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typhoid vaccine

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https://www.readbyqxmd.com/read/28303138/importance-of-salmonella-typhi-responsive-cd8-t-cell-immunity-in-a-human-typhoid-fever-challenge-model
#1
Stephanie Fresnay, Monica A McArthur, Laurence S Magder, Thomas C Darton, Claire Jones, Claire S Waddington, Christoph J Blohmke, Brian Angus, Myron M Levine, Andrew J Pollard, Marcelo B Sztein
Typhoid fever, caused by the human-restricted organism Salmonella enterica serovar Typhi (S. Typhi), constitutes a major global health problem. The development of improved attenuated vaccines is pressing, but delayed by the lack of appropriate preclinical models. Herein, we report that high levels of S. Typhi-responsive CD8+ T cells at baseline significantly correlate with an increased risk of disease in humans challenged with a high dose (~10(4) CFU) wild-type S. Typhi. Typhoid fever development was associated with higher multifunctional S...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28289411/immunogenicity-of-a-bivalent-adjuvanted-glycoconjugate-vaccine-against-salmonella-typhimurium-and-salmonella-enteritidis
#2
Fabio Fiorino, Simona Rondini, Francesca Micoli, Luisa Lanzilao, Renzo Alfini, Francesca Mancini, Calman A MacLennan, Donata Medaglini
Salmonella enterica serovars Typhimurium and Enteritidis are the predominant causes of invasive non-typhoidal Salmonella (iNTS) disease. Considering the co-endemicity of S. Typhimurium and S. Enteritidis, a bivalent vaccine formulation against both pathogens is necessary for protection against iNTS disease, thus investigation of glycoconjugate combination is required. In the present work, we investigated the immune responses induced by S. Typhimurium and S. Enteritidis monovalent and bivalent glycoconjugate vaccines adjuvanted with aluminum hydroxide (alum) only or in combination with cytosine-phosphorothioate-guanine oligodeoxynucleotide (CpG)...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28282600/determination-of-free-polysaccharide-in-vi-glycoconjugate-vaccine-against-typhoid-fever
#3
C Giannelli, E Cappelletti, R Di Benedetto, F Pippi, M Arcuri, V Di Cioccio, L B Martin, A Saul, F Micoli
Glycoconjugate vaccines based on the Vi capsular polysaccharide directed against Salmonella enterica serovar Typhi are licensed or in development against typhoid fever, an important cause of morbidity and mortality in developing countries. Quantification of free polysaccharide in conjugate vaccines is an important quality control for release, to monitor vaccine stability and to ensure appropriate immune response. However, we found that existing separation methods based on size are not appropriate as free Vi non-specifically binds to unconjugated and conjugated protein...
February 24, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28268075/vaccination-of-active-component-us-military-personnel-against-salmonella-typhi
#4
Chad K Porter, Tia Sorrell, Indrani Mitra, Mark S Riddle
INTRODUCTION: Vaccination against Salmonella Typhi is one of the leading public health interventions reducing the risk of typhoid fever. There are two available licensed vaccines, Vivotif, oral live-attenuated, and Typhim Vi, intramuscular Vi capsular polysaccharide. The US military is a high risk travel population commonly vaccinated for S. Typhi. We describe the use of S. Typhi vaccination in this population and the acute reactogenicity profile of these vaccines. METHODS: Data were obtained from the Defense Medical Surveillance System and vaccination identified between 1998 and 2011 from vaccination codes...
March 3, 2017: Vaccine
https://www.readbyqxmd.com/read/28241011/the-burden-of-typhoid-fever-in-low-and-middle-income-countries-a-meta-regression-approach
#5
Marina Antillón, Joshua L Warren, Forrest W Crawford, Daniel M Weinberger, Esra Kürüm, Gi Deok Pak, Florian Marks, Virginia E Pitzer
BACKGROUND: Upcoming vaccination efforts against typhoid fever require an assessment of the baseline burden of disease in countries at risk. There are no typhoid incidence data from most low- and middle-income countries (LMICs), so model-based estimates offer insights for decision-makers in the absence of readily available data. METHODS: We developed a mixed-effects model fit to data from 32 population-based studies of typhoid incidence in 22 locations in 14 countries...
February 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28197393/preclinical-efficacy-and-safety-of-the-ty21a-vaccine-strain-for-intravesical-immunotherapy-of-non-muscle-invasive-bladder-cancer
#6
Sonia Domingos-Pereira, Valérie Cesson, Mathieu F Chevalier, Laurent Derré, Patrice Jichlinski, Denise Nardelli-Haefliger
Intravesical Bacillus-Calmette-Guérin (BCG) immunotherapy can reduce recurrence/progression of non-muscle-invasive bladder cancer (NMIBC), although significant adverse events and treatment failure argue for alternative options. Here, we examined whether another attenuated live vaccine, Vivotif/Ty21a, used since more than 30 y against typhoid fever, may be safely used intravesically to improve bladder-tumor treatment. Mice-bearing MB49 orthotopic bladder-tumors treated with intravesical Ty21a or BCG were compared for survival and bacteria recovery...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/28193398/incidence-of-invasive-salmonella-disease-in-sub-saharan-africa-a-multicentre-population-based-surveillance-study
#7
Florian Marks, Vera von Kalckreuth, Peter Aaby, Yaw Adu-Sarkodie, Muna Ahmed El Tayeb, Mohammad Ali, Abraham Aseffa, Stephen Baker, Holly M Biggs, Morten Bjerregaard-Andersen, Robert F Breiman, James I Campbell, Leonard Cosmas, John A Crump, Ligia Maria Cruz Espinoza, Jessica Fung Deerin, Denise Myriam Dekker, Barry S Fields, Nagla Gasmelseed, Julian T Hertz, Nguyen Van Minh Hoang, Justin Im, Anna Jaeger, Hyon Jin Jeon, Leon Parfait Kabore, Karen H Keddy, Frank Konings, Ralf Krumkamp, Benedikt Ley, Sandra Valborg Løfberg, Jürgen May, Christian G Meyer, Eric D Mintz, Joel M Montgomery, Aissatou Ahmet Niang, Chelsea Nichols, Beatrice Olack, Gi Deok Pak, Ursula Panzner, Jin Kyung Park, Se Eun Park, Henintsoa Rabezanahary, Raphaël Rakotozandrindrainy, Tiana Mirana Raminosoa, Tsiriniaina Jean Luco Razafindrabe, Emmanuel Sampo, Heidi Schütt-Gerowitt, Amy Gassama Sow, Nimako Sarpong, Hye Jin Seo, Arvinda Sooka, Abdramane Bassiahi Soura, Adama Tall, Mekonnen Teferi, Kamala Thriemer, Michelle R Warren, Biruk Yeshitela, John D Clemens, Thomas F Wierzba
BACKGROUND: Available incidence data for invasive salmonella disease in sub-Saharan Africa are scarce. Standardised, multicountry data are required to better understand the nature and burden of disease in Africa. We aimed to measure the adjusted incidence estimates of typhoid fever and invasive non-typhoidal salmonella (iNTS) disease in sub-Saharan Africa, and the antimicrobial susceptibility profiles of the causative agents. METHODS: We established a systematic, standardised surveillance of blood culture-based febrile illness in 13 African sentinel sites with previous reports of typhoid fever: Burkina Faso (two sites), Ethiopia, Ghana, Guinea-Bissau, Kenya, Madagascar (two sites), Senegal, South Africa, Sudan, and Tanzania (two sites)...
March 2017: Lancet Global Health
https://www.readbyqxmd.com/read/28193381/typhoid-in-africa-and-vaccine-deployment
#8
Gordon Dougan
No abstract text is available yet for this article.
March 2017: Lancet Global Health
https://www.readbyqxmd.com/read/28182657/modeling-the-potential-for-vaccination-to-diminish-the-burden-of-invasive-non-typhoidal-salmonella-disease-in-young-children-in-mali-west-africa
#9
Kristin Bornstein, Laura Hungerford, David Hartley, John D Sorkin, Milagritos D Tapia, Samba O Sow, Uma Onwuchekwa, Raphael Simon, Sharon M Tennant, Myron M Levine
BACKGROUND: In sub-Saharan Africa, systematic surveillance of young children with suspected invasive bacterial disease (e.g., septicemia, meningitis) has revealed non-typhoidal Salmonella (NTS) to be a major pathogen exhibiting high case fatality (~20%). Where infant vaccination against Haemophilus influenzae type b (Hib) and Streptococcus pneumoniae has been introduced to prevent invasive disease caused by these pathogens, as in Bamako, Mali, their burden has decreased markedly. In parallel, NTS has become the predominant invasive bacterial pathogen in children aged <5 years...
February 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28167670/salmonella-typhi-lipopolysaccharide-o-antigen-modifications-impact-on-serum-resistance-and-antibody-recognition
#10
Erica Kintz, Christian Heiss, Ian Black, Nicholas Donohue, Naj Brown, Mark R Davies, Parastoo Azadi, Stephen Baker, Paul M Kaye, Marjan van der Woude
Salmonella Typhi is a human restricted Gram-negative bacterial pathogen, responsible for causing an estimated 27 million cases of typhoid fever annually leading to 217,000 deaths, and current vaccines do not offer full protection. The O-antigen side chain of the lipopolysaccharide is an immunodominant antigen, can define host-pathogen interactions, and is under consideration as a vaccine target for some Gram-negative species. The composition of the O-antigen can be modified by activity of glycosyltransferase (gtr) operons acquired by horizontal gene transfer...
February 6, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28162821/safety-of-live-vaccinations-on-immunosuppressive-therapy-in-patients-with-immune-mediated-inflammatory-diseases-solid-organ-transplantation-or-after-bone-marrow-transplantation-a-systematic-review-of-randomized-trials-observational-studies-and-case-reports
#11
REVIEW
Evelina Croce, Christoph Hatz, Emile F Jonker, L G Visser, Veronika K Jaeger, Silja Bühler
BACKGROUND: Live vaccines are generally contraindicated on immunosuppressive therapy due to safety concerns. However, data are limited to corroborate this practice. OBJECTIVES: To estimate the safety of live vaccinations in patients with immune-mediated inflammatory diseases (IMID) or solid organ transplantation (SOT) on immunosuppressive treatment and in patients after bone-marrow transplantation (BMT). DATA SOURCES: A search was conducted in electronic databases (Cochrane, Pubmed, Embase) and additional literature was identified by targeted searches...
March 1, 2017: Vaccine
https://www.readbyqxmd.com/read/28060810/whole-genome-sequence-analysis-of-salmonella-typhi-isolated-in-thailand-before-and-after-the-introduction-of-a-national-immunization-program
#12
Zoe A Dyson, Duy Pham Thanh, Ladaporn Bodhidatta, Carl Jeffries Mason, Apichai Srijan, Maia A Rabaa, Phat Voong Vinh, Tuyen Ha Thanh, Guy E Thwaites, Stephen Baker, Kathryn E Holt
Vaccines against Salmonella Typhi, the causative agent of typhoid fever, are commonly used by travellers, however, there are few examples of national immunization programs in endemic areas. There is therefore a paucity of data on the impact of typhoid immunization programs on localised populations of S. Typhi. Here we have used whole genome sequencing (WGS) to characterise 44 historical bacterial isolates collected before and after a national typhoid immunization program that was implemented in Thailand in 1977 in response to a large outbreak; the program was highly effective in reducing typhoid case numbers...
January 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27992422/role-of-t3ss-1-sipd-protein-in-protecting-mice-against-non-typhoidal-salmonella-typhimurium
#13
Bakhos Jneid, Karine Moreau, Marc Plaisance, Audrey Rouaix, Julie Dano, Stéphanie Simon
BACKGROUND: Salmonella enterica species are enteric pathogens that cause severe diseases ranging from self-limiting gastroenteritis to enteric fever and sepsis in humans. These infectious diseases are still the major cause of morbidity and mortality in low-income countries, especially in children younger than 5 years and immunocompromised adults. Vaccines targeting typhoidal diseases are already marketed, but none protect against non-typhoidal Salmonella. The existence of multiple non-typhoidal Salmonella serotypes as well as emerging antibiotic resistance highlight the need for development of a broad-spectrum protective vaccine...
December 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27960239/histopathology-of-vaccine-preventable-diseases
#14
REVIEW
Isaac H Solomon, Danny A Milner
The widespread use of vaccines has been one of the most important medical advances in the last century, saving trillions of dollars and millions of lives. Despite local eradication of some infections, travellers returning from affected areas may cause outbreaks through reintroduction of pathogens to individuals who are unable to receive vaccines for medical reasons or who have declined vaccination for non-medical reasons. Infections that would otherwise be uncommonly encountered by anatomical pathologists should therefore remain in the differential diagnosis for immunocompromised and unvaccinated patients...
January 2017: Histopathology
https://www.readbyqxmd.com/read/27919235/geographical-distribution-of-typhoid-risk-factors-in-low-and-middle-income-countries
#15
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/27905890/low-and-declining-attack-rates-of-imported-typhoid-fever-in-the-netherlands-1997-2014-in-spite-of-a-restricted-vaccination-policy
#16
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/27893465/accelerated-resolution-of-inflammation-underlies-sex-differences-in-inflammatory-responses-in-humans
#17
Krishnaraj S Rathod, Vikas Kapil, Shanti Velmurugan, Rayomand S Khambata, Umme Siddique, Saima Khan, Sven Van Eijl, Lorna C Gee, Jascharanpreet Bansal, Kavi Pitrola, Christopher Shaw, Fulvio D'Acquisto, Romain A Colas, Federica Marelli-Berg, Jesmond Dalli, Amrita Ahluwalia
BACKGROUND: Cardiovascular disease occurs at lower incidence in premenopausal females compared with age-matched males. This variation may be linked to sex differences in inflammation. We prospectively investigated whether inflammation and components of the inflammatory response are altered in females compared with males. METHODS: We performed 2 clinical studies in healthy volunteers. In 12 men and 12 women, we assessed systemic inflammatory markers and vascular function using brachial artery flow-mediated dilation (FMD)...
January 3, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/27869515/vi-capsular-polysaccharide-synthesis-virulence-and-application
#18
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/27825318/prevalence-of-malaria-typhoid-toxoplasmosis-and-rubella-among-febrile-children-in-cameroon
#19
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/27803169/development-of-a-live-attenuated-bivalent-oral-vaccine-against-shigella-sonnei-shigellosis-and-typhoid-fever
#20
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
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