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https://www.readbyqxmd.com/read/28732048/wolbachia-and-dengue-virus-infection-in-the-mosquito-aedes-fluviatilis-diptera-culicidae
#1
Jéssica Barreto Lopes Silva, Debora Magalhães Alves, Vanessa Bottino-Rojas, Thiago Nunes Pereira, Marcos Henrique Ferreira Sorgine, Eric Pearce Caragata, Luciano Andrade Moreira
Dengue represents a serious threat to human health, with billions of people living at risk of the disease. Wolbachia pipientis is a bacterial endosymbiont common to many insect species. Wolbachia transinfections in mosquito disease vectors have great value for disease control given the bacterium's ability to spread into wild mosquito populations, and to interfere with infections of pathogens, such as dengue virus. Aedes fluviatilis is a mosquito with a widespread distribution in Latin America, but its status as a dengue vector has not been clarified...
2017: PloS One
https://www.readbyqxmd.com/read/28729258/complete-genome-sequence-of-a-highly-divergent-dengue-virus-type-2-strain-imported-into-australia-from-sabah-malaysia
#2
Alyssa T Pyke, Bixing Huang, David Warrilow, Peter R Moore, Jamie McMahon, Bruce Harrower
In 2015, a female patient returning to Australia from Sabah, Malaysia, was diagnosed with a suspected sylvatic dengue virus type 2 (DENV-2) infection, becoming the second case of imported highly divergent dengue virus infection recorded in Australia. We describe here the complete genome sequencing of the DENV-2 strain isolated from this patient.
July 20, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28728996/conditions-for-success-of-engineered-underdominance-gene-drive-systems
#3
Matthew P Edgington, Luke S Alphey
Engineered underdominance is one of a number of different gene drive strategies that have been proposed for the genetic control of insect vectors of disease. Here we model a two-locus engineered underdominance based gene drive system that is based on the concept of mutually suppressing lethals. In such a system two genetic constructs are introduced, each possessing a lethal element and a suppressor of the lethal at the other locus. Specifically, we formulate and analyse a population genetics model of this system to assess when different combinations of release strategies (i...
July 17, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28728201/-fever-and-headache-after-a-vacation-in-thailand
#4
Benedikt Schwermer, Daniel Eschle, Constantine Bloch-Infanger
History 50 year-old man with fever and headache starting one week after returning from his vacation in Thailand. His general practitioner prescribed amoxicillin/clavulanic acid, without further analyses to pinpoint the infection. Examinations The examination of cerebro-spinal fluid was crucial for the final diagnosis. Lumbar puncture demonstrated a predominantly mononuclear pleocytosis of 80 cells/µl (< 5) with an elevated protein of 782 mg/l (< 450); glucose and lactate were within normal limits...
July 2017: Deutsche Medizinische Wochenschrift
https://www.readbyqxmd.com/read/28727779/contemporary-status-of-insecticide-resistance-in-the-major-aedes-vectors-of-arboviruses-infecting-humans
#5
REVIEW
Catherine L Moyes, John Vontas, Ademir J Martins, Lee Ching Ng, Sin Ying Koou, Isabelle Dusfour, Kamaraju Raghavendra, João Pinto, Vincent Corbel, Jean-Philippe David, David Weetman
Both Aedes aegytpi and Ae. albopictus are major vectors of 5 important arboviruses (namely chikungunya virus, dengue virus, Rift Valley fever virus, yellow fever virus, and Zika virus), making these mosquitoes an important factor in the worldwide burden of infectious disease. Vector control using insecticides coupled with larval source reduction is critical to control the transmission of these viruses to humans but is threatened by the emergence of insecticide resistance. Here, we review the available evidence for the geographical distribution of insecticide resistance in these 2 major vectors worldwide and map the data collated for the 4 main classes of neurotoxic insecticide (carbamates, organochlorines, organophosphates, and pyrethroids)...
July 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28726595/co-circulation-and-co-infections-of-all-dengue-virus-serotypes-in-hyderabad-india-2014
#6
K Vaddadi, C Gandikota, P K Jain, V S V Prasad, M Venkataramana
The burden of dengue virus infections increased globally during recent years. Though India is considered as dengue hyper-endemic country, limited data are available on disease epidemiology. The present study includes molecular characterization of dengue virus strains occurred in Hyderabad, India, during the year 2014. A total of 120 febrile cases were recruited for this study, which includes only children and 41 were serologically confirmed for dengue positive infections using non-structural (NS1) and/or IgG/IgM ELISA tests...
July 20, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28725041/a-screen-for-novel-hepatitis-c-virus-rdrp-inhibitor-identifies-a-broad-spectrum-antiviral-compound
#7
Abhilasha Madhvi, Smita Hingane, Rajpal Srivastav, Nishant Joshi, Chandru Subramani, Rajagopalan Muthumohan, Renu Khasa, Shweta Varshney, Manjula Kalia, Sudhanshu Vrati, Milan Surjit, C T Ranjith-Kumar
Hepatitis C virus (HCV) is a global pathogen and infects more than 185 million individuals worldwide. Although recent development of direct acting antivirals (DAA) has shown promise in HCV therapy, there is an urgent need for the development of more affordable treatment options. We initiated this study to identify novel inhibitors of HCV through screening of compounds from the National Cancer Institute (NCI) diversity dataset. Using cell-based assays, we identified NSC-320218 as a potent inhibitor against HCV with an EC50 of 2...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28723920/temperature-modulates-dengue-virus-epidemic-growth-rates-through-its-effects-on-reproduction-numbers-and-generation-intervals
#8
Amir S Siraj, Rachel J Oidtman, John H Huber, Moritz U G Kraemer, Oliver J Brady, Michael A Johansson, T Alex Perkins
Epidemic growth rate, r, provides a more complete description of the potential for epidemics than the more commonly studied basic reproduction number, R0, yet the former has never been described as a function of temperature for dengue virus or other pathogens with temperature-sensitive transmission. The need to understand the drivers of epidemics of these pathogens is acute, with arthropod-borne virus epidemics becoming increasingly problematic. We addressed this need by developing temperature-dependent descriptions of the two components of r-R0 and the generation interval-to obtain a temperature-dependent description of r...
July 19, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28723277/ns2a-comprises-a-putative-viroporin-of-dengue-virus-2
#9
Gaurav Shrivastava, Julio García-Cordero, Moisés León-Juárez, Goldie Oza, Jose Tapia-Ramírez, Nicolas Villegas-Sepulveda, Leticia Cedillo-Barrón
No abstract text is available yet for this article.
July 19, 2017: Virulence
https://www.readbyqxmd.com/read/28722631/dengue-virus-coinfection-in-human-immunodeficiency-virus-1-infected-patients-on-the-west-coast-of-mexico
#10
Francisco Espinoza-Gómez, Iván Delgado-Enciso, Salvador Valle-Reyes, Rodolfo Ochoa-Jiménez, Conrado Arechiga-Ramírez, José L Gámez-Arroyo, Roberto Vázquez-Campuzano, Carmen Guzmán-Bracho, Clemente Vásquez, Uriel A López-Lemus
Dengue virus infection in human immunodeficiency virus (HIV)-positive patients is not well studied. Previous reports suggest a transitory inhibition of the HIV-1 viral load, as well as a benign clinical progression of dengue. The follow-up of six HIV-1-infected patients, diagnosed and hospitalized with dengue virus infection in the State of Colima, Mexico, was carried out to analyze the progression of this viral coinfection. The presence of dengue virus serotype 1 was confirmed through molecular tests. No severe complications were observed in any of the patients during dengue virus infection...
June 12, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28722609/differences-in-mortality-and-clinical-manifestations-of-dengue-hemorrhagic-fever-in-taiwan-in-different-years-a-comparison-for-cases-in-2014-and-2015-epidemics
#11
Ko Chang, Chung-Hao Huang, Ing-Kit Lee, Po-Liang Lu, Chun-Yu Lin, Tun-Chieh Chen, Ping-Chang Lai, Hsiao-Cheng Hsieh, Hsin-Liang Yu, Chih-Hsing Hung, Meng-Chieh Wu, Yi-Ying Chin, Chun-Chi Huang, Deng-Chyang Wu, Yen-Hsu Chen
People in southern Taiwan experienced two major dengue outbreaks in 2014 and 2015. The mortality and clinical features were very different between these 2 years. Dengue virus serotype 1 (DENV-1) caused epidemic outbreak in 2014 and DENV-2 was predominant in 2015. The characteristics of dengue hemorrhagic fever (DHF) cases in the 2 years was analyzed. We conducted a retrospective chart review to analyze the clinical and laboratory features of 206 adult patients with DHF in southern Taiwan in 2014 and 2015. The mortality rate of DHF cases in 2015 was higher than that of cases in 2014 (38...
June 12, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28722594/fatal-leptospira-spp-zika-virus-coinfection-puerto-rico-2016
#12
Paige Neaterour, Aidsa Rivera, Renee L Galloway, Myriam Garcia Negrón, Brenda Rivera-Garcia, Tyler M Sharp
Coinfection with pathogens that cause acute febrile illness (AFI) can complicate patient diagnosis and management. This report describes a fatal case of Leptospira spp./Zika virus (ZIKV) coinfection in Puerto Rico. The patient presented with a 5-day history of AFI; reported behavioral risk factors for leptospirosis; was diagnosed with possible leptospirosis, dengue, chikungunya, or ZIKV disease; and received appropriate treatment of leptospirosis and dengue. Following a 3-day hospitalization, the patient died due to acute gastrointestinal hemorrhage, and kidney and liver failure...
June 26, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28721101/survey-of-malaria-and-anti-dengue-virus-igg-among-febrile-hiv-infected-patients-attending-a-tertiary-hospital-in-abuja-nigeria
#13
Jelili Olaide Mustapha, Anthony Uchenna Emeribe, Idris Abdullahi Nasir
BACKGROUND: Dengue and malaria are infections, of great public health concern, especially in sub-Saharan Africa where the burden of HIV infection is high. This study was conducted to determine the seroprevalence of dengue virus IgG antibodies and dengue/malaria coinfection among febrile HIV-infected patients attending the University of Abuja Teaching Hospital, Gwagwalada, Abuja. METHODS: In this cross-sectional study, blood samples from 178 consenting HIV-infected patients receiving antiretroviral therapy were collected and tested for plasmodiasis and anti-Dengue virus IgG using malaria microscopy and ELISA, respectively...
2017: HIV/AIDS: Research and Palliative Care
https://www.readbyqxmd.com/read/28720733/dengue-virus-hijacks-a-noncanonical-oxidoreductase-function-of-a-cellular-oligosaccharyltransferase-complex
#14
David L Lin, Natalia A Cherepanova, Leonia Bozzacco, Margaret R MacDonald, Reid Gilmore, Andrew W Tai
Dengue virus (DENV) is the most common arboviral infection globally, infecting an estimated 390 million people each year. We employed a genome-wide clustered regularly interspaced short palindromic repeat (CRISPR) screen to identify host dependency factors required for DENV propagation and identified the oligosaccharyltransferase (OST) complex as an essential host factor for DENV infection. Mammalian cells express two OSTs containing either STT3A or STT3B. We found that the canonical catalytic function of the OSTs as oligosaccharyltransferases is not necessary for DENV infection, as cells expressing catalytically inactive STT3A or STT3B are able to support DENV propagation...
July 18, 2017: MBio
https://www.readbyqxmd.com/read/28720490/first-record-of-natural-vertical-transmission-of-dengue-virus-in-aedes-aegypti-from-cuba
#15
Gladys Gutiérrez-Bugallo, Rosmari Rodriguez-Roche, Gisell Díaz, Antonio A Vázquez, Mayling Alvarez, Magdalena Rodríguez, Juan A Bisset, Maria G Guzman
While horizontal transmission (human-mosquito-human) of dengue viruses largely determines the epidemiology of the disease, vertical transmission (infected female mosquito- infected offspring) has been suggested as a mechanism that ensures maintenance of the virus during adverse conditions for horizontal transmission to occur. The purpose of this study was to analyze the natural infection of larval stages of Aedes aegypti (Diptera: Culicidae) with the dengue virus (DENV) in Cuba. Here, we report vertical transmission of DENV-3 genotype III in natural populations of Ae...
July 15, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28719335/experimental-infection-with-and-maintenance-of-cell-fusing-agent-virus-flavivirus-in-aedes-aegypti
#16
Maria Angelica Contreras-Gutierrez, Hilda Guzman, Saravanan Thangamani, Nikos Vasilakis, Robert B Tesh
During the past two decades, there has been a dramatic increase in the recognition and characterization of novel insect-specific flaviviruses (ISFVs). Some of these agents are closely related to important mosquito-borne flavivirus pathogens. Results of experimental studies suggest that mosquitoes and mosquito cell cultures infected with some ISFVs are refractory to superinfection with related flavivirus pathogens; and it has been proposed that ISFVs potentially could be used to alter the vector competence of mosquitoes and reduce transmission of specific flavivirus pathogens, such as dengue, West Nile, or Zika viruses...
July 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28719315/analysis-of-clinical-and-laboratory-alterations-related-to-dengue-case-severity-comparison-between-serotypes-2-and-4-in-brazil
#17
Nieli Rodrigues da Costa Faria, Victor Edgar Fiestas Solorzano, Luiz José de Souza, Rita Maria Ribeiro Nogueira, Fernanda de Bruycker-Nogueira, Thaís Chouin-Carneiro, Jaqueline Bastos Santos Simões, Monique da Rocha Queiroz Lima, Luzia Maria de Oliveira Pinto, Claire Fernandes Kubelka, Manoela Heringer, Elzinandes Leal de Azeredo, Flavia Barreto Dos Santos
The increase in severe dengue (SD) cases has caused great impact on public health and has concerned authorities of countries where the disease is endemic and epidemics reach high proportions. The recognition of progression signs of this severe disease during the initial febrile phase can be difficult, since the symptoms are often indistinguishable from other febrile diseases. The aim of this study was to evaluate the clinical manifestations and laboratory findings in patients from two dengue outbreaks and their association with the disease...
July 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28719300/chikungunya-and-zika-virus-cases-detected-against-a-backdrop-of-endemic-dengue-transmission-in-vietnam
#18
Nguyen Than Ha Quyen, Duong Thi Hue Kien, Maia Rabaa, Nguyen Minh Tuan, Tran Thuy Vi, Le Van Tan, Nguyen Thanh Hung, Ha Manh Tuan, Ta Van Tram, Nguyen Le Da Ha, Han Khoi Quang, Nguyen Quoc Doanh, Nguyen Van Vinh Chau, Bridget Wills, Cameron P Simmons
Between 2010 and 2014, four chikungunya and two Zika virus infections were identified among 8,105 febrile children in southern Vietnam. Zika viruses were linked to French Polynesian strains, chikungunya to Cambodian strains. Against a backdrop of endemic dengue transmission, chikungunya and Zika present an additional arboviral disease burden in Vietnam.
July 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28719296/analysis-of-dengue-serotype-4-in-sri-lanka-during-the-2012-2013-dengue-epidemic
#19
Anna Uehara, Hasitha Aravinda Tissera, Champica K Bodinayake, Ananda Amarasinghe, Ajith Nagahawatte, L Gayani Tillekeratne, Jie Cui, Megan E Reller, Paba Palihawadana, Sunethra Gunasena, Aruna Dharshan Desilva, Annelies Wilder-Smith, Duane J Gubler, Christopher W Woods, October M Sessions
The four serotypes of dengue virus (DENV-1, -2, -3, and -4) have had a rapidly expanding geographic range and are now endemic in over 100 tropical and subtropical countries. Sri Lanka has experienced periodic dengue outbreaks since the 1960s, but since 1989 epidemics have become progressively larger and associated with more severe disease. The dominant virus in the 2012 epidemic was DENV-1, but DENV-4 infections were also commonly observed. DENV-4 transmission was first documented in Sri Lanka when it was isolated from a traveler in 1978, but has been comparatively uncommon since dengue surveillance began in the early 1980s...
July 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28718976/low-density-lipopolyprotein-inhibits-flavivirus-acquisition-in-aedes-aegypti
#20
Z L Wagar, M O Tree, M C Mpoy, M J Conway
Aedes aegypti is the primary vector of a number of human pathogens including dengue virus (DENV) and Zika virus (ZIKV). Ae. aegypti acquires these viruses during the processing of bloodmeals obtained from an infected vertebrate host. Vertebrate blood contains a number of factors that have the potential to modify virus acquisition in the mosquito. Interestingly, low density lipopolyprotein (LDL) levels are decreased during severe DENV infection. Accordingly, we hypothesized that LDL is a modifiable factor that can influence flavivirus acquisition in the mosquito...
July 18, 2017: Insect Molecular Biology
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