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https://www.readbyqxmd.com/read/28647977/-surveillance-data-on-typhoid-fever-and-paratyphoid-fever-in-2015-china
#1
F F Liu, S L Zhao, Q Chen, Z R Chang, J Zhang, Y M Zheng, L Luo, L Ran, Q H Liao
Objective: Through analyzing the surveillance data on typhoid fever and paratyphoid fever in 2015 to understand the related epidemiological features and most possible clustering areas of high incidence. Methods: Individual data was collected from the passive surveillance program and analyzed by descriptive statistic method. Characteristics on seasonal, regional and distribution of the diseases were described. Spatial-temporal clustering characteristics were estimated, under the retrospective space-time method...
June 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/28640809/development-of-elisas-for-diagnosis-of-acute-typhoid-fever-in-nigerian-children
#2
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
#3
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/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/28617661/molecular-dynamics-approach-to-probe-the-antigenicity-of-pagn-an-outer-membrane-protein-of-salmonella-typhi
#7
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
#8
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
#9
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/28602673/typhoid-spondylodiscitis-mimicking-tuberculosis-in-a-teenage-girl
#10
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/28577141/detection-of-typhoid-fever-by-diatom-based-optical-biosensor
#11
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
#12
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/28551371/an-evaluation-of-purified-salmonella-typhi-protein-antigens-for-the-serological-diagnosis-of-acute-typhoid-fever
#13
Nga Tran Vu Thieu, Tan Trinh Van, Anh Tran Tuan, Elizabeth J Klemm, Chau Nguyen Ngoc Minh, Phat Voong Vinh, Duy Pham Thanh, Thanh Ho Ngoc Dan, Trung Pham Duc, Pinky Langat, Laura B Martin, Jorge Galan, Li Liang, Philip L Felgner, D Huw Davies, Hanna K de Jong, Rapeephan R Maude, Masako Fukushima, Lalith Wijedoru, Aniruddha Ghose, Rasheda Samad, Arjen M Dondorp, Abul Faiz, Thomas C Darton, Andrew J Pollard, Guy E Thwaites, Gordon Dougan, Christopher M Parry, Stephen Baker
OBJECTIVES: The diagnosis of typhoid fever is a challenge. Aiming to develop a typhoid diagnostic we measured antibody responses against Salmonella Typhi (S. Typhi) protein antigens and the Vi polysaccharide in a cohort of Bangladeshi febrile patients. METHODS: IgM against 12 purified antigens and the Vi polysaccharide was measured by ELISA in plasma from patients with confirmed typhoid fever (n = 32), other confirmed infections (n = 17), and healthy controls (n = 40)...
May 25, 2017: Journal of Infection
https://www.readbyqxmd.com/read/28546075/antimicrobial-storage-and-antibiotic-knowledge-in-the-community-a-cross-sectional-pilot-study-in-north-western-angola
#14
Joana Cortez, Edite Rosário, João E Pires, João Taborda Lopes, Moisés Francisco, Erika Vlieghe, Miguel Brito
BACKGROUND: Antimicrobials are drugs that were once lifesavers and mainly curative. Nowadays their value is increasingly under pressure because of the rapid and worldwide emergence of antimicrobial resistance, which, in low-resource settings, frequently occurs in microorganisms that are likely to be transmitted in the community. METHODS: This was a cross-sectional pilot study including 102 households within the 10th Health and Demographic Surveillance System round in Dande, Bengo Province, Angola...
May 22, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28545919/molecular-diagnosis-of-salmonella-typhi-and-its-virulence-in-suspected-typhoid-blood-samples-through-nested-multiplex-pcr
#15
Solai Ramatchandirane Prabagaran, Vellingiri Kalaiselvi, Naganathan Chandramouleeswaran, Krishnan Nair Geetha Deepthi, Kootallur Narayanan Brahmadathan, Mariappa Mani
A nested multiplex polymerase chain reaction (PCR) based diagnosis was developed for the detection of virulent Salmonella typhi in the blood specimens from patients suspected for typhoid fever. After the Widal test, two pairs of primers were used for the detection of flagellin gene (fliC) of S. typhi. Among them, those positive for fliC alone were subjected to identification of genes in Via B operon of Salmonella Pathogenesity Island (SPI-7) where four primer pairs were used to detect tviA and tviB genes. Among 250 blood samples tested, 115 were positive by fliC PCR; 22 of these were negative for tviA and tviB...
May 23, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/28545155/rapid-diagnostic-tests-for-typhoid-and-paratyphoid-enteric-fever
#16
REVIEW
Lalith Wijedoru, Sue Mallett, Christopher M Parry
BACKGROUND: Differentiating both typhoid (Salmonella Typhi) and paratyphoid (Salmonella Paratyphi A) infection from other causes of fever in endemic areas is a diagnostic challenge. Although commercial point-of-care rapid diagnostic tests (RDTs) for enteric fever are available as alternatives to the current reference standard test of blood or bone marrow culture, or to the widely used Widal Test, their diagnostic accuracy is unclear. If accurate, they could potentially replace blood culture as the World Health Organization (WHO)-recommended main diagnostic test for enteric fever...
May 26, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28540296/evaluation-of-the-complex-nomenclature-of-the-clinically-and-veterinary-significant-pathogen-salmonella
#17
REVIEW
Michael P Ryan, Jean O'Dwyer, Catherine C Adley
Salmonella encompasses a vast and highly related population of clinically and veterinary significant pathogens. The genus is responsible for an array of diseases such as typhoid fever and salmonellosis (a variety of illnesses including gastroenteritis), which cause public health issues globally. Even with the global recognition of Salmonella as a significant human and veterinary pathogen, the highly complex and evolving nomenclature system of Salmonella is problematic for clinicians, veterinarians, and microbiologists to comprehend...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28527687/cost-effectiveness-analysis-of-typhoid-conjugate-vaccines-in-five-endemic-low-and-middle-income-settings
#18
Marina Antillón, Joke Bilcke, A David Paltiel, Virginia E Pitzer
BACKGROUND: Typhoid fever remains endemic in low- and middle-income countries. Programmatic use of existing vaccines is limited, but upcoming typhoid conjugate vaccines (TCVs) could warrant wider use. We evaluated the cost-effectiveness of five TCV delivery strategies in three urban areas (Delhi and Kolkata, India and Nairobi, Kenya) and two rural settings (Lwak, Kenya and Dong Thap, Vietnam) with varying incidence. METHODS AND FINDINGS: We evaluated routine infant vaccination with and without catch-up campaigns among older individuals...
June 14, 2017: Vaccine
https://www.readbyqxmd.com/read/28526816/delineation-of-b-cell-epitopes-of-salmonella-enterica-serovar-typhi-hemolysin-e-potential-antibody-therapeutic-target
#19
Chai Fung Chin, Jing Yi Lai, Yee Siew Choong, Amy Amilda Anthony, Asma Ismail, Theam Soon Lim
Hemolysin E (HlyE) is an immunogenic novel pore-forming toxin involved in the pathogenesis of typhoid fever. Thus, mapping of B-cell epitopes of Salmonella enterica serovar Typhi (S. Typhi) is critical to identify key immunogenic regions of HlyE. A random 20-mer peptide library was used for biopanning with enriched anti-HlyE polyclonal antibodies from typhoid patient sera. Bioinformatic tools were used to refine, analyze and map the enriched peptide sequences against the protein to identify the epitopes. The analysis identified both linear and conformational epitopes on the HlyE protein...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28515625/overview-of-the-impact-of-typhoid-and-paratyphoid-fever-utility-of-ty21a-vaccine-vivotif%C3%A2
#20
REVIEW
D Amicizia, L Arata, F Zangrillo, D Panatto, R Gasparini
Cases of diarrhoeal disease number from 1.7 to 5 billion per year worldwide. One of the main causes of diarrhoeal disease is typhoid fever, which is a potentially life-threatening multi-systemic illness. According to the most recent estimates, a total of 26.9 million typhoid fever episodes occurred in 2010. The geographical distribution of the disease differs widely; in developed countries, the incidence rate per 100,000 per year varies from < 0.1 to 0.3, and the disease mainly affects people who travel to endemic areas located in low- and middle-income countries...
March 2017: Journal of Preventive Medicine and Hygiene
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