicity-of-pagn-an-outer-membrane-protein-of-salmonella-typhi
#8
Nabajyoti Goswami, Md Iftikar Hussain, Probodh Borah
PagN is a highly immunogenic 27-kDa outer membrane adhesin present in Salmonella Typhi. It plays a major role in the pathogenesis of typhoid fever and has emerged as a strong vaccine candidate. In this report, we predict the three dimensional structure of PagN and describe the conformational dynamics associated with its 4 extracellular loops based on two 100-ns molecular dynamics simulations at 300 K and 310 K. The formation and deformation of the secondary structures on these loops were also investigated during the simulations which revealed loops L1 and L2 to be highly flexible, whereas the relative flexibility of loops L3 and L4 was minimal...
June 15, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/28615285/vaccination-against-salmonella-infection-the-mucosal-way
#9
REVIEW
Rémi Gayet, Gilles Bioley, Nicolas Rochereau, Stéphane Paul, Blaise Corthésy
Salmonella enterica subspecies enterica includes several serovars infecting both humans and other animals and leading to typhoid fever or gastroenteritis. The high prevalence of associated morbidity and mortality, together with an increased emergence of multidrug-resistant strains, is a current global health issue that has prompted the development of vaccination strategies that confer protection against most serovars. Currently available systemic vaccine approaches have major limitations, including a reduced effectiveness in young children and a lack of cross-protection among different strains...
September 2017: Microbiology and Molecular Biology Reviews: MMBR
https://www.readbyqxmd.com/read/28604164/a-forecast-of-typhoid-conjugate-vaccine-introduction-and-demand-in-typhoid-endemic-low-and-middle-countries-to-support-vaccine-introduction-policy-and-decisions
#10
Vittal Mogasale, Enusa Ramani, Il Yeon Park, Jung Seok Lee
A Typhoid Conjugate Vaccine (TCV) is expected to acquire WHO prequalification soon, which will pave the way for its use in many low- and middle-income countries where typhoid fever is endemic. Thus it is critical to forecast future vaccine demand in order to ensure supply meets demand, and to facilitate vaccine policy and introduction planning. We forecasted introduction dates for countries based on specific criteria and estimated vaccine demand by year for defined vaccination strategies in two scenarios: rapid vaccine introduction and slow vaccine introduction...
June 12, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/28603604/molecular-characterization-of-antimicrobial-resistant-non-typhoidal-salmonella-from-poultry-industries-in-korea
#11
Jin Eui Kim, Young Ju Lee
BACKGROUND: Antimicrobial resistant Salmonella strains are a direct threat to human health when this resistance interferes with treatment and an indirect threat when resistance can be transferred to other human pathogens. The objective of the present study was to characterize antimicrobial resistant non-typhoidal Salmonella (NTS) isolates recovered from poultry industries, including a description of genetic diversity and virulence profiles. RESULTS: In total of 93 Salmonella isolates shown antimicrobial resistance to one or more drugs, all isolates exhibited common resistance to streptomycin, nalidixic acid and cephalothin but no ciprofloxacin resistance...
2017: Irish Veterinary Journal
https://www.readbyqxmd.com/read/28602673/typhoid-spondylodiscitis-mimicking-tuberculosis-in-a-teenage-girl
#12
Barnini Banerjee, Mridula Madiyal, Pai K Madhava, Manali Agarwal, Chiranjay Mukhopadhyay
Salmonella Typhi cause a broad spectrum of human illnesses like gastroenteritis, typhoid fever, and bacteremia. It has also been recognized as a causative organism of osteomyelitis for more than a century but the incidence appears to be uncommon. Microbiological workup plays important role in the diagnosis of Typhoid spondylodiscitis as most of the time it mimics tuberculosis and misguide the clinician, especially in the developing world. Here, we reported an uncommon case of lumbar spondylodiscitis by Salmonella Typhi in an immunocompetent teenager, with the help of clinical, microbiological and radiological evidence...
June 8, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28591163/strong-influence-of-livestock-environments-on-the-emergence-and-dissemination-of-distinct-multidrug-resistant-phenotypes-among-the-population-of-non-typhoidal-salmonella
#13
Ran An, Sahar Alshalchi, Peter Breimhurst, Jeannette Munoz-Aguayo, Christian Flores-Figueroa, Sinisa Vidovic
The problem of emergence and dissemination of multidrug resistance, especially among Gram-negative bacteria, has reached alarming levels. This increases the need to develop surveillance methods that more effectively and accurately provide information about the emergence and spread of multidrug-resistant organisms. In this study, using a well-defined population of non-typhoidal Salmonella (NTS) isolates associated with avian, bovine and porcine hosts, we found that the livestock environments had a specific (P < 0...
2017: PloS One
https://www.readbyqxmd.com/read/28588289/west-nile-virus-infection-in-suspected-febrile-typhoid-cases-in-xinjiang-china
#14
Lei Cao, Shihong Fu, Zhi Lv, Chengjun Tang, Shiheng Cui, Xiaolong Li, Xiaoyan Gao, Minghua Li, Yuxi Cao, Wenwen Lei, Ying He, Huanyu Wang, Guodong Liang
No abstract text is available yet for this article.
June 7, 2017: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/28577141/detection-of-typhoid-fever-by-diatom-based-optical-biosensor
#15
Viji Selvaraj, Anbazhagi Muthukumar, Ponpandian Nagamony, Viswanathan Chinnuswamy
Surface-modified diatom substrates are employed for the development of immunocomplex-based optical biosensor for diagnosis of typhoid. Biosensor has been prepared by covalent immobilization of Salmonella typhi antibody onto the crosslinked diatom substrates via glutaraldehyde. Photoluminescent (PL) studies revealed good specificity and ability of conjugated diatom substrates to distinguish complementary (S. typhi) and non-complementary (Escherichia coli) antigens. The immunocomplexed biosensor showed detection limit of 10 pg...
June 2, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28570694/trends-of-vaccine-preventable-diseases-in-afghanistan-from-the-disease-early-warning-system-2009-2015
#16
Abram L Wagner, Mohammad Y Mubarak, Laura E Johnson, Julia M Porth, Jenna E Yousif, Matthew L Boulton
BACKGROUND: Afghanistan's public health system was neglected during decades of military and civil conflict, and trends in infectious disease occurrence remain poorly characterized. This study examines cyclical and long-term trends of six vaccine-preventable diseases: pneumonia, diarrhea, meningitis, typhoid, measles, and acute viral hepatitis. METHODS: Using weekly data collected between 2009 and 2015 through Afghanistan's Disease Early Warning System, we calculated monthly case counts, and fit a Poisson regression with a Fourier transformation for seasonal cycles and dummy variables for year...
2017: PloS One
https://www.readbyqxmd.com/read/28570603/evolution-of-salmonella-typhi-outer-membrane-protein-specific-t-and-b-cell-responses-in-humans-following-oral-ty21a-vaccination-a-randomized-clinical-trial
#17
Juan Manuel Carreño, Christian Perez-Shibayama, Cristina Gil-Cruz, Constantino Lopez-Macias, Pietro Vernazza, Burkhard Ludewig, Werner C Albrich
Vaccination against complex pathogens such as typhoidal and non-typhoidal Salmonella requires the concerted action of different immune effector mechanisms. Outer membrane proteins (Omps) of Salmonella Typhi are potent immunogens, which elicit long-lasting and protective immunity. Here, we followed the evolution of S. Typhi OmpC and F-specific T and B cell responses in healthy volunteers after vaccination with the vaccine strain Ty21a. To follow humoral and cellular immune responses, pre- and post-vaccination samples (PBMC, serum and stool) collected from 15 vaccinated and 5 non-vaccinated individuals...
2017: PloS One
https://www.readbyqxmd.com/read/28567198/biochemical-derangements-prior-to-emergency-laparotomy-at-queen-elizabeth-central-hospital-blantyre-malawi-a-cross-sectional-pilot-study
#18
Mark G Williams
BACKGROUND: The aim of this study was to examine biochemical investigations not routinely performed prior to emergency laparotomy in patients at Queen Elizabeth Central Hospital, a low-resource public hospital in Blantyre, Malawi. METHODS: A prospective cross-sectional study of adults (N = 15) needing emergency laparotomy over a 4-week period were studied at Queen Elizabeth Central Hospital. Biochemical investigations, not routinely performed for economic reasons, were performed preoperatively; these included sodium, potassium, chloride, carbon dioxide, urea, and calcium levels...
March 2017: Malawi Medical Journal: the Journal of Medical Association of Malawi
https://www.readbyqxmd.com/read/28560124/multidrug-resistant-invasive-nontyphoidal-salmonella-isolated-from-and-masquerading-healed-tubercular-constrictive-pericarditis-and-study-of-virulence-markers
#19
Reetika Dawar, Anoop Ganjoo, Firdaus Imdadi, Vasundhra Bhandari
Among the infectious causes of pericarditis are various bacteria, viruses, fungal and parasitic infections. The course disease may progress to a chronic constrictive pattern especially with tubercular etiology. Non-typhoidal Salmonella has rarely been reported as a cause of pericarditis. We describe here a case from which the pericardial fluid from an old case of tubercular pericarditis sent for culture to microbiology laboratory grew a Salmonella typhimurium. We studied the antibiotic resistance pattern, phage type and virulence factors playing a role in the invasive nature of the pathogen since no such study from pericardial fluid was found in the literature...
April 26, 2017: Curēus
https://www.readbyqxmd.com/read/28559623/rheological-properties-of-reduced-fat-ice-cream-mix-containing-octenyl-succinylated-pearl-millet-starch
#20
Monika Sharma, Ashish K Singh, Deep N Yadav
The octenyl succinyl anhydride (OSA) esterified pearl millet (Pennisetum typhoides) starch was evaluated as fat replacer in soft serve ice cream in comparison to other fat replacers viz. inulin, whey protein concentrate-70 and commercial starch. During temperature sweep test, the yield stress and flow behaviour index of un-pasteurized ice cream mixes increased as the temperature increased from 40 to 80 °C, while the consistency index decreased. Consistency index of aged ice cream mixes containing 2% fat replacer was higher as compared to mixes with 1% level...
May 2017: Journal of Food Science and Technology
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