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https://www.readbyqxmd.com/read/29785356/examining-the-potential-for-south-american-arboviruses-to-spread-beyond-the-new-world
#1
Víctor Hugo Peña-García, Michael K McCracken, Rebecca C Christofferson
Zika and chikungunya viruses emerged as public health emergencies in the Western Hemisphere where previously they had not been reported on a large scale. Millions were infected as the viruses met with virtually no herd immunity upon emergence. Purpose of the Review: We explore the histories of these two recent arbovirus experiences in South America. We then review similarly three endemic South American viruses: yellow fever, Oropouche, and Mayaro viruses. Recent Findings: We discuss the commonalities of the transmission systems and the possibility of an atypical emergence, that of New World virus to the Old World...
December 2017: Current Clinical Microbiology Reports
https://www.readbyqxmd.com/read/29782512/regulation-of-midgut-cell-proliferation-impacts-aedes-aegypti-susceptibility-to-dengue-virus
#2
Mabel L Taracena, Vanessa Bottino-Rojas, Octavio A C Talyuli, Ana Beatriz Walter-Nuno, José Henrique M Oliveira, Yesseinia I Angleró-Rodriguez, Michael B Wells, George Dimopoulos, Pedro L Oliveira, Gabriela O Paiva-Silva
Aedes aegypti is the vector of some of the most important vector-borne diseases like dengue, chikungunya, zika and yellow fever, affecting millions of people worldwide. The cellular processes that follow a blood meal in the mosquito midgut are directly associated with pathogen transmission. We studied the homeostatic response of the midgut against oxidative stress, as well as bacterial and dengue virus (DENV) infections, focusing on the proliferative ability of the intestinal stem cells (ISC). Inhibition of the peritrophic matrix (PM) formation led to an increase in reactive oxygen species (ROS) production by the epithelial cells in response to contact with the resident microbiota, suggesting that maintenance of low levels of ROS in the intestinal lumen is key to keep ISCs division in balance...
May 21, 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29781815/lymph-node-fibrosis-a-structural-barrier-to-unleashing-effective-vaccine-immunity
#3
Boris Julg, Galit Alter
There is marked variability in vaccine efficacy among global populations. In particular, individuals in low- to middle-income countries have been shown to be less responsive to vaccines than those from developed nations. Several factors, including endemic infections, nutrition, genetics, and gut microbiome composition, have been proposed to underlie discrepancies in vaccine response. In this issue of the JCI, Kityo et al. evaluated response to yellow fever virus vaccine, inflammation, and lymphatic tissue architecture and fibrosis in three cohorts: two from the U...
May 21, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29774286/biological-control-of-anopheles-darlingi-aedes-aegypti-and-culex-quinquefasciatus-larvae-using-shrimps
#4
Willian Marinho Dourado Coelho, Juliana de Carvalho Apolinário Coêlho, Katia Denise Saraiva Bresciani, Wilma Aparecida Starke Buzetti
Mosquitoes can act as vectors of important diseases such as malaria, dengue, Zika virus, yellow fever, Chikungunya and Mayaro fever, in addition to filariasis. The use of insecticides, larvicides, bed nets and repellents, besides the use of drugs as chemoprevention and the treatment of the sick are currently the pillars of the control of these vectors. We studied the biological control against of Anopheles darlingi , Aedes aegypti and Culex quinquefasciatus larvae using shrimps of the species M. pantanalense , M...
August 2017: Parasite Epidemiology and Control
https://www.readbyqxmd.com/read/29769105/ornamental-bromeliads-of-miami-dade-county-florida-are-important-breeding-sites-for-aedes-aegypti-diptera-culicidae
#5
André B B Wilke, Chalmers Vasquez, Paul J Mauriello, John C Beier
BACKGROUND: A major public health concern is the emergence and geographical spread of vector-borne diseases such as Zika and yellow fever. Ornamental bromeliads retaining water in their leaf axils represent potential breeding sites for mosquitoes. As the role of ornamental bromeliads in breeding Aedes aegypti in Miami-Dade County, Florida is unknown, we hypothesize that ornamental bromeliads are important breeding sites for Ae. aegypti. Our objective was to survey bromeliads in areas with high densities of adult Ae...
May 17, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29768102/identification-of-dengue-and-chikungunya-cases-among-suspected-cases-of-yellow-fever-in-the-democratic-republic-of-the-congo
#6
Sheila Makiala-Mandanda, Steve Ahuka-Mundeke, Jessica L Abbate, Elisabeth Pukuta-Simbu, Justus Nsio-Mbeta, Nicolas Berthet, Eric Maurice Leroy, Pierre Becquart, Jean-Jacques Muyembe-Tamfum
For more than 95% of acute febrile jaundice cases identified through surveillance for yellow fever, a reemerging arthropod-borne viral disease, no etiological exploration is ever done. The aim of this study was to test for other arthropod-borne viruses that can induce the same symptoms in patients enrolled in the yellow fever surveillance in the Democratic Republic of the Congo (DRC). Of 652 patients included in the surveillance of yellow fever in DRC from January 2003 to January 2012, 453 patients that tested negative for yellow fever virus (YFV) immunoglobulin M (IgM) antibodies were selected for the study...
May 16, 2018: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/29757506/controversies-over-the-scientific-name-of-the-principal-mosquito-vector-of-yellow-fever-virus-expediency-versus-validity
#7
Alan N Clements, Ralph E Harbach
The history of the scientific name of the yellow fever mosquito, the vector of yellow fever virus, ranges from 1757 to the early twenty-first century. In his 1757 work Iter Palaestinum, Frederic Hasselquist gave the name Culex aegypti to a mosquito species responsible for fierce attacks on humans in Egypt. That name was never later ascribed to Hasselquist as author, but to Linnaeus, although the name never appeared in any of Linnaeus' publications. In Cuba, at the end of the nineteenth century, the vector of the unknown infectious agent of yellow fever was first identified as Culex mosquito and later more validly named Stegomyia fasciata...
June 2018: Journal of Vector Ecology: Journal of the Society for Vector Ecology
https://www.readbyqxmd.com/read/29757218/detection-of-specific-zikv-igm-in-travelers-using-a-multiplexed-flavivirus-microsphere-immunoassay
#8
Carmel T Taylor, Ian M Mackay, Jamie L McMahon, Sarah L Wheatley, Peter R Moore, Mitchell J Finger, Glen R Hewitson, Frederick A Moore
Zika virus (ZIKV) has spread widely in the Pacific and recently throughout the Americas. Unless detected by RT-PCR, confirming an acute ZIKV infection can be challenging. We developed and validated a multiplexed flavivirus immunoglobulin M (IgM) microsphere immunoassay (flaviMIA) which can differentiate ZIKV-specific IgM from that due to other flavivirus infections in humans. The flaviMIA bound 12 inactivated flavivirus antigens, including those from ZIKV and yellow fever virus (YFV), to distinct anti-flavivirus antibody coupled beads...
May 12, 2018: Viruses
https://www.readbyqxmd.com/read/29751873/acute-viral-hepatitis-beyond-a-b-and-c
#9
REVIEW
Venancio Avancini Ferreira Alves
From the standpoint of the surgical pathologist "hepatitis" is defined as the set of histologic patterns of lesions found in livers infected by hepatotropic viruses, by non-hepatotrophic viruses leading to liver inflammation in the context of systemic infection, or due to an autoimmune disease, drug, or toxin involving the liver. This article is centered on the histologic patterns of injury in acute viral hepatitis, encompassing the hepatotropic viruses A, B, C, D, and E and the "icteric hemorrhagic fevers" (dengue, hantavirus, yellow fever)...
June 2018: Surgical Pathology Clinics
https://www.readbyqxmd.com/read/29743363/comparative-characterization-of-the-sindbis-virus-proteome-from-mammalian-and-invertebrate-hosts-identifies-nsp2-as-a-component-of-the-virus-nucleocapsid-and-sorting-nexin-5-as-a-significant-host-factor-for-alphavirus-replication
#10
Ryan Schuchman, Andy Kilianski, Amanda Piper, Ricardo Vancini, José M C Ribeiro, Thomas R Sprague, Farooq Nasar, Gabrielle Boyd, Raquel Hernandez, Trevor Glaros
Recent advances in mass spectrometry methods and instrumentation now allow for more accurate identification of proteins in low abundance. This technology was applied to Sindbis virus, the prototypical alphavirus to investigate the viral proteome. To determine if host proteins are specifically packaged into alphavirus virions, Sindbis virus (SINV) was grown in multiple host cells representing vertebrate and mosquito hosts and total protein content of purified virions was determined. This analysis identified host factors not previously associated with alphavirus entry, replication, or egress...
May 9, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29723485/late-or-lack-of-vaccination-linked-to-importation-of-yellow-fever-from-angola-to-china
#11
Rui Song, Shengcan Guan, Shui Shan Lee, Zhihai Chen, Chen Chen, Lifen Han, Yanli Xu, Ang Li, Hui Zeng, Hanhui Ye, Fujie Zhang
During March and April 2016, 11 yellow fever cases were identified in China. We report epidemic and viral information for 10 of these patients, 6 of whom had been vaccinated before travel. Phylogenetic analyses suggest these viruses nested within the diversity of strains endemic to Angola, where an outbreak began in 2015.
July 17, 2018: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/29708542/a-simple-flow-cytometry-based-assay-to-determine-in-vitro-antibody-dependent-enhancement-of-dengue-virus-using-zika-virus-convalescent-serum
#12
William G Valiant, Joseph J Mattapallil
Antibody dependent enhancement of infection has been shown to play a major role in Dengue viral pathogenesis. Traditional assays that measure the capacity of antibodies or serum to enhance infection in impermissible cell lines have relied on using viral output in the media followed by plaque assays to quantify infection. More recently, these assays have examined Dengue virus (DENV) infection in the cell lines using fluorescently labeled antibodies. Both these approaches have limitations that restrict the widespread use of these techniques...
April 10, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29706291/characterization-of-recombinant-yellow-fever-dengue-vaccine-viruses-with-human-monoclonal-antibodies-targeting-key-conformational-epitopes
#13
Valerie Lecouturier, Catherine Berry, Aure Saulnier, Sophie Naville, Catherine Manin, Yves Girerd-Chambaz, James E Crowe, Nicholas Jackson, Bruno Guy
The recombinant yellow fever-17D-dengue virus, live, attenuated, tetravalent dengue vaccine (CYD-TDV) is licensed in several dengue-endemic countries. Although the vaccine provides protection against dengue, the level of protection differs by serotype and warrants further investigation. We characterized the antigenic properties of each vaccine virus serotype using highly neutralizing human monoclonal antibodies (hmAbs) that bind quaternary structure-dependent epitopes. Specifically, we monitored the binding of dengue virus-1 (DENV-1; 1F4), DENV-2 (2D22) or DENV-3 (5J7) serotype-specific or DENV-1-4 cross-reactive (1C19) hmAbs to the four chimeric yellow fever-dengue vaccine viruses (CYD-1-4) included in phase III vaccine formulations using a range of biochemical and functional assays (dot blot, ELISA, surface plasmon resonance and plaque reduction neutralization assays)...
April 26, 2018: Vaccine
https://www.readbyqxmd.com/read/29678952/subverting-the-mechanisms-of-cell-death-flavivirus-manipulation-of-host-cell-responses-to-infection
#14
REVIEW
Elisa Vicenzi, Isabel Pagani, Silvia Ghezzi, Sarah L Taylor, Timothy R Rudd, Marcelo A Lima, Mark A Skidmore, Edwin A Yates
Viruses exploit host metabolic and defence machinery for their own replication. The flaviviruses, which include Dengue (DENV), Yellow Fever (YFV), Japanese Encephalitis (JEV), West Nile (WNV) and Zika (ZIKV) viruses, infect a broad range of hosts, cells and tissues. Flaviviruses are largely transmitted by mosquito bites and humans are usually incidental, dead-end hosts, with the notable exceptions of YFV, DENV and ZIKV. Infection by flaviviruses elicits cellular responses including cell death via necrosis, pyroptosis (involving inflammation) or apoptosis (which avoids inflammation)...
April 20, 2018: Biochemical Society Transactions
https://www.readbyqxmd.com/read/29666784/the-immune-responses-of-the-animal-hosts-of-west-nile-virus-a-comparison-of-insects-birds-and-mammals
#15
REVIEW
Laura R H Ahlers, Alan G Goodman
Vector-borne diseases, including arboviruses, pose a serious threat to public health worldwide. Arboviruses of the flavivirus genus, such as Zika virus (ZIKV), dengue virus, yellow fever virus (YFV), and West Nile virus (WNV), are transmitted to humans from insect vectors and can cause serious disease. In 2017, over 2,000 reported cases of WNV virus infection occurred in the United States, with two-thirds of cases classified as neuroinvasive. WNV transmission cycles through two different animal populations: birds and mosquitoes...
2018: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29664379/history-of-mosquitoborne-diseases-in-the-united-states-and-implications-for-new-pathogens
#16
Max J Moreno-Madriñán, Michael Turell
The introduction and spread of West Nile virus and the recent introduction of chikungunya and Zika viruses into the Americas have raised concern about the potential for various tropical pathogens to become established in North America. A historical analysis of yellow fever and malaria incidences in the United States suggests that it is not merely a temperate climate that keeps these pathogens from becoming established. Instead, socioeconomic changes are the most likely explanation for why these pathogens essentially disappeared from the United States yet remain a problem in tropical areas...
May 2018: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/29663859/factors-contributing-to-and-strategies-to-combat-emerging-arboviruses
#17
David Michael Callender
Less than half a century ago infectious diseases appeared to be destined to be extinguished via as a culmination of medical triumphs. As focus turned towards combating non-communicable diseases, emerging and re-emerging diseases (EIDs) have bloomed from those ashes. Five epidemic mosquito-borne arboviruses (Yellow Fever virus (YFV), Dengue virus, West Nile virus, Chikungunya virus, and Zika virus) have emerged in the recent past. Arboviruses are of the utmost importance with respect to EIDs due to intensive growth of globalisation, arthropod urban fitness/adaption, and environmental changes...
April 17, 2018: Global Public Health
https://www.readbyqxmd.com/read/29652486/biochemistry-and-molecular-biology-of-flaviviruses
#18
Nicholas J Barrows, Rafael K Campos, Kuo-Chieh Liao, K Reddisiva Prasanth, Ruben Soto-Acosta, Shih-Chia Yeh, Geraldine Schott-Lerner, Julien Pompon, October M Sessions, Shelton S Bradrick, Mariano A Garcia-Blanco
Flaviviruses, such as dengue, Japanese encephalitis, tick-borne encephalitis, West Nile, yellow fever, and Zika viruses, are critically important human pathogens that sicken a staggeringly high number of humans every year. Most of these pathogens are transmitted by mosquitos, and not surprisingly, as the earth warms and human populations grow and move, their geographic reach is increasing. Flaviviruses are simple RNA-protein machines that carry out protein synthesis, genome replication, and virion packaging in close association with cellular lipid membranes...
April 13, 2018: Chemical Reviews
https://www.readbyqxmd.com/read/29643198/development-of-a-real-time-rt-pcr-assay-for-the-global-differentiation-of-yellow-fever-virus-vaccine-adverse-events-from-natural-infections
#19
Holly R Hughes, Brandy J Russell, Eric C Mossel, John Kayiwa, Julius Lutwama, Amy J Lambert
Yellow fever (YF) is a reemerging public health threat with frequent outbreaks prompting large vaccination campaigns in endemic regions of Africa and South America. Specific detection of vaccine-related adverse events is resource-intensive, time-consuming and difficult to achieve during an outbreak. To address this, we have developed a highly transferable, rapid yellow fever virus (YFV) vaccine-specific real-time RT-PCR assay that distinguishes vaccine from wild-type lineages. The assay utilizes a specific hydrolysis probe that includes locked nucleic acids to enhance specific discrimination of the YFV 17D vaccine strain genome...
April 11, 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29624581/efficacy-of-aedes-aegypti-control-by-indoor-ultra-low-volume-ulv-insecticide-spraying-in-iquitos-peru
#20
Christian E Gunning, Kenichi Okamoto, Helvio Astete, Gissella M Vasquez, Erik Erhardt, Clara Del Aguila, Raul Pinedo, Roldan Cardenas, Carlos Pacheco, Enrique Chalco, Hugo Rodriguez-Ferruci, Thomas W Scott, Alun L Lloyd, Fred Gould, Amy C Morrison
BACKGROUND: Aedes aegypti is a primary vector of dengue, chikungunya, Zika, and urban yellow fever viruses. Indoor, ultra low volume (ULV) space spraying with pyrethroid insecticides is the main approach used for Ae. aegypti emergency control in many countries. Given the widespread use of this method, the lack of large-scale experiments or detailed evaluations of municipal spray programs is problematic. METHODOLOGY/PRINCIPAL FINDINGS: Two experimental evaluations of non-residual, indoor ULV pyrethroid spraying were conducted in Iquitos, Peru...
April 6, 2018: PLoS Neglected Tropical Diseases
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