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https://www.readbyqxmd.com/read/27920393/detection-of-wolbachia-in-aedes-albopictus-and-their-effects-on-chikungunya-virus
#1
Noor Afizah Ahmad, Indira Vythilingam, Yvonne A L Lim, Nur Zatil Aqmar A Zabari, Han Lim Lee
Wolbachia-based vector control strategies have been proposed as a means to augment the currently existing measures for controlling dengue and chikungunya vectors. Prior to utilizing Wolbachia as a novel vector control strategy, it is crucial to understand the Wolbachia-mosquito interactions. In this study, field surveys were conducted to screen for the infection status of Wolbachia in field-collected Aedes albopictus The effects of Wolbachia in its native host toward the replication and dissemination of chikungunya virus (CHIKV) was also studied...
December 5, 2016: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/27920183/chikungunya-in-the-americas-recommendations-and-conclusions
#2
Barney S Graham, Patricia M Repik, Sergio Yactayo
Discovered in 1953, chikungunya virus (CHIKV) circulated in Africa and Southeast Asia, with periodic outbreaks, for many years. Highly efficient transmission following a genetic mutation of the virus in 2005 caused its global spread. Associated with significant morbidity, CHIKV creates a large public health burden, and despite various efforts, there are currently no licensed vaccines nor specific treatments. To garner a better understanding of the virus, identify gaps in knowledge, and guide the development of more-effective interventions, the World Health Organization and National Institute of Allergy and Infectious Diseases assembled global experts for discussion and review...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27920182/monoclonal-antibodies-as-prophylactic-and-therapeutic-agents-against-chikungunya-virus
#3
April M Clayton
Chikungunya virus (CHIKV) is a mosquito-borne alphavirus that is responsible for considerable epidemics worldwide and recently emerged in the Americas in 2013. CHIKV may cause long-lasting arthralgia after acute infection. With currently no licensed vaccines or antivirals, the design of effective therapies to prevent or treat CHIKV infection is of utmost importance and will be facilitated by increased understanding of the dynamics of chikungunya. In this article, monoclonal antibodies against CHIKV as viable prophylactic and therapeutic agents will be discussed...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27920181/chikungunya-virus-vaccines-viral-vector-based-approaches
#4
Katrin Ramsauer, Frédéric Tangy
In 2013, a major chikungunya virus (CHIKV) epidemic reached the Americas. In the past 2 years, >1.7 million people have been infected. In light of the current epidemic, with millions of people in North and South America at risk, efforts to rapidly develop effective vaccines have increased. Here, we focus on CHIKV vaccines that use viral-vector technologies. This group of vaccine candidates shares an ability to potently induce humoral and cellular immune responses by use of highly attenuated and safe vaccine backbones...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27920180/whole-inactivated-and-virus-like-particle-vaccine-strategies-for-chikungunya-virus
#5
Adam D DeZure, Nina M Berkowitz, Barney S Graham, Julie E Ledgerwood
Chikungunya virus (CHIKV) is a global public health threat, having been identified in >60 countries in Asia, Africa, Europe, and the Americas. There is no cure for or licensed vaccine against CHIKV infection. Initial attempts at CHIKV vaccine development began in the early 1960s. Whole-inactivated and virus-like particle (VLP) vaccines are 2 of the current approaches being evaluated. Success of these approaches is dependent on a safe, well-tolerated vaccine that is immunogenic and deployable in regard to manufacturing, stability, and delivery characteristics...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27920179/development-of-vaccines-for-chikungunya-fever
#6
Jesse H Erasmus, Shannan L Rossi, Scott C Weaver
Chikungunya fever, an acute and often chronic arthralgic disease caused by the mosquito-borne chikungunya virus (CHIKV), has reemerged since 2004 to cause millions of cases. Because CHIKV exhibits limited antigenic diversity and is not known to be capable of reinfection, a vaccine could serve to both prevent disease and diminish human amplification during epidemic circulation. Here, we review the many promising vaccine platforms and candidates developed for CHIKV since the 1970s, including several in late preclinical or clinical development...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27920178/animal-models-of-chikungunya-virus-infection-and-disease
#7
Nicole N Haese, Rebecca M Broeckel, David W Hawman, Mark T Heise, Thomas E Morrison, Daniel N Streblow
Chikungunya virus (CHIKV) is a reemerging alphavirus that causes acute febrile illness and severe joint pain in humans. Although acute symptoms often resolve within a few days, chronic joint and muscle pain can be long lasting. In the last decade, CHIKV has caused widespread outbreaks of unprecedented scale in the Americas, Asia, and the Indian Ocean island regions. Despite these outbreaks and the continued expansion of CHIKV into new areas, mechanisms of chikungunya pathogenesis and disease are not well understood...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27920177/surveillance-for-chikungunya-and-dengue-during-the-first-year-of-chikungunya-virus-circulation-in-puerto-rico
#8
Tyler M Sharp, Kyle R Ryff, Luisa Alvarado, Wun-Ju Shieh, Sherif R Zaki, Harold S Margolis, Brenda Rivera-Garcia
After chikungunya virus (CHIKV) transmission was detected in Puerto Rico in May 2014, multiple surveillance systems were used to describe epidemiologic trends and CHIKV-associated disease. Of 28 327 cases reported via passive surveillance, 6472 were tested for evidence of CHIKV infection, and results for 4399 (68%) were positive. Of 250 participants in household cluster investigations, 70 (28%) had evidence of recent CHIKV infection. Enhanced surveillance for chikungunya at 2 hospitals identified 1566 patients who tested positive for CHIKV, of whom 10...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27920176/laboratory-diagnosis-of-chikungunya-virus-infections-and-commercial-sources-for-diagnostic-assays
#9
Barbara W Johnson, Brandy J Russell, Christin H Goodman
Detection of chikungunya virus (CHIKV) or viral RNA is the primary laboratory test used to diagnose infection in serum collected <6 days after onset of illness. Two real-time reverse transcription-polymerase chain reaction (RT-PCR) kits are available commercially, but validity data are limited. There are 2 commercial sources of inactivated positive-control CHIKV RNA to be used with purchased primers. The Centers for Disease Control and Prevention provides viral RNA-positive controls and primer and probe nucleotide sequences for real-time RT-PCR testing...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27920175/bridging-the-gap-between-experimental-data-and-model-parameterization-for-chikungunya-virus-transmission-predictions
#10
Rebecca C Christofferson, Christopher N Mores, Helen J Wearing
Chikungunya virus (CHIKV) has experienced 2 major expansion events in the last decade. The most recently emerged sublineage (ECSA-V) was shown to have increased efficiency in a historically secondary vector, Aedes albopictus, leading to speculation that this was a major factor in expansion. Subsequently, a number of experimental studies focused on the vector competence of CHIKV, as well as transmission modeling efforts. Mathematical models have used these data to inform their own investigations, but some have incorrectly parameterized the extrinsic incubation period (EIP) of the mosquitoes, using vector competence data...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27920174/perspectives-and-challenges-in-entomological-risk-assessment-and-vector-control-of-chikungunya
#11
Mawlouth Diallo, Ibrahima Dia, Diawo Diallo, Cheikh Tidiane Diagne, Yamar Ba, Sergio Yactayo
Chikungunya virus (CHIKV) is primarily spread by the Aedes aegypti and Aedes albopictus mosquito vectors. Because there is no licensed vaccine for CHIKV, identifying ways to reduce or eliminate mosquito populations is the most effective strategy to immediately halt transmission to man. Strategies to assess the entomological risk and to control the vector are absolutely crucial to demolishing the rise of CHIKV. This review provides perspectives in entomological risk assessment and vector control, challenges for both, and gaps in knowledge that need to be addressed through rigorous research and multidisciplinary collaborations...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27920173/invasiveness-of-aedes-aegypti-and-aedes-albopictus-and-vectorial-capacity-for-chikungunya-virus
#12
Leon Philip Lounibos, Laura D Kramer
In this review, we highlight biological characteristics of Aedes aegypti and Aedes albopictus, 2 invasive mosquito species and primary vectors of chikungunya virus (CHIKV), that set the tone of these species' invasiveness, vector competence, and vectorial capacity (VC). The invasiveness of both species, as well as their public health threats as vectors, is enhanced by preference for human blood. Vector competence, characterized by the efficiency of an ingested arbovirus to replicate and become infectious in the mosquito, depends largely on vector and virus genetics, and most A...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27920170/epidemiology-of-chikungunya-in-the-americas
#13
Sergio Yactayo, J Erin Staples, Véronique Millot, Laurence Cibrelus, Pilar Ramon-Pardo
Chikungunya virus (CHIKV) emerged in the Americas in late 2013 to cause substantial acute and chronic morbidity. About 1.1 million cases of chikungunya were reported within a year, including severe cases and deaths. The burden of chikungunya is unclear owing to inadequate disease surveillance and underdiagnosis. Virus evolution, globalization, and climate change may further CHIKV spread. No approved vaccine or antiviral therapeutics exist. Early detection and appropriate management could reduce the burden of severe atypical and chronic arthritic disease...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27920169/chikungunya-its-history-in-africa-and-asia-and-its-spread-to-new-regions-in-2013-2014
#14
Herve Zeller, Wim Van Bortel, Bertrand Sudre
Chikungunya virus (CHIKV) is transmitted by Aedes aegypti and Aedes albopictus mosquitoes and causes febrile illness with severe arthralgia in humans. There are 3 circulating CHIKV genotypes, Asia, East/Central/South Africa, and West Africa. CHIKV was first reported in 1953 in Tanzania, and up until the early 2000s, a few outbreaks and sporadic cases of CHIKV were mainly reported in Africa and Asia. However, from 2004 to 2005, a large epidemic spanned from Kenya over to the southwestern Indian Ocean region, India, and Southeast Asia...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27912127/hyperferritinemia-is-a-potential-marker-of-chronic-chikungunya-a-retrospective-study-on-the-island-of-cura%C3%A3-ao-during-the-2014-2015-outbreak
#15
Fatih Anfasa, Lisette Provacia, Corine GeurtsvanKessel, Robert Wever, Izzy Gerstenbluth, Albert D M E Osterhaus, Byron E E Martina
BACKGROUND: Recently Chikungunya virus (CHIKV) outbreaks have been reported in the Carribean. There is no data regarding the outbreak in Curaçao. In addition, to date there is no biomarker that could be used to predict chronic infection. OBJECTIVES: To characterize the first CHIKV outbreak in Curaçao and to identify potential biomarkers for chronic infection. STUDY DESIGN: A serological test and quantitative polymerase chain reaction (qPCR) were used on samples collected in Curaçao to confirm infection...
November 18, 2016: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/27901259/neurological-manifestations-of-chikungunya-and-zika-infections
#16
Talys J Pinheiro, Luis F Guimarães, Marcus Tulius T Silva, Cristiane N Soares
The epidemics of Chikungunya virus (CHIKV) and Zika virus (ZIKV) infections have been considered the most important epidemiological occurrences in the Americas. The clinical picture of CHIKV infection is characterized by high fever, exanthema, myalgia, headaches, and arthralgia. Besides the typical clinical picture of CHIKV, atypical manifestations of neurological complications have been reported: meningo-encephalitis, meningoencephalo-myeloradiculitis, myeloradiculitis, myelitis, myeloneuropathy, Guillain-Barré syndrome and others...
November 2016: Arquivos de Neuro-psiquiatria
https://www.readbyqxmd.com/read/27901124/analysis-of-chikungunya-virus-proteins-reveals-that-non-structural-proteins-nsp2-and-nsp3-exhibit-rna-interference-rnai-suppressor-activity
#17
Kalika Mathur, Abhishek Anand, Sunil Kumar Dubey, Neeti Sanan-Mishra, Raj K Bhatnagar, Sujatha Sunil
RNAi pathway is an antiviral defence mechanism employed by insects that result in degradation of viral RNA thereby curbing infection. Several viruses including flaviviruses encode viral suppressors of RNAi (VSRs) to counteract the antiviral RNAi pathway. Till date, no VSR has been reported in alphaviruses. The present study was undertaken to evaluate chikungunya virus (CHIKV) proteins for RNAi suppressor activity. We systematically analyzed all nine CHIKV proteins for RNAi suppressor activity using Sf21 RNAi sensor cell line based assay...
November 30, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27882301/prolonged-shedding-of-chikungunya-virus-in-semen-and-urine-a-new-perspective-for-diagnosis-and-implications-for-transmission
#18
Antonio Carlos Bandeira, Gubio Soares Campos, Veronica França Diniz Rocha, Bruno Solano de Freitas Souza, Milena Botelho Pereira Soares, Alexsandro Araujo Oliveira, Yara Carvalho de Abreu, Gabriela Sant Ana Menezes, Silvia Ines Sardi
We report the presence of Chikungunya (CHIKV) RNA in the blood, urine and semen during the acute phase of the disease in an adult with a dual infection with Dengue virus type 3. The patient, a 25 yr-old man from Salvador, Brazil, reported a 6-day duration of high fever, arthralgia, myalgia, headache and photophobia.Blood and semen specimens were positive for CHIKV in the first collected samples; semen and urine specimens were positive for CHIKV after 30 days of symptoms onset. DENV-3 RNA was positive in blood specimen when first collected 6 days after the initiation of symptoms...
2016: IDCases
https://www.readbyqxmd.com/read/27864552/immune-mediated-protection-and-pathogenesis-of-chikungunya-virus
#19
REVIEW
Julie M Fox, Michael S Diamond
Chikungunya virus (CHIKV) is a re-emerging alphavirus that causes debilitating acute and chronic arthritis. Infection by CHIKV induces a robust immune response that is characterized by production of type I IFNs, recruitment of innate and adaptive immune cells, and development of neutralizing Abs. Despite this response, chronic arthritis can develop in some individuals, which may be due to a failure to eliminate viral RNA and Ag and/or persistent immune responses that cause chronic joint inflammation. In this review, based primarily on advances from recent studies in mice, we discuss the innate and adaptive immune factors that control CHIKV dissemination and clearance or contribute to pathogenesis...
December 1, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27863885/cell-type-specific-variation-in-the-induction-of-er-stress-and-downstream-events-in-chikungunya-virus-infection
#20
Sarawut Khongwichit, Nitwara Wikan, Bizunesh Abere, Chutima Thepparit, Atichat Kuadkitkan, Sukathida Ubol, Duncan R Smith
Over the last decade infections with the mosquito transmitted chikungunya virus (CHIKV) have become a major worldwide concern, and considerable efforts have been made in understanding the interaction of this virus with the host cell machinery. Studies have documented the induction of the unfolded protein response (UPR), as well as the induction of apoptosis and autophagy in response to CHIKV infection. This study comparatively analysed these three processes in two cell lines, Hela and HepG2. Infection of Hela cells was characterized by activation of the PERK/eIF2α branch of the UPR, the induction of autophagy and early apoptosis, while infection of HepG2 cells was characterized by activation of the IRE/XBP1 branch of the UPR, limited or no activation of autophagy and comparatively later apoptosis...
November 15, 2016: Microbial Pathogenesis
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