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https://www.readbyqxmd.com/read/28938533/trans-sialidase-based-vaccine-candidate-protects-against-trypanosoma-cruzi-infection-not-only-inducing-an-effector-immune-response-but-also-affecting-cells-with-regulatory-suppressor-phenotype
#1
Estefanía Prochetto, Carolina Roldán, Iván A Bontempi, Daiana Bertona, Luz Peverengo, Miguel H Vicco, Luz M Rodeles, Ana R Pérez, Iván S Marcipar, Gabriel Cabrera
Prophylactic and/or therapeutic vaccines have an important potential to control Trypanosoma cruzi (T. cruzi)infection. The involvement of regulatory/suppressor immune cells after an immunization treatment and T. cruzi infection has never been addressed. Here we show that a new trans-sialidase-based immunogen (TSf) was able to confer protection, correlating not only with beneficial changes in effector immune parameters, but also influencing populations of cells related to immune control. Regarding the effector response, mice immunized with TSf showed a TS-specific antibody response, significant delayed-type hypersensitivity (DTH) reactivity and increased production of IFN-γ by CD8+ splenocytes...
August 29, 2017: Oncotarget
https://www.readbyqxmd.com/read/28935471/prevalence-and-decay-of-maternal-pneumococcal-and-meningococcal-antibodies-a-meta-analysis-of-type-specific-decay-rates
#2
Merryn Voysey, Andrew J Pollard, Manish Sadarangani, Thomas R Fanshawe
BACKGROUND: At the time of an infant's initial vaccination at age ∼2 to 3months, some infants already have maternal antibodies against vaccine antigens and these can suppress the immune response to vaccination. Modelling the effects of maternal antibody and the timing of infant doses on the antibody response to vaccination, requires estimates of the rate of maternal antibody decay. Decay rates are not well characterised in the medical literature. We investigated variation in the prevalence of maternal anti-capsular pneumococcal and meningococcal antibodies in infants in 14 countries, and estimated type-specific half-lives...
September 18, 2017: Vaccine
https://www.readbyqxmd.com/read/28934424/the-impact-of-hepatitis-b-vaccine-failure-on-long-term-natural-course-of-chronic-hepatitis-b-virus-infection-in-hepatitis-b-e-antigen-seropositive-children
#3
Chi-San Tai, Jia-Feng Wu, Huey-Ling Chen, Yen-Hsuan Ni, Hong-Yuan Hsu, Mei-Hwei Chang
Background: Vaccine failure with chronic hepatitis B virus (HBV) infection still develops in children after universal hepatitis B immunization. This study aimed to investigate the natural course of chronic HBV infection in children with vaccine failure and compare it with that of nonvaccinated children. Methods: Three hundred fifty-six hepatitis B e antigen (HBeAg)-seropositive, hepatitis B surface antigen (HBsAg) carrier children, who were followed for at least 1 year without antiviral therapy, were enrolled...
September 15, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28930165/timeliness-of-childhood-primary-immunization-and-risk-factors-related-with-delays-evidence-from-the-2014-zhejiang-provincial-vaccination-coverage-survey
#4
Yu Hu, Qian Li, Yaping Chen
Background: this study aimed to assess both immunization coverage and timeliness, as well as reasons for non-vaccination, and identity the risk factors of delayed immunization, for the vaccines scheduled during the first year of life, in Zhejiang province, east China. Methods: A cluster survey among children aged 24-35 months was conducted. Demographic information and socio-economic characteristics of the selected child, the mother, and the household were collected. Immunization data were transcribed from immunization cards...
September 20, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28928941/computational-design-of-molecular-motors-as-nanocircuits-in-leishmaniasis
#5
Dipali Kosey, Shailza Singh
Cutaneous leishmaniasis is the most common form of leishmaniasis, caused by Leishmania major and is spread by the bite of a sandfly .This species infects the macrophages and dendritic cells Due to multi-drug resistance, there is a need for a new therapeutic technique. Recently, a novel molecular motor of Leishmania, Myosin XXI, was classified and characterized. In addition, the drug resistance in this organism has been linked with the overexpression of ABC transporters. Systems biology aims to study the simulation and modeling of natural biological systems whereas synthetic biology deals with building novel and artificial biological parts and devices  Together they have contributed enormously to drug discovery, vaccine design and development, infectious disease detection and diagnostics...
2017: F1000Research
https://www.readbyqxmd.com/read/28925647/aseptic-and-bacterial-meningitis-evaluation-treatment-and-prevention
#6
Hillary R Mount, Sean D Boyle
The etiologies of meningitis range in severity from benign and self-limited to life-threatening with potentially severe morbidity. Bacterial meningitis is a medical emergency that requires prompt recognition and treatment. Mortality remains high despite the introduction of vaccinations for common pathogens that have reduced the incidence of meningitis worldwide. Aseptic meningitis is the most common form of meningitis with an annual incidence of 7.6 per 100,000 adults. Most cases of aseptic meningitis are viral and require supportive care...
September 1, 2017: American Family Physician
https://www.readbyqxmd.com/read/28920004/targeting-myeloid-derived-suppressor-cells-with-all-trans-retinoic-acid-is-highly-time-dependent-in-therapeutic-tumor-vaccination
#7
Annkristin Heine, Chrystel Flores, Heidrun Gevensleben, Linda Diehl, Mathias Heikenwalder, Marc Ringelhan, Klaus-Peter Janssen, Ulrich Nitsche, Natalio Garbi, Peter Brossart, Percy A Knolle, Christian Kurts, Bastian Höchst
Tumor immune escape is a critical problem which frequently accounts for the failure of therapeutic tumor vaccines. Among the most potent suppressors of tumor immunity are myeloid derived suppressor cells (MDSCs). MDSCs can be targeted by all-trans-retinoic-acid (atRA), which reduced their numbers and increased response rates in several vaccination studies. However, not much is known about the optimal administration interval between atRA and the vaccine as well as about its mode of action. Here we demonstrate in 2 different murine tumor models that mice unresponsive to a therapeutic vaccine harbored higher MDSC numbers than did responders...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/28918539/accelerating-vaccine-development-during-the-2013-2016-west-african-ebola-virus-disease-outbreak
#8
Elizabeth S Higgs, Sheri A Dubey, Beth A G Coller, Jakub K Simon, Laura Bollinger, Robert A Sorenson, Barthalomew Wilson, Martha C Nason, Lisa E Hensley
The Ebola virus disease outbreak that began in Western Africa in December 2013 was unprecedented in both scope and spread, and the global response was slower and less coherent than was optimal given the scale and pace of the epidemic. Past experience with limited localized outbreaks, lack of licensed medical countermeasures, reluctance by first responders to direct scarce resources to clinical research, community resistance to outside interventions, and lack of local infrastructure were among the factors delaying clinical research during the outbreak...
September 17, 2017: Current Topics in Microbiology and Immunology
https://www.readbyqxmd.com/read/28918040/codon-optimized-p1a-encoding-dna-vaccine-toward-a-therapeutic-vaccination-against-p815-mastocytoma
#9
Alessandra Lopes, Kevin Vanvarenberg, Véronique Préat, Gaëlle Vandermeulen
DNA vaccine can be modified to increase protein production and modulate immune response. To enhance the efficiency of a P815 mastocytoma DNA vaccine, the P1A gene sequence was optimized by substituting specific codons with synonymous ones while modulating the number of CpG motifs. The P815A murine antigen production was increased with codon-optimized plasmids. The number of CpG motifs within the P1A gene sequence modulated the immunogenicity by inducing a local increase in the cytokines involved in innate immunity...
September 15, 2017: Molecular Therapy. Nucleic Acids
https://www.readbyqxmd.com/read/28904678/-epidemiological-profile-of-hemoglobinopathies-a-cross-sectional-and-descriptive-index-case-study
#10
Fatima Dahmani, Souad Benkirane, Jaafar Kouzih, Aziz Woumki, Hassan Mamad, Azlarab Masrar
Hemoglobinopathies are congenital disorders resultimg from hemoglobin abnormalities. Major forms are often severe, their management is difficult and associated with a great psychosocial impact on patients and their families. They are classified as rare diseases and are still insufficiently known by health professionals. This lack of knowledge is at the origin of diagnostic errors, delay in their management and therefore high morbidity and mortality rate for these patients. In 2008, the World Health Organization (WHO) has published data on hemoglobinopathies epidemiology: more than 330...
2017: Pan African Medical Journal
https://www.readbyqxmd.com/read/28904195/vector-order-determines-protection-against-pathogenic-simian-immunodeficiency-virus-infection-in-a-triple-component-vaccine-by-balancing-cd4-and-cd8-t-cell-responses
#11
Ulrike Sauermann, Antonia Radaelli, Nicole Stolte-Leeb, Katharina Raue, Massimiliano Bissa, Carlo Zanotto, Michael Krawczak, Matthias Tenbusch, Klaus Überla, Brandon F Keele, Carlo De Giuli Morghen, Sieghart Sopper, Christiane Stahl-Hennig
An effective AIDS vaccine should elicit strong humoral and cellular immune responses while maintaining low levels of CD4(+) T cell activation to avoid the generation of target cells for viral infection. The present study investigated two prime-boost regimens, both starting vaccination with single cycle immunodeficiency virus, followed by two mucosal boosts either with recombinant adenovirus (rAd) or fowlpox virus (rFWPV) expressing SIVmac239 or SIVmac251 gag/pol and env genes, respectively. Finally, vectors were switched and systemically administered to the reciprocal group of animals...
September 13, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28903749/modelling-the-effects-of-booster-dose-vaccination-schedules-and-recommendations-for-public-health-immunization-programs-the-case-of-haemophilus-influenzae-serotype-b
#12
Nadia A Charania, Seyed M Moghadas
BACKGROUND: Haemophilus influenzae serotype b (Hib) has yet to be eliminated despite the implementation of routine infant immunization programs. There is no consensus regarding the number of primary vaccine doses and an optimal schedule for the booster dose. We sought to evaluate the effect of a booster dose after receiving the primary series on the long-term disease incidence. METHODS: A stochastic model of Hib transmission dynamics was constructed to compare the long-term impact of a booster vaccination and different booster schedules after receiving the primary series on the incidence of carriage and symptomatic disease...
September 13, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28898965/late-boosting-phenomenon-in-tst-conversion-among-health-care-workers
#13
W H Farah, L E Breeher, R D Newcomb, M H Murad, A I S Vaughn, P T Hagen, R G Molella
Background: Available information is insufficient to guide determination of whether tuberculin skin test (TST) conversions of health care workers (HCWs) within 2 years of two-step testing are related to occupational exposures or to other causes, including late boosting. Aims: To describe the epidemiologic factors of TST conversion in HCWs, comparing early TST conversion (≤2 years after two-step testing) with late conversion to possibly distinguish late boosting phenomenon from occupational TST conversion...
August 1, 2017: Occupational Medicine
https://www.readbyqxmd.com/read/28893485/-clinical-characteristics-and-course-of-hand-foot-and-mouth-disease
#14
A Mirand, H Peigue-Lafeuille
Hand, foot and mouth disease (HFMD) and herpangina (HA) are common childhood diseases mostly associated with human enteroviruses (EV). Although usually benign illnesses, neurological complications may be observed during large epidemics when enterovirus A71 (EV-A71) is involved, as observed in the Asia Pacific Region and in China since the late 1990s. The occurrence of these complications warrants reinforcing the surveillance of the emergence of EV-A71 infections in France and Europe. Monitoring EV infections associated with HFMD can be considered as an effective tool to detect an upsurge of EV-A71 infections in a timely manner...
September 8, 2017: Archives de Pédiatrie: Organe Officiel de la Sociéte Française de Pédiatrie
https://www.readbyqxmd.com/read/28888341/hla-based-selection-of-epitopes-offers-a-potential-window-of-opportunity-for-vaccine-design-against-hiv
#15
REVIEW
Jagadish Chandrabose Sundaramurthi, Manickam Ashokkumar, Soumya Swaminathan, Luke Elizabeth Hanna
The pace of progression to AIDS after HIV infection varies from individual to individual. While some individuals develop AIDS quickly, others are protected from the onset of disease for more than a decade (elite controllers and long term non-progressors). The mechanisms of protection are not yet clearly understood, though various factors including host genetics, immune components and virus attenuation have been elucidated partly. The influence of HLA alleles on HIV-1 infection and disease outcome has been studied extensively...
September 6, 2017: Vaccine
https://www.readbyqxmd.com/read/28882440/determinants-of-under-immunization-and-cumulative-time-spent-under-immunized-in-a-quebec-cohort
#16
Shauna O'Donnell, Eve Dubé, Bruce Tapiero, Arnaud Gagneur, Margaret K Doll, Caroline Quach
BACKGROUND: Under-immunization refers to a state of sub-optimal protection against vaccine preventable diseases. Vaccine coverage for age may not capture intentional or non-intentional spacing of vaccines in the recommended provincial immunization guidelines. We aimed to identify factors associated with coverage and under-immunization and to determine the number of days during which children were under-immunized during their first 24months of life. METHODS: Secondary analysis of children ≤3years recruited through active surveillance for gastroenteritis from three Quebec pediatric emergency departments from 2012 to 2014...
September 4, 2017: Vaccine
https://www.readbyqxmd.com/read/28881671/malignant-pericytes-expressing-gt198-give-rise-to-tumor-cells-through-angiogenesis
#17
Liyong Zhang, Yan Wang, Mohammad H Rashid, Min Liu, Kartik Angara, Nahid F Mivechi, Nita J Maihle, Ali S Arbab, Lan Ko
Angiogenesis promotes tumor development. Understanding the crucial factors regulating tumor angiogenesis may reveal new therapeutic targets. Human GT198 (PSMC3IP or Hop2) is an oncoprotein encoded by a DNA repair gene that is overexpressed in tumor stromal vasculature to stimulate the expression of angiogenic factors. Here we show that pericytes expressing GT198 give rise to tumor cells through angiogenesis. GT198(+) pericytes and perivascular cells are commonly present in the stromal compartment of various human solid tumors and rodent xenograft tumor models...
August 1, 2017: Oncotarget
https://www.readbyqxmd.com/read/28876302/seroprevalence-of-chlamydia-trachomatis-in-inner-city-children-and-adolescents-implications-for-vaccine-development
#18
Natalie Banniettis, Sirisha Thumu, Jeremy Weedon, Kobkul Chotikanatis, Aviva Szigeti, Margaret R Hammerschlag, Stephan A Kohlhoff
BACKGROUND: Prevention of Chlamydia trachomatis infection is an ideal application for a vaccine program, which should optimally be administered before sexual debut. However, there are limited epidemiologic studies of C. trachomatis infection in an unselected pediatric population since routine screening and treatment of pregnant women was implemented in the United States in 1993. METHODS: Anonymized serum samples were obtained from children younger than 21 years in 2 medical centers in Brooklyn, New York, from 2013 to 2015...
July 19, 2017: Sexually Transmitted Diseases
https://www.readbyqxmd.com/read/28867845/a-data-platform-to-improve-rabies-prevention-sri-lanka
#19
A Pubudu De Silva, Pa Lionel Harischandra, Abi Beane, Shriyananda Rathnayaka, Ruwini Pimburage, Wageesha Wijesiriwardana, Dilanthi Gamage, Desika Jayasinghe, Chathurani Sigera, Amila Gunasekara, Mizaya Cadre, Sarath Amunugama, Priyantha L Athapattu, K Saroj A Jayasinghe, Arjen M Dondorp, Rashan Haniffa
PROBLEM: In Sri Lanka, rabies prevention initiatives are hindered by fragmented and delayed information-sharing that limits clinicians' ability to follow patients and impedes public health surveillance. APPROACH: In a project led by the health ministry, we adapted existing technologies to create an electronic platform for rabies surveillance. Information is entered by trained clinical staff, and both aggregate and individual patient data are visualized in real time...
September 1, 2017: Bulletin of the World Health Organization
https://www.readbyqxmd.com/read/28856551/u-s-primary-care-clinics-experiences-during-introduction-of-the-9-valent-hpv-vaccine
#20
Melanie L Kornides, William A Calo, Jennifer A Heisler-MacKinnon, Melissa B Gilkey
Changes in the routine immunization schedule are common and may pose challenges to primary care clinics. We sought to assess the experiences of U.S. providers and clinic staff during the introduction of 9-valent HPV vaccine. In 2015-2016, we conducted a survey in a probability sample of 127 pediatric (40%) and family medicine (60%) clinics in three U.S. states. The 211 respondents included clinicians (63%) and staff (37%). Overall, 83% of clinics stocked 9-valent HPV vaccine, with adoption ranging from 60% among early respondents to 100% among later respondents...
August 30, 2017: Journal of Community Health
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