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https://www.readbyqxmd.com/read/29776750/safety-and-immunogenicity-of-a-vi-dt-typhoid-conjugate-vaccine-phase-i-trial-in-healthy-filipino-adults-and-children
#1
Maria Rosario Capeding, Samuel Teshome, Tarun Saluja, Khalid Ali Syed, Deok Ryun Kim, Ju Yeon Park, Jae Seung Yang, Yang Hee Kim, Jiwook Park, Sue-Kyoung Jo, Yun Chon, Sudeep Kothari, Seon-Young Yang, Dong Soo Ham, Ji Hwa Ryu, Hee-Seong Hwang, Ju-Hwan Mun, Julia Lynch, Jerome Kim, Hun Kim, Jean-Louis Excler, Sushant Sahastrabuddhe
BACKGROUND: Typhoid fever remains a major public health problem in low- and middle-income countries where children aged 2-14 years bear the greatest burden. Vi polysaccharide is poorly immunogenic in children <2 years of age, and protection in adults is modest. The limitations of Vi polysaccharide vaccines can be overcome by conjugation of the Vi to a carrier protein. A typhoid conjugate vaccine composed of Vi polysaccharide conjugated to diphtheria toxoid (Vi-DT) has been developed...
May 15, 2018: Vaccine
https://www.readbyqxmd.com/read/29766614/non-inferiority-trials-in-oral-medicine
#2
Jose Leopoldo Ferreira Antunes, Carina Domaneschi, Celso Augusto Lemos
More than a century ago, Greenwood and Yule (1915) published a seminal paper explaining the epidemiological assessment of vaccine effectiveness. To illustrate their argument, they compared the incidence of typhoid fever among vaccinated and non-vaccinated British troops stationed in France and Belgium, based on the previously available information.Little consideration was given to issues that we would care so much afterward; nothing was said about why and how some were, and others were not vaccinated. This article is protected by copyright...
May 15, 2018: Oral Diseases
https://www.readbyqxmd.com/read/29764520/investigation-of-a-typhoid-fever-epidemic-in-moyale-sub-county-kenya-2014-2015
#3
Dahabo Adi Galgallo, Zeinab Gura Roka, Waqo G Boru, Khalumi Abill, James Ransom
AIM: Typhoid fever is a vaccine-preventable bacterial disease that causes significant morbidity and mortality throughout Africa. This paper describes an upsurge of typhoid fever cases in Moyale Sub-County (MSC), Kenya, 2014-2015. METHODS: We conducted active hospital and health facility surveillance and laboratory and antimicrobial sensitivity testing for all patients presenting with headache, fever, stomach pains, diarrhea, or constipation at five MSC health facilities between December 2014 and January 2015...
May 15, 2018: Journal of Health, Population, and Nutrition
https://www.readbyqxmd.com/read/29755189/roles-of-the-crp-and-sipb-genes-of-salmonella-enterica-serovar-typhimurium-in-protective-efficacy-and-immune-responses-to-vaccination-in-mice
#4
Songbiao Chen, Chengshui Liao, Chunjie Zhang, Xiangchao Cheng
Salmonella enterica serovar Typhimurium has a wide host range and is capable of causing infections ranging from severe gastroenteritis to systemic infection in humans. To determine if attenuated S. Typhimurium strains can serve as safe and effective oral vaccines to prevent typhoid fever, the biologic characteristics of crp and sipB deletion mutants were evaluated. Previous studies had found that the crp and sipB genes are related to Salmonella pathogenicity. In this study, cytotoxicity, protective efficacy, and immune responses of the host were analyzed...
April 2018: Canadian Journal of Veterinary Research, Revue Canadienne de Recherche Vétérinaire
https://www.readbyqxmd.com/read/29746945/activation-of-coagulation-and-endothelium-with-concurrent-impairment-of-anticoagulant-mechanisms-in-patients-with-typhoid-fever
#5
Hanna K de Jong, Chris M Parry, Thomas W van der Vaart, Liesbeth M Kager, Stannie J van den Ende, Rapeephan R Maude, Lalith Wijedoru, Aniruddha Ghose, Mohammed U Hasan, Mohammed A Hossain, Arjan M Dondorp, Steve Baker, M Abul Faiz, Joost C M Meijers, W Joost Wiersinga
OBJECTIVES: Typhoid fever caused by Salmonella Typhi remains a major burden worldwide. Gastrointestinal bleeding can be seen in up to 10 percent of patients and may be fatal. The coagulopathy, which may be the driver of this severe complication in patients with typhoid fever, however is ill defined. The aim of this study was to evaluate the activation of coagulation, anticoagulation, and fibrinolysis in patients with acute typhoid fever. METHODS: . Parameters of coagulation and fibrinolysis were measured in 28 hospitalized patients with culture-confirmed or PCR-confirmed typhoid fever and compared to 38 age- and sex-matched healthy volunteers...
May 7, 2018: Journal of Infection
https://www.readbyqxmd.com/read/29746615/what-is-the-best-immunization-strategy-for-protecting-african-children-against-invasive-salmonella-disease
#6
Hyon Jin Jeon, Gi Deok Pak, Justin Im, Ellis Owusu-Dabo, Yaw Adu-Sarkodie, Amy Gassama Sow, Abdramane Soura Bassiahi, Nagla Gasmelseed, Karen H Keddy, Morten Bjerregaard-Andersen, Frank Konings, Abraham Aseffa, John A Crump, Yun Chon, Robert F Breiman, Se Eun Park, Ligia Maria Cruz Espinoza, Hye Jin Seo, Jürgen May, Christian G Meyer, Jason R Andrews, Ursula Panzner, Vera von Kalckreuth, Thomas F Wierzba, Raphaël Rakotozandrindrainy, Gordon Dougan, Myron M Levine, Joachim Hombach, Jerome H Kim, John D Clemens, Stephen Baker, Florian Marks
Background: The WHO recently prequalified a typhoid conjugate vaccine (TCV), recommending its use in persons aged ≥6 months to 45 years residing in typhoid fever (TF)-endemic areas. We now need to consider how TCVs can have the greatest impact in the most vulnerable populations in Africa. Methods: The Typhoid Fever Surveillance in Africa Program (TSAP) in 10 sub-Saharan African countries included blood culture-based surveillance in febrile people presenting at healthcare-facilities originating from defined catchment areas...
May 9, 2018: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29735830/changing-trends-of-culture-positive-typhoid-fever-and-antimicrobial-susceptibility-in-a-tertiary-care-north-indian-hospital-over-the-last-decade
#7
Priyanka Sharma, Sushila Dahiya, Neelam Manral, Bhavana Kumari, Sambuddha Kumar, Sangeeta Pandey, Seema Sood, Bimal Kumar Das, Arti Kapil
Purpose: The present study was undertaken to analyse the trend in prevalence of culture-positive typhoid fever during the last decade and to determine antimicrobial susceptibility profile of Salmonella Typhi and Salmonella Paratyphi A isolated from patients of enteric fever presenting to our hospital. Methods: All the culture-positive enteric fever cases during 2005-2016 presenting to our Hospital were included in the study. Antimicrobial susceptibility was done against chloramphenicol, amoxicillin, co-trimoxazole, ciprofloxacin, ofloxacin, levofloxacin, pefloxacin, ceftriaxone and azithromycin as per corresponding CLSI guidelines for each year...
January 2018: Indian Journal of Medical Microbiology
https://www.readbyqxmd.com/read/29735417/salmonella-typhi-colonization-provokes-extensive-transcriptional-changes-aimed-at-evading-host-mucosal-immune-defense-during-early-infection-of-human-intestinal-tissue
#8
K P Nickerson, S Senger, Y Zhang, R Lima, S Patel, L Ingano, W A Flavahan, D K V Kumar, C M Fraser, C S Faherty, M B Sztein, M Fiorentino, A Fasano
Commensal microorganisms influence a variety of host functions in the gut, including immune response, glucose homeostasis, metabolic pathways and oxidative stress, among others. This study describes how Salmonella Typhi, the pathogen responsible for typhoid fever, uses similar strategies to escape immune defense responses and survive within its human host. To elucidate the early mechanisms of typhoid fever, we performed studies using healthy human intestinal tissue samples and "mini-guts," organoids grown from intestinal tissue taken from biopsy specimens...
April 12, 2018: EBioMedicine
https://www.readbyqxmd.com/read/29725797/management-and-outcomes-following-surgery-for-gastrointestinal-typhoid-an-international-prospective-multicentre-cohort-study
#9
(no author information available yet)
BACKGROUND: Gastrointestinal perforation is the most serious complication of typhoid fever, with a high disease burden in low-income countries. Reliable, prospective, contemporary surgical outcome data are scarce in these settings. This study aimed to investigate surgical outcomes following surgery for intestinal typhoid. METHODS: Two multicentre, international prospective cohort studies of consecutive patients undergoing surgery for gastrointestinal typhoid perforation were conducted...
May 3, 2018: World Journal of Surgery
https://www.readbyqxmd.com/read/29724223/estimating-the-incidence-of-enteric-fever-in-children-in-india-a-multi-site-active-fever-surveillance-of-pediatric-cohorts
#10
Jacob John, Ashish Bavdekar, Temsunaro Rongsen-Chandola, Shanta Dutta, Gagandeep Kang
BACKGROUND: Salmonella Typhi is responsible for about 20 million episodes of illness and over 140,000 deaths annually globally. South Asia has the highest documented burden of typhoid and is home to the multi-drug resistant H58 strain that makes treatment more challenging. The WHO recommends the use of Typhoid Conjugate Vaccines in typhoid endemic countries. Decisions on the preferred immunization strategy should be based on an analysis of disease burden, availability, affordability, and operational feasibility...
May 3, 2018: BMC Public Health
https://www.readbyqxmd.com/read/29720736/seasonal-dynamics-of-typhoid-and-paratyphoid-fever
#11
Neil J Saad, Victoria D Lynch, Marina Antillón, Chongguang Yang, John A Crump, Virginia E Pitzer
Typhoid and paratyphoid fever may follow a seasonal pattern, but this pattern is not well characterized. Moreover, the environmental drivers that influence seasonal dynamics are not fully understood, although increasing evidence suggests that rainfall and temperature may play an important role. We compiled a database of typhoid, paratyphoid, or enteric fever and their potential environmental drivers. We assessed the seasonal dynamics by region and latitude, quantifying the mean timing of peak prevalence and seasonal variability...
May 2, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29709977/report-of-relapse-typhoid-fever-cases-from-kolkata-india-recrudescence-or-reinfection
#12
Sriparna Samajpati, Surojit Das, Ujjwayini Ray, Shanta Dutta
Three relapse cases out of 107 hospital attending typhoid cases within a period of 2 years (2014-2016) from Apollo Geneagles hospital, Kolkata, India were reported. Of three cases, two were treated with ceftriaxone for 7 days and one was for 14 days in the first episode of typhoid fever. Six Salmonella Typhi (S. Typhi) isolates, obtained from three patients in both the episodes, were subjected to antimicrobial susceptibility test (AST), detection of QRDR mutation and molecular subtyping by PFGE, MLVA, MLST, CRISPR and H58 haplotyping...
April 27, 2018: Japanese Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29703142/identification-of-new-loci-involved-in-the-host-susceptibility-to-salmonella-typhimurium-in-collaborative-cross-mice
#13
Jing Zhang, Danielle Malo, Richard Mott, Jean-Jacques Panthier, Xavier Montagutelli, Jean Jaubert
BACKGROUND: Salmonella is a Gram-negative bacterium causing a wide range of clinical syndromes ranging from typhoid fever to diarrheic disease. Non-typhoidal Salmonella (NTS) serovars infect humans and animals, causing important health burden in the world. Susceptibility to salmonellosis varies between individuals under the control of host genes, as demonstrated by the identification of over 20 genetic loci in various mouse crosses. We have investigated the host response to S. Typhimurium infection in 35 Collaborative Cross (CC) strains, a genetic population which involves wild-derived strains that had not been previously assessed...
April 27, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29688492/adverse-events-in-vaccinations-for-travelers-a-1-year-prospective-survey-in-a-travel-clinic-in-germany
#14
Günther Slesak, Ralf Fleck, Helmut Scherbaum, Gunnar Blumenstock, Johannes Schäfer
Background: The study goal was to assess and compare adverse events (AE) of current vaccinations for travelers under 'real-life conditions'. Methods: A prospective observational online questionnaire study was performed from May 2015 till April 2016 in a travel clinic in Germany. Online questionnaire links were sent 1 week after the first vaccination date. Severity was rated on a scale from 1 to 5 (minor to very severe AE). Results: Of 1357 vaccinees 781 (57...
January 1, 2018: Journal of Travel Medicine
https://www.readbyqxmd.com/read/29684022/open-label-comparative-trial-of-mono-versus-dual-antibiotic-therapy-for-typhoid-fever-in-adults
#15
Niv Zmora, Sudeep Shrestha, Ami Neuberger, Yael Paran, Rajendra Tamrakar, Ashish Shrestha, Surendra K Madhup, T R S Bedi, Rajendra Koju, Eli Schwartz
BACKGROUND: Emerging resistance to antibiotics renders therapy of Typhoid Fever (TF) increasingly challenging. The current single-drug regimens exhibit prolonged fever clearance time (FCT), imposing a great burden on both patients and health systems, and potentially contributing to the development of antibiotic resistance and the chronic carriage of the pathogens. The aim of our study was to assess the efficacy of combining third-generation cephalosporin therapy with azithromycin on the outcomes of TF in patients living in an endemic region...
April 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29684021/laboratory-and-molecular-surveillance-of-paediatric-typhoidal-salmonella-in-nepal-antimicrobial-resistance-and-implications-for-vaccine-policy
#16
Carl D Britto, Zoe A Dyson, Sebastian Duchene, Michael J Carter, Meeru Gurung, Dominic F Kelly, David R Murdoch, Imran Ansari, Stephen Thorson, Shrijana Shrestha, Neelam Adhikari, Gordon Dougan, Kathryn E Holt, Andrew J Pollard
BACKGROUND: Children are substantially affected by enteric fever in most settings with a high burden of the disease, including Nepal. However pathogen population structure and transmission dynamics are poorly delineated in young children, the proposed target group for immunization programs. Here we present whole genome sequencing and antimicrobial susceptibility data on 198 S. Typhi and 66 S. Paratyphi A isolated from children aged 2 months to 15 years of age during blood culture surveillance at Patan Hospital, Nepal, 2008-2016...
April 23, 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29681410/development-of-a-bivalent-conjugate-vaccine-candidate-against-malaria-transmission-and-typhoid-fever
#17
So Jung An, Puthupparampil V Scaria, Beth Chen, Emma Barnafo, Olga Muratova, Charles Anderson, Lynn Lambert, Myung Hwa Chae, Jae Seung Yang, Patrick E Duffy
Immune responses to poorly immunogenic antigens, such as polysaccharides, can be enhanced by conjugation to carriers. Our previous studies indicate that conjugation to Vi polysaccharide of Salmonella Typhi may also enhance immunogenicity of some protein carriers. We therefore explored the possibility of generating a bivalent vaccine against Plasmodium falciparum malaria and typhoid fever, which are co-endemic in many parts of the world, by conjugating Vi polysaccharide, an approved antigen in typhoid vaccine, to Pfs25, a malaria transmission blocking vaccine antigen in clinical trials...
April 19, 2018: Vaccine
https://www.readbyqxmd.com/read/29666727/typhoid-fever-due-to-extended-spectrum-%C3%AE-lactamase-producing-salmonella-enterica-serovar-typhi-a-case-report-and-literature-review
#18
Abdul Azeez Ahamed Riyaaz, Vindya Perera, Sabaratnam Sivakumaran, Nelun de Silva
Emergence of cephalosporin-resistant strains of Salmonella enterica serovar Typhi is a cause of concern in the management of enteric fever. Cephalosporin resistance in Salmonella species is mainly due to the production of extended-spectrum β -lactamases (ESBLs). The majority of ESBLs in Salmonella enterica serovar Typhi are derivatives of the TEM, SHV, and CTX-M β -lactamase families. Of these, CTX-M appears to be predominant. This paper discusses the detection and molecular characterization of an ESBL-producing Salmonella enterica serovar Typhi strain isolated from a patient who was admitted to a private hospital in Sri Lanka...
2018: Case Reports in Infectious Diseases
https://www.readbyqxmd.com/read/29661581/typhoid-vaccines-who-position-paper-march-2018-recommendations
#19
World Health Organization
This article presented the World Health Organization's (WHO) recommendations on the use of Typhoid vaccines excerpted from the Typhoid vaccines: WHO position paper - March 2018 published in the Weekly Epidemiological Record (World Health Organization, 2018) [1]. This position paper replaces the 2008 WHO position paper on typhoid vaccines (WHO, 2008) [2]. It re-emphasizes the importance of vaccination to control typhoid fever and presents the WHO recommendations on the use of a new generation of typhoid conjugate vaccines...
April 13, 2018: Vaccine
https://www.readbyqxmd.com/read/29649855/a-salmonella-typhi-ghost-induced-by-the-e-gene-of-phage-%C3%AF-x174-stimulates-dendritic-cells-and-efficiently-activates-the-adaptive-immune-response
#20
Gayeon Won, Seong Kug Eo, Sang-Youel Park, Jin Hur, John Hwa Lee
We previously genetically engineered a Salmonella Typhi bacterial ghost (STG) as a novel inactivated vaccine candidate against typhoid fever. The underlying mechanism employed by the ghost to stimulate the adaptive immune response remains to be investigated. In this study, we aimed to evaluate the immunostimulatory effect of STG on mouse bone marrow-derived dendritic cells (BMDCs) and its activation of the adaptive immune response in vitro . Immature BMDCs were stimulated with STG, which efficiently stimulated maturation events in BMDCs, as indicated by up-regulated expression of CD40, CD80, and MHC-II molecules on CD11+ BMDCs...
April 12, 2018: Journal of Veterinary Science
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