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https://www.readbyqxmd.com/read/28448507/detecting-the-impact-of-temperature-on-transmission-of-zika-dengue-and-chikungunya-using-mechanistic-models
#1
Erin A Mordecai, Jeremy M Cohen, Michelle V Evans, Prithvi Gudapati, Leah R Johnson, Catherine A Lippi, Kerri Miazgowicz, Courtney C Murdock, Jason R Rohr, Sadie J Ryan, Van Savage, Marta S Shocket, Anna Stewart Ibarra, Matthew B Thomas, Daniel P Weikel
Recent epidemics of Zika, dengue, and chikungunya have heightened the need to understand the seasonal and geographic range of transmission by Aedes aegypti and Ae. albopictus mosquitoes. We use mechanistic transmission models to derive predictions for how the probability and magnitude of transmission for Zika, chikungunya, and dengue change with mean temperature, and we show that these predictions are well matched by human case data. Across all three viruses, models and human case data both show that transmission occurs between 18-34°C with maximal transmission occurring in a range from 26-29°C...
April 27, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28446607/juvenile-hormone-and-its-receptor-methoprene-tolerant-promote-ribosomal-biogenesis-and-vitellogenesis-in-the-aedes-aegypti-mosquito
#2
Jia-Lin Wang, Tusar T Saha, Yang Zhang, Changyu Zhang, Alexander S Raikhel
Juvenile hormone (JH) controls many biological activities in insects, including development, metamorphosis and reproduction. In the Aedes aegypti mosquito, a vector of Dengue, Yellow fever, Chikungunya and Zika viruses, the metabolic tissue, the fat body, which is an analogue of the vertebrate liver, produces yolk proteins (YPs) for developing oocytes. JH is important for the fat body to acquire competence for YP production. However, the molecular mechanisms of how JH promotes mosquito reproduction are not completely understood...
April 26, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28445723/mosquitoes-transmit-unique-west-nile-virus-populations-during-each-feeding-episode
#3
Nathan D Grubaugh, Joseph R Fauver, Claudia Rückert, James Weger-Lucarelli, Selene Garcia-Luna, Reyes A Murrieta, Alex Gendernalik, Darci R Smith, Doug E Brackney, Gregory D Ebel
Arthropod-borne viruses (arboviruses), such as Zika virus, chikungunya virus, and West Nile virus (WNV), pose continuous threats to emerge and cause large epidemics. Often, these events are associated with novel virus variants optimized for local transmission that first arise as minorities within a host. Thus, the conditions that regulate the frequency of intrahost variants are important determinants of emergence. Here, we describe the dynamics of WNV genetic diversity during its transmission cycle. By temporally sampling saliva from individual mosquitoes, we demonstrate that virus populations expectorated by mosquitoes are highly diverse and unique to each feeding episode...
April 25, 2017: Cell Reports
https://www.readbyqxmd.com/read/28444295/features-of-dengue-and-chikungunya-infections-of-colombian-children-under-24%C3%A2-months-of-age-admitted-to-the-emergency-department
#4
Angel Paternina-Caicedo, Fernando De la Hoz-Restrepo, Fredi Díaz-Quijano, William Caicedo-Torres, María Auxiliadora Badillo-Viloria, Doris Bula-Anichiarico, Nelson Alvis-Guzmán, Salim Mattar, Dagna Constenla, Hernando Pinzón-Redondo
We aimed to assess clinical and laboratory differences between dengue and chikungunya in children <24 months of age in a comparative study. We collected retrospective clinical and laboratory data confirmed by NS1/IgM for dengue for 19 months (1 January 2013 to 17 August 2014). Prospective data for chikungunya confirmed by real-time polymerase chain reaction were collected for 4 months (22 September 2014-14 December 2014). Sensitivity and specificity [with 95% confidence interval (CI)] were reported for each disease diagnosis...
April 21, 2017: Journal of Tropical Pediatrics
https://www.readbyqxmd.com/read/28444003/species-abundance-and-temporal-variation-of-arbovirus-vectors-in-brownsville-texas
#5
Krithika Srinivasan, Beatriz Tapia, Arturo Rodriguez, Robert Wood, Jennifer J Salinas
The recent outbreaks of the dengue fever and West Nile viruses and the looming threats of the Zika and chikungunya viruses highlight the importance of establishing effective, proactive arboviral surveillance in communities at high risk of transmission, such as those on the Texas-Mexico border. Currently, there are no approved human vaccines available for these mosquito-borne diseases, so entomological control and case management are the only known methods for decreasing disease incidence. The principal vectors, which include Culex quinquefasciatus, Aedes aegypti, and Ae...
April 20, 2017: Revista Panamericana de Salud Pública, Pan American Journal of Public Health
https://www.readbyqxmd.com/read/28442104/zika-virus-infection-and-its-emerging-trends-in-southeast-asia
#6
REVIEW
Ahmad Ruzain Salehuddin, Haszianaliza Haslan, Norshalizah Mamikutty, Nurul Hannim Zaidun, Mohamad Fairuz Azmi, Mohamad Mu'izuddin Senin, Syed Baharom Syed Ahmad Fuad, Zar Chi Thent
Zika virus is a mosquito-borne flavivirus that represents a public health emergency at the ongoing epidemic. Previously, this rare virus was limited to sporadic cases in Africa and Asia until its emergence in Brazil, South America in 2015, where it rapidly spread throughout the world. Recently, a high number of cases were reported in Singapore and other Southeast Asia countries. A combination of factors explains the current Zika virus outbreak although it is highly likely that the changes in the climate and high frequency of travelling contribute to the spread of Aedes vector carrying the Zika virus mainly to the tropical climate countries such as the Southeast Asia...
March 2017: Asian Pacific Journal of Tropical Medicine
https://www.readbyqxmd.com/read/28435330/first-case-of-imported-chikungunya-infection-in-croatia-2016
#7
Boris Luksic, Nenad Pandak, Edita Drazic-Maras, Svjetlana Karabuva, Mislav Radic, Andrea Babic-Erceg, Ljubo Barbic, Vladimir Stevanovic, Tatjana Vilibic-Cavlek
In recent years, several European countries reported cases of imported chikungunya infection. We present the first imported clinically manifested chikungunya fever in Croatia. A 27-year-old woman returned to Croatia on 21 March 2016, after she stayed in Costa Rica for two months where she had noticed a mosquito bite on her left forearm. Five days after the mosquito bite she developed severe arthralgias, fever and erythematous papular rash. In next few days symptoms gradually subsided. After ten days she felt better, but arthralgias re-appeared accompanied with morning stiffness...
2017: International Medical Case Reports Journal
https://www.readbyqxmd.com/read/28428662/imaging-findings-in-chikungunya-fever
#8
EDITORIAL
Clarissa Canella
No abstract text is available yet for this article.
March 2017: Radiologia Brasileira
https://www.readbyqxmd.com/read/28428648/ultrasound-of-ankles-in-the-diagnosis-of-complications-of-chikungunya-fever
#9
Roberto Mogami, João Luiz Pereira Vaz, Yêdda de Fátima Barcelos Chagas, Rodrigo Sperling Torezani, André de Almeida Vieira, Ana Célia Baptista Koifman, Yasmin Baptista Barbosa, Mirhelen Mendes de Abreu
OBJECTIVE: To describe the main ultrasound findings of chikungunya fever in the ankle. MATERIALS AND METHODS: This was a cross-sectional observational study involving 52 patients referred to the Hospital Universitário Pedro Ernesto and presenting with clinical and biochemical evidence of chikungunya fever. The examinations were performed by a radiologist with more than 20 years of experience in ultrasound. RESULTS: The predominant gender was female (in 88...
March 2017: Radiologia Brasileira
https://www.readbyqxmd.com/read/28427491/identification-of-a-newly-isolated-getah-virus-in-the-china-laos-border-china
#10
Yuan Yuan Li, Shi Hong Fu, Xiao Fang Guo, Wen Wen Lei, Xiao Long Li, Jing Dong Song, Lei Cao, Xiao Yan Gao, Zhi Lyu, Ying He, Huan Yu Wang, Xiao Jie Ren, Hong Ning Zhou, Gui Qin Wang, Guo Dong Liang
In this study, we isolated a virus strain (YN12031) from specimens of Armigeres subalbatus collected in the China-Laos border. BHK-21 cells infected with YN12031 exhibited an evident cytopathic effect (CPE) 32 h post-infection. The virus particles were spherical, 70 nm in diameter, and enveloped; they also featured surface fibers. Molecular genetic analysis revealed that YN12031 was closely related to alpha viruses such as Chikungunya virus and Sindbis virus, and located in the same clade as MM2021, the prototype of Getahvirus (GETV) isolated in Malaysia in 1955...
March 2017: Biomedical and Environmental Sciences: BES
https://www.readbyqxmd.com/read/28427352/point-of-sampling-detection-of-zika-virus-within-a-multiplexed-kit-capable-of-detecting-dengue-and-chikungunya
#11
Ozlem Yaren, Barry W Alto, Priyanka V Gangodkar, Shatakshi R Ranade, Kunal N Patil, Kevin M Bradley, Zunyi Yang, Nikhil Phadke, Steven A Benner
BACKGROUND: Zika, dengue, and chikungunya are three mosquito-borne viruses having overlapping transmission vectors. They cause diseases having similar symptoms in human patients, but requiring different immediate management steps. Therefore, rapid (< one hour) discrimination of these three viruses in patient samples and trapped mosquitoes is needed. The need for speed precludes any assay that requires complex up-front sample preparation, such as extraction of nucleic acids from the sample...
April 20, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28426114/infectious-diseases-and-migrant-worker-health-in-singapore-a-receiving-country-s-perspective
#12
Sapna P Sadarangani, Poh Lian Lim, Shawn Vasoo
Background.: Approximately 1.4 million migrant workers reside in Singapore, presenting unique infectious disease challenges to both migrants and Singapore. Methods.: A Pubmed, MEDLINE (Ovid), EBSCO Host (Global Health) and Google Scholar search was performed for both peer, non-peer reviewed articles and reports relevant to migrant health in Singapore, published between 1 January 1989 and 1 September 2016. Additional studies were identified from citations within searched articles...
July 1, 2017: Journal of Travel Medicine
https://www.readbyqxmd.com/read/28425959/the-cost-of-arbovirus-disease-prevention-in-europe-area-wide-integrated-control-of-tiger-mosquito-aedes-albopictus-in-emilia-romagna-northern-italy
#13
Massimo Canali, Stefano Rivas-Morales, Philippe Beutels, Claudio Venturelli
Aedes albopictus (tiger mosquito) has become the most invasive mosquito species worldwide, in addition to being a well-known vector of diseases, with a proven capacity for the transmission of chikungunya and dengue viruses in Europe as well as the Zika virus in Africa and in laboratory settings. This research quantifies the cost that needs to be provided by public-health systems for area-wide prevention of arboviruses in Europe. This cost has been calculated by evaluating the expenditure of the plan for Aedes albopictus control set up in the Emilia-Romagna region (Northern Italy) after a chikungunya outbreak occurred in 2007...
April 20, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28424031/yellow-fever-from-angola-and-congo-a-storm-gathers
#14
Qanta A Ahmed, Ziad A Memish
In common with Zika, Chikungunya and Dengue, Yellow Fever (YF) is an arthropod-borne flavivirus. It is transmitted between humans and from monkeys by mosquitoes of the Aedes aegypti (its principal vector), haemogogus and albopictus varieties. Three cycles of transmission may occur: urban; sylvatic; and intermediate. Recently, sub-Saharan Africa has seen the resurgence of this neglected disease. The current YF outbreak in Angola began in December 2015 in the capital Luanda and by October 2016 there had been > 4300 suspected cases, with 376 deaths (case fatality rate = 8...
April 2017: Tropical Doctor
https://www.readbyqxmd.com/read/28423109/effects-of-climatic-and-social-factors-on-dengue-incidence-in-mexican-municipalities-in-the-state-of-veracruz
#15
Grea Litai Moreno-Banda, Horacio Riojas-Rodríguez, Magali Hurtado-Díaz, Rogelio Danis-Lozano, Stephen Joel Rothenberg
Objective: To assess links between the social variables and longer-term El Niño-Southern Oscillation (ENSO) related weather conditions as they relate to the week-to-week changes in dengue incidence at a regional level. Materials and methods: We collected data from 10 municipalities of the Olmeca region in México, over a 10 year period (January 1995 to December 2005). Negative binomial models with distributed lags were adjusted to look for associations between changes in the weekly incidence rate of dengue fever and climate variability...
January 2017: Salud Pública de México
https://www.readbyqxmd.com/read/28422157/detection-of-a-new-pyrethroid-resistance-mutation-v410l-in-the-sodium-channel-of-aedes-aegypti-a-potential-challenge-for-mosquito-control
#16
Khalid Haddi, Hudson V V Tomé, Yuzhe Du, Wilson R Valbon, Yoshiko Nomura, Gustavo F Martins, Ke Dong, Eugênio E Oliveira
The yellow fever mosquito, Aedes aegypti, particularly in Neotropical regions, is the principal vector of dengue, yellow fever, Zika and Chikungunya viruses. Pyrethroids remain one of the most used insecticides to control Aedes mosquitoes, despite the development of pyrethroid resistance in many mosquito populations worldwide. Here, we report a Brazilian strain of A. aegypti with high levels (approximately 100-60,000 fold) of resistance to both type I and type II pyrethroids. We detected two mutations (V410L and F1534C) in the sodium channel from this resistant strain...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28414993/chikungunya-virus-infections-time-to-act-time-to-treat
#17
REVIEW
Rana Abdelnabi, Johan Neyts, Leen Delang
Chikungunya virus (CHIKV) is a re-emerging alphavirus that caused massive outbreaks of Chikungunya fever in several countries and regions in Africa, Asia and more recently in Central and South America. An acute CHIKV infection is usually associated with fever and arthritis and it is rarely fatal. However, 15-60% of patients suffer from chronic polyarthralgia for weeks, months or even for several years after the acute infection. There are currently no vaccines or antivirals available for the prevention or treatment of CHIKV infections...
April 14, 2017: Current Opinion in Virology
https://www.readbyqxmd.com/read/28411063/deploying-dengue-suppressing-wolbachia-robust-models-predict-slow-but-effective-spatial-spread-in-aedes-aegypti
#18
Michael Turelli, Nicholas H Barton
A novel strategy for controlling the spread of arboviral diseases such as dengue, Zika and chikungunya is to transform mosquito populations with virus-suppressing Wolbachia. In general, Wolbachia transinfected into mosquitoes induce fitness costs through lower viability or fecundity. These maternally inherited bacteria also produce a frequency-dependent advantage for infected females by inducing cytoplasmic incompatibility (CI), which kills the embryos produced by uninfected females mated to infected males...
April 11, 2017: Theoretical Population Biology
https://www.readbyqxmd.com/read/28409055/enhanced-surveillance-for-the-third-united-nations-conference-on-small-island-developing-states-apia-samoa-september-2014
#19
Paul White, Salanieta Saketa, Alexis Durand, Saine Vaai-Nielsen, Tile Ah Leong-Lui, Take Naseri, Ailuai Matalima, Filipina Amosa, Alize Mercier, Christelle Lepers, Vjesh Lal, Richard Wojcik, Sheri Lewis, Adam Roth, Yvan Souares, Onofre Edwin Merilles, Damian Hoy
The Ministry of Health in Samoa, in partnership with the Pacific Community, successfully implemented enhanced surveillance for the high-profile Third United Nations Conference on Small Island Developing States held concurrently with the popular local Teuila festival during a widespread chikungunya outbreak in September 2014. Samoa's weekly syndromic surveillance system was expanded to 12 syndromes and 10 sentinel sites from four syndromes and seven sentinel sites; sites included the national hospital, four private health clinics and three national health service clinics...
January 2017: Western Pacific Surveillance and Response Journal: WPSAR
https://www.readbyqxmd.com/read/28408930/a-case-of-initially-undiagnosed-chikungunya-arthritis-developing-into-chronic-phase-in-a-nonendemic-area
#20
Pui Shan Julia Chan, Moon Ho Leung
This case report described a 40-year-old lady presented with fever, headache, arthralgia, myalgia, and impaired liver function after returning from the Philippines. Chikungunya virus (CHIKV) and dengue serology were negative. Eight weeks after initial presentation, she experienced inflammatory polyarthritis mimic rheumatoid arthritis. This time CHIKV-IgM was detected, together with a >4-fold rise of CHIKV-polyvalent-antibody titre. The first CHIKV-IgM negative sample was reexamined and was CHIKV-PCR positive...
2017: Case Reports in Medicine
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