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https://www.readbyqxmd.com/read/29236685/origin-and-differentiation-of-human-memory-cd8-t-cells-after-vaccination
#1
Rama S Akondy, Mark Fitch, Srilatha Edupuganti, Shu Yang, Haydn T Kissick, Kelvin W Li, Ben A Youngblood, Hossam A Abdelsamed, Donald J McGuire, Kristen W Cohen, Gabriela Alexe, Shashi Nagar, Megan M McCausland, Satish Gupta, Pramila Tata, W Nicholas Haining, M Juliana McElrath, David Zhang, Bin Hu, William J Greenleaf, Jorg J Goronzy, Mark J Mulligan, Marc Hellerstein, Rafi Ahmed
The differentiation of human memory CD8 T cells is not well understood. Here we address this issue using the live yellow fever virus (YFV) vaccine, which induces long-term immunity in humans. We used in vivo deuterium labelling to mark CD8 T cells that proliferated in response to the virus and then assessed cellular turnover and longevity by quantifying deuterium dilution kinetics in YFV-specific CD8 T cells using mass spectrometry. This longitudinal analysis showed that the memory pool originates from CD8 T cells that divided extensively during the first two weeks after infection and is maintained by quiescent cells that divide less than once every year (doubling time of over 450 days)...
December 13, 2017: Nature
https://www.readbyqxmd.com/read/29232397/distribution-and-prevalence-of-vector-borne-diseases-in-california-chipmunks-tamias-spp
#2
Mary H Straub, Austin N Roy, Amanda Martin, Kathleen E Sholty, Nicole Stephenson, Janet E Foley
California, with 13 chipmunk (Tamias) species, has more than any other state or country, occupying habitats ranging from chaparral to the high peaks of the Sierra Nevada. Chipmunks host zoonotic pathogens including Yersinia pestis, Anaplasma phagocytophilum, relapsing fever (RF) Borrelia spp., Borrelia burgdorferi, and spotted fever group (SFG) Rickettsia species. Chipmunk species are often not differentiated by public health workers, yet different species utilize different ecological niches and may have intrinsically different capacities for maintaining vector-borne pathogens and infecting vectors...
2017: PloS One
https://www.readbyqxmd.com/read/29231157/plant-produced-subunit-vaccine-candidates-against-yellow-fever-induce-virus-neutralizing-antibodies-and-confer-protection-against-viral-challenge-in-animal-models
#3
Stephen Tottey, Yoko Shoji, R Mark Jones, Jessica A Chichester, Brian J Green, Konstantin Musiychuk, Huaxin Si, Slobodanka Manceva, Amy Rhee, Moneim Shamloul, Joey Norikane, Rosane C Guimarães, Elena Caride, Andrea N M R Silva, Marisol Simões, Patricia C C Neves, Renato Marchevsky, Marcos S Freire, Stephen J Streatfield, Vidadi Yusibov
Yellow fever (YF) is a viral disease transmitted by mosquitoes and endemic mostly in South America and Africa with 20-50% fatality. All current licensed YF vaccines, including YF-Vax® (Sanofi-Pasteur, France) and 17DD-YFV (Bio-Manguinhos, Brazil), are based on live attenuated virus produced in hens' eggs and have been widely used. The YF vaccines are considered safe and highly effective. However, a recent increase in demand for YF vaccines and reports of rare cases of YF vaccine-associated fatal adverse events have provoked interest in developing a safer YF vaccine that can be easily scaled up to meet this increased global demand...
December 11, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29227202/challenges-of-vaccine-development-for-zika-virus
#4
Marcia A Blackman, In-Jeong Kim, Jr-Shiuan Lin, Stephen J Thomas
The emergence of outbreaks of Zika virus (ZIKV) in Brazil in 2015 was associated with devastating effects on fetal development and prompted a world health emergency and multiple efforts to generate an effective vaccine against infection. There are now more than 40 vaccine candidates in preclinical development and six in clinical trials. Despite similarities with other flaviviruses to which successful vaccines have been developed, such as yellow fever virus and Japanese Encephalitis virus, there are unique challenges to the development and clinical trials of a vaccine for ZIKV...
December 11, 2017: Viral Immunology
https://www.readbyqxmd.com/read/29225429/in-silico-validation-of-d7-salivary-protein-derived-b-and-t-cell-epitopes-of-aedes-aegypti-as-potential-vaccine-to-prevent-transmission-of-flaviviruses-and-togaviruses-to-humans
#5
Sathish Sankar, Mageshbabu Ramamurthy, Balaji Nandagopal, Gopalan Sridharan
Mosquito (Aedes aegyptii) salivary proteins play a crucial role in facilitating viral transmission from vector-to-host due to their role in facilitating the "blood meal" of the vector. Three main proteins, D7, aegyptin and Sialokinin play a role in this process. Using in-silico programs, we identified B- and T-cell epitopes in the mosquito salivary proteins D7 long and short form. T-cell epitopes with high affinity to the most prevalent HLA MHC class-I supertypes among different population groups was chosen...
2017: Bioinformation
https://www.readbyqxmd.com/read/29221490/the-first-detected-airline-introductions-of-yellow-fever-mosquitoes-aedes-aegypti-to-europe-at-schiphol-international-airport-the-netherlands
#6
A Ibañez-Justicia, A Gloria-Soria, W den Hartog, M Dik, F Jacobs, A Stroo
BACKGROUND: Air-borne introduction of exotic mosquitoes to Schiphol airport in the Netherlands has been considered plausible based upon findings of mosquitoes in aircraft cabins during 2008, 2010 and 2011. Beginning in 2013, surveillance efforts at Schiphol had focused on promptly detecting accidental introductions at the airport facilities in order to quickly react and avoid temporary proliferation or establishment of mosquito populations, identify the origin of the introductions, and avoid potential transmission of vector-borne diseases...
December 8, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/29217627/the-gastric-caecum-of-larval-aedes-aegypti-stimulation-of-epithelial-ion-transport-by-5-hydroxytryptamine-and-camp
#7
Natalie M D'Silva, Michael J O'Donnell
We report measurements of ion transport across the gastric caecum of larvae of Aedes aegypti, a vector of yellow fever that inhabits a variety of aquatic habitats ranging from freshwater to brackish water. We provide the first measurements of the effect of 5-hydroxytryptamine (5-HT) on transepithelial potential (TEP), luminal ion concentrations and electrochemical potentials, as well as basolateral membrane potential and H+, Na+ and K+ fluxes. TEP, basolateral membrane potential, and H+, K+, and Na+ fluxes across the gastric caeca declined within 3-6 mins after isolation of the entire midgut from the larva...
December 7, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29217414/yellow-fever-vaccine-for-people-living-with-hiv-infection
#8
Lesley Andrews
No abstract text is available yet for this article.
December 4, 2017: Journal of the Association of Nurses in AIDS Care: JANAC
https://www.readbyqxmd.com/read/29217264/the-immune-strategies-of-mosquito-aedes-aegypti-against-microbial-infection
#9
Yan-Hong Wang, Meng-Meng Chang, Xue-Li Wang, Ai-Hua Zheng, Zhen Zou
Yellow fever mosquito Aedes aegypti transmits many devastating arthropod-borne viruses (arboviruses), such as dengue virus, yellow fever virus, Chikungunya virus, and Zika virus, which cause great concern to human health. Mosquito control is an effective method to block the spread of infectious diseases. Ae. aegypti uses its innate immune system to fight against arboviruses, parasites, and fungi. In this review, we briefly summarize the recent findings in the immune response of Ae. aegypti against arboviral and entomopathogenic infections...
December 4, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/29211109/metagenomic-analysis-reveals-hepatitis-a-virus-in-suspected-yellow-fever-cases-in-brazil
#10
Liliane C Conteville, Ana Maria B de Filippis, Rita Maria R Nogueira, Marcos César L de Mendonça, Ana Carolina P Vicente
Using a metagenomic approach, we identified hepatitis A virus among cases of acute febrile illnesses that occurred in 2008-2012 in Brazil suspected as yellow fever. These findings reinforce the challenge facing routine clinical diagnosis in complex epidemiological scenarios.
January 2018: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/29207746/dengue-stings-the-eye
#11
Sumana J Kamath, Madhurima K Nayak, Ruchi Gour, Neha Singh
Dengue is a vector borne viral fever and has varied ocular affections. We report two cases of Dengue Associated Maculopathy (DAM). The first patient was a 22-year-old lady with dengue fever, presented with diminution of vision in the left eye with best corrected visual acuity of 20/40. Fundus revealed soft exudates and streak haemorrhages at the macula in the left eye. Optical Coherence Tomography (OCT) showed cystoid macular oedema. She recovered completely within four days. The second patient was a 33-year-old lady with dengue, with blurred vision in the left eye and with a visual acuity of 20/80...
September 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/29196275/global-risk-mapping-for-major-diseases-transmitted-by-aedes-aegypti-and-aedes-albopictus
#12
Samson Leta, Tariku Jibat Beyene, Eva M De Clercq, Kebede Amenu, Crawford Revie
OBJECTIVES: The objective of this study was to map the global risk of the major arboviral diseases transmitted by Aedes aegypti and Ae. albopictus by identifying areas where the diseases are reported either through active transmission or travel related outbreaks, as well as areas where the diseases are not currently reported but are nonetheless suitable for the vector. METHODS: This study extracts data from some of the largest contemporary databases relating to five arboviral diseases (Zika, dengue fever, chikungunya, yellow fever and RVF) and pairs these data with the known distribution of their vectors, Ae...
November 28, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/29193680/larvicidal-and-residual-activity-of-imidazolium-salts-against-aedes-aegypti-diptera-culicidae
#13
Emanuelle Goellner, Ademir Tramontini Schmitt, Júlia Lacerda Couto, Nicolas Drumm Müller, Harry Luiz Pilz Junior, Henri Stephan Schrekker, Carlos Eugenio Silva, Onilda Santos da Silva
BACKGROUND: Aedes aegypti is an important species of mosquito, which can transmit several arboviruses such as Dengue fever, Yellow fever, Chikungunya, and Zika. As these mosquitoes are becoming resistant to most chemical insecticides used in the world, studies with new larvicides should be prioritized. Based on the known biological profile of imidazolium salts (IS), the objective of this study was to evaluate the potential of six IS as larvicides against Ae. aegypti, which was tested against Ae...
November 28, 2017: Pest Management Science
https://www.readbyqxmd.com/read/29188069/simultaneous-isolation-of-chryseobacterium-gleum-from-bloodstream-and-respiratory-tract-first-case-report-from-india
#14
Vidhi Jain, Nayani Amrin Fatema Afzal Hussain, Tasneem Siddiqui, Chinmoy Sahu, Malay Ghar, Kashi Nath Prasad
Introduction. Species of the genus Chryseobacterium are emerging healthcare-associated pathogens, often colonizing the hospital environment. There are no clear guidelines available for antimicrobial susceptibility of this organism. In this report we present the first case, to our knowledge, of simultaneous central-line-associated bloodstream infection (CLABSI) and ventilator-associated pneumonia (VAP) due to Chryseobacterium gleum from India. Case presentation. A 62 years old man with a history of a road traffic accident 1 month previously was referred to our center for further management...
October 2017: JMM Case Reports
https://www.readbyqxmd.com/read/29187150/identification-of-pathogens-for-differential-diagnosis-of-fever-with-jaundice-in-the-central-african-republic-a-retrospective-assessment-2008-2010
#15
Christelle Luce Bobossi Gadia, Alexandre Manirakiza, Gaspard Tekpa, Xavier Konamna, Ulrich Vickos, Emmanuel Nakoune
BACKGROUND: Febrile jaundice results clinically in generalized yellow coloration of the teguments and mucous membranes due to excess plasma bilirubin, accompanied by fever. Two types are found: conjugated and unconjugated bilirubin jaundice. Jaundice is a sign in several diseases due to viruses (viral hepatitis and arbovirus), parasites (malaria) and bacteria (leptospirosis). In the Central African Republic (CAR), only yellow fever is included on the list of diseases for surveillance...
November 29, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29186544/characterizing-environmental-suitability-of-aedes-albopictus-diptera-culicidae-in-mexico-based-on-regional-and-global-niche-models
#16
Carlos Yañez-Arenas, Rodolfo Rioja-Nieto, Gerardo A Martín, Felipe Dzul-Manzanilla, Xavier Chiappa-Carrara, Aura Buenfil-Ávila, Pablo Manrique-Saide, Fabián Correa-Morales, José Alberto Díaz-Quiñónez, Crescencio Pérez-Rentería, José Ordoñez-Álvarez, Gonzalo Vazquez-Prokopec, Herón Huerta
The Asian tiger mosquito, Aedes albopictus (Skuse) (Diptera: Culicidae), is an invasive species and a vector of numerous human pathogens, including chikungunya, dengue, yellow fever, and Zika viruses. This mosquito had been reported from 36 geographic locations in Mexico by 2005, increasing to 101 locations by 2010 and 501 locations (spanning 16 states) by 2016. Here we modeled the occupied niche for Ae. albopictus in Mexico to characterize the environmental conditions related to its presence, and to generate updated environmental suitability maps...
November 23, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29185597/urgent-call-for-action-avoiding-spread-and-re-urbanisation-of-yellow-fever-in-brazil
#17
EDITORIAL
Cristina Possas, Reinaldo Menezes Martins, Ricardo Lourenço de Oliveira, Akira Homma
No abstract text is available yet for this article.
November 27, 2017: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/29185596/single-shot-of-17d-vaccine-may-not-confer-life-long-protection-against-yellow-fever
#18
Pedro Fc Vasconcelos
The yellow fever (YF) vaccine has been used since the 1930s to prevent YF, which is a severe infectious disease caused by the yellow fever virus (YFV), and mainly transmitted by Culicidae mosquitoes from the genera Aedes and Haemagogus . Until 2013, the World Health Organization (WHO) recommended the administration of a vaccine dose every ten years. A new recommendation of a single vaccine dose to confer life-long protection against YFV infection has since been established. Recent evidence published elsewhere suggests that at least a second dose is needed to fully protect against YF disease...
November 27, 2017: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/29176643/development-of-a-quantitative-ns1-capture-enzyme-linked-immunosorbent-assay-for-early-detection-of-yellow-fever-virus-infection
#19
Taissa Ricciardi-Jorge, Juliano Bordignon, Andrea Koishi, Camila Zanluca, Ana Luiza Mosimann, Claudia Nunes Duarte Dos Santos
Yellow fever is an arboviral disease that causes thousands of deaths every year in Africa and the Americas. However, few commercial diagnostic kits are available. Non-structural protein 1 (NS1) is an early marker of several flavivirus infections and is widely used to diagnose dengue virus (DENV) infection. Nonetheless, little is known about the dynamics of Yellow fever virus (YFV) NS1 expression and secretion, to encourage its use in diagnosis. To tackle this issue, we developed a quantitative NS1-capture ELISA specific for YFV using a monoclonal antibody and recombinant NS1 protein...
November 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29172941/reporting-of-adverse-events-following-immunizations-in-ghana-using-disproportionality-analysis-reporting-ratios
#20
Daniel N A Ankrah, Delese M Darko, George Sabblah, Aukje Mantel-Teeuwisse, Hubert M G Leufkens
BACKGROUND: Timely reporting of safety information post vaccination is pivotal for the success of any vaccination program. Reports of adverse events following immunization (AEFI) of 6 different vaccinations from Ghana were analysed for signals. METHODS: De-identified data from active surveillance for AEFIs after 2009 AH1N1 influenza, yellow fever, meningitis, measles-rubella, pneumococcal-rotavirus and human papilloma virus vaccinations were used. All vaccinations occurred between January 2010 and December 2013...
November 27, 2017: Human Vaccines & Immunotherapeutics
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